diff --git a/.github/workflows/general.yml b/.github/workflows/general.yml
index 597e26ad..c110aec9 100644
--- a/.github/workflows/general.yml
+++ b/.github/workflows/general.yml
@@ -39,20 +39,30 @@ jobs:
       - name: Install test dependencies
         run: cd tests && npm ci
 
-      - name: Run unit tests
-        run: npm run test:unit
+      - name: Run unit tests with coverage
+        run: npm run test:unit:coverage
 
       - name: Install Playwright Browsers
         run: cd tests && npx playwright install --with-deps chromium
 
-      - name: Run e2e tests
-        run: npm run test:e2e
+      - name: Run e2e tests with coverage
+        id: e2e
+        run: npm run test:e2e:coverage
 
-      - name: Upload Playwright Report
+      - name: Upload e2e failure artifacts
+        uses: actions/upload-artifact@v4
+        if: ${{ !cancelled() && steps.e2e.outcome == 'failure' }}
+        with:
+          name: e2e-failure-artifacts
+          path: tests/.vitest-attachments/
+          if-no-files-found: ignore
+          retention-days: 14
+
+      - name: Upload coverage reports
         uses: actions/upload-artifact@v4
         if: ${{ !cancelled() }}
         with:
-          name: playwright-report
-          path: tests/e2e/playwright-report/
+          name: coverage-reports
+          path: coverage/
           retention-days: 30
 
diff --git a/.gitignore b/.gitignore
index e0afc50e..440ec3cd 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,5 +3,7 @@ node_modules
 .vscode
 *.tgz
 .DS_Store
-tests/e2e/playwright-report
-tests/e2e/test-results
+tests/.vitest-attachments
+tests/e2e/specs/__screenshots__
+/coverage/
+/temp/
diff --git a/eslint.config.js b/eslint.config.js
index d1e0489c..fc395792 100644
--- a/eslint.config.js
+++ b/eslint.config.js
@@ -6,7 +6,13 @@ import globals from 'globals';
 export default [
   // Global ignores (replaces .eslintignore)
   {
-    ignores: ['node_modules/**', 'dist/**', 'build/**', 'demo/**']
+    ignores: [
+      'node_modules/**',
+      'dist/**',
+      'build/**',
+      'demo/**',
+      'coverage/**'
+    ]
   },
 
   // Base configuration for TypeScript files
diff --git a/package-lock.json b/package-lock.json
index 6b93454b..8735a1f7 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -12,27 +12,28 @@
         "tslib": "^2.8.1"
       },
       "devDependencies": {
+        "@eslint/js": "^10.0.1",
         "@rollup/plugin-node-resolve": "^16.0.3",
-        "@rollup/plugin-terser": "^0.4.4",
-        "@typescript-eslint/eslint-plugin": "^8.48.0",
-        "@typescript-eslint/parser": "^8.48.0",
+        "@rollup/plugin-terser": "^1.0.0",
+        "@typescript-eslint/eslint-plugin": "^8.65.0",
+        "@typescript-eslint/parser": "^8.65.0",
         "chalk": "^5.6.2",
-        "eslint": "^9.39.1",
-        "globals": "^16.5.0",
+        "eslint": "^10.8.0",
+        "globals": "^17.7.0",
         "husky": "^9.1.7",
-        "lint-staged": "^16.2.7",
-        "prettier": "^3.7.1",
-        "rollup": "^4.53.3",
-        "rollup-plugin-license": "^3.6.0",
-        "rollup-plugin-sourcemaps2": "^0.5.4",
+        "lint-staged": "^17.2.0",
+        "prettier": "^3.9.6",
+        "rollup": "^4.62.2",
+        "rollup-plugin-license": "^3.7.1",
+        "rollup-plugin-sourcemaps2": "^0.5.8",
         "shelljs": "^0.10.0",
         "typescript": "^5.9.3"
       }
     },
     "node_modules/@eslint-community/eslint-utils": {
-      "version": "4.9.0",
-      "resolved": "https://registry.npmjs.org/@eslint-community/eslint-utils/-/eslint-utils-4.9.0.tgz",
-      "integrity": "sha512-ayVFHdtZ+hsq1t2Dy24wCmGXGe4q9Gu3smhLYALJrr473ZH27MsnSL+LKUlimp4BWJqMDMLmPpx/Q9R3OAlL4g==",
+      "version": "4.10.1",
+      "resolved": "https://registry.npmjs.org/@eslint-community/eslint-utils/-/eslint-utils-4.10.1.tgz",
+      "integrity": "sha512-cuadcxVFE8sDK6iWJbs8Sn0av2Nrh2QSGQhVlBW9AaAHqHwjWsZHT8LJ4hFGPh7ASBV2deFdM7H/DPjulmh8rg==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
@@ -59,202 +60,129 @@
       }
     },
     "node_modules/@eslint/config-array": {
-      "version": "0.21.1",
-      "resolved": "https://registry.npmjs.org/@eslint/config-array/-/config-array-0.21.1.tgz",
-      "integrity": "sha512-aw1gNayWpdI/jSYVgzN5pL0cfzU02GT3NBpeT/DXbx1/1x7ZKxFPd9bwrzygx/qiwIQiJ1sw/zD8qY/kRvlGHA==",
+      "version": "0.23.5",
+      "resolved": "https://registry.npmjs.org/@eslint/config-array/-/config-array-0.23.5.tgz",
+      "integrity": "sha512-Y3kKLvC1dvTOT+oGlqNQ1XLqK6D1HU2YXPc52NmAlJZbMMWDzGYXMiPRJ8TYD39muD/OTjlZmNJ4ib7dvSrMBA==",
       "dev": true,
       "license": "Apache-2.0",
       "dependencies": {
-        "@eslint/object-schema": "^2.1.7",
+        "@eslint/object-schema": "^3.0.5",
         "debug": "^4.3.1",
-        "minimatch": "^3.1.2"
+        "minimatch": "^10.2.4"
       },
       "engines": {
-        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
-      }
-    },
-    "node_modules/@eslint/config-array/node_modules/brace-expansion": {
-      "version": "1.1.12",
-      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.12.tgz",
-      "integrity": "sha512-9T9UjW3r0UW5c1Q7GTwllptXwhvYmEzFhzMfZ9H7FQWt+uZePjZPjBP/W1ZEyZ1twGWom5/56TF4lPcqjnDHcg==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "balanced-match": "^1.0.0",
-        "concat-map": "0.0.1"
-      }
-    },
-    "node_modules/@eslint/config-array/node_modules/minimatch": {
-      "version": "3.1.2",
-      "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-3.1.2.tgz",
-      "integrity": "sha512-J7p63hRiAjw1NDEww1W7i37+ByIrOWO5XQQAzZ3VOcL0PNybwpfmV/N05zFAzwQ9USyEcX6t3UO+K5aqBQOIHw==",
-      "dev": true,
-      "license": "ISC",
-      "dependencies": {
-        "brace-expansion": "^1.1.7"
-      },
-      "engines": {
-        "node": "*"
+        "node": "^20.19.0 || ^22.13.0 || >=24"
       }
     },
     "node_modules/@eslint/config-helpers": {
-      "version": "0.4.2",
-      "resolved": "https://registry.npmjs.org/@eslint/config-helpers/-/config-helpers-0.4.2.tgz",
-      "integrity": "sha512-gBrxN88gOIf3R7ja5K9slwNayVcZgK6SOUORm2uBzTeIEfeVaIhOpCtTox3P6R7o2jLFwLFTLnC7kU/RGcYEgw==",
+      "version": "0.7.0",
+      "resolved": "https://registry.npmjs.org/@eslint/config-helpers/-/config-helpers-0.7.0.tgz",
+      "integrity": "sha512-DObd/KKUsU+FaFv4PLxSRenpXfQWmPXXP3pPZ6/K1PCrMu2vQpMDMuQe/BqYeoLcz8ro0bVDF1RxOJgfVEdhUw==",
       "dev": true,
       "license": "Apache-2.0",
       "dependencies": {
-        "@eslint/core": "^0.17.0"
+        "@eslint/core": "^1.2.1"
       },
       "engines": {
-        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+        "node": "^20.19.0 || ^22.13.0 || >=24"
       }
     },
     "node_modules/@eslint/core": {
-      "version": "0.17.0",
-      "resolved": "https://registry.npmjs.org/@eslint/core/-/core-0.17.0.tgz",
-      "integrity": "sha512-yL/sLrpmtDaFEiUj1osRP4TI2MDz1AddJL+jZ7KSqvBuliN4xqYY54IfdN8qD8Toa6g1iloph1fxQNkjOxrrpQ==",
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/@eslint/core/-/core-1.2.1.tgz",
+      "integrity": "sha512-MwcE1P+AZ4C6DWlpin/OmOA54mmIZ/+xZuJiQd4SyB29oAJjN30UW9wkKNptW2ctp4cEsvhlLY/CsQ1uoHDloQ==",
       "dev": true,
       "license": "Apache-2.0",
       "dependencies": {
         "@types/json-schema": "^7.0.15"
       },
       "engines": {
-        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
-      }
-    },
-    "node_modules/@eslint/eslintrc": {
-      "version": "3.3.1",
-      "resolved": "https://registry.npmjs.org/@eslint/eslintrc/-/eslintrc-3.3.1.tgz",
-      "integrity": "sha512-gtF186CXhIl1p4pJNGZw8Yc6RlshoePRvE0X91oPGb3vZ8pM3qOS9W9NGPat9LziaBV7XrJWGylNQXkGcnM3IQ==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "ajv": "^6.12.4",
-        "debug": "^4.3.2",
-        "espree": "^10.0.1",
-        "globals": "^14.0.0",
-        "ignore": "^5.2.0",
-        "import-fresh": "^3.2.1",
-        "js-yaml": "^4.1.0",
-        "minimatch": "^3.1.2",
-        "strip-json-comments": "^3.1.1"
-      },
-      "engines": {
-        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
-      },
-      "funding": {
-        "url": "https://opencollective.com/eslint"
-      }
-    },
-    "node_modules/@eslint/eslintrc/node_modules/brace-expansion": {
-      "version": "1.1.12",
-      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.12.tgz",
-      "integrity": "sha512-9T9UjW3r0UW5c1Q7GTwllptXwhvYmEzFhzMfZ9H7FQWt+uZePjZPjBP/W1ZEyZ1twGWom5/56TF4lPcqjnDHcg==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "balanced-match": "^1.0.0",
-        "concat-map": "0.0.1"
-      }
-    },
-    "node_modules/@eslint/eslintrc/node_modules/globals": {
-      "version": "14.0.0",
-      "resolved": "https://registry.npmjs.org/globals/-/globals-14.0.0.tgz",
-      "integrity": "sha512-oahGvuMGQlPw/ivIYBjVSrWAfWLBeku5tpPE2fOPLi+WHffIWbuh2tCjhyQhTBPMf5E9jDEH4FOmTYgYwbKwtQ==",
-      "dev": true,
-      "license": "MIT",
-      "engines": {
-        "node": ">=18"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/sindresorhus"
-      }
-    },
-    "node_modules/@eslint/eslintrc/node_modules/ignore": {
-      "version": "5.3.2",
-      "resolved": "https://registry.npmjs.org/ignore/-/ignore-5.3.2.tgz",
-      "integrity": "sha512-hsBTNUqQTDwkWtcdYI2i06Y/nUBEsNEDJKjWdigLvegy8kDuJAS8uRlpkkcQpyEXL0Z/pjDy5HBmMjRCJ2gq+g==",
-      "dev": true,
-      "license": "MIT",
-      "engines": {
-        "node": ">= 4"
-      }
-    },
-    "node_modules/@eslint/eslintrc/node_modules/minimatch": {
-      "version": "3.1.2",
-      "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-3.1.2.tgz",
-      "integrity": "sha512-J7p63hRiAjw1NDEww1W7i37+ByIrOWO5XQQAzZ3VOcL0PNybwpfmV/N05zFAzwQ9USyEcX6t3UO+K5aqBQOIHw==",
-      "dev": true,
-      "license": "ISC",
-      "dependencies": {
-        "brace-expansion": "^1.1.7"
-      },
-      "engines": {
-        "node": "*"
+        "node": "^20.19.0 || ^22.13.0 || >=24"
       }
     },
     "node_modules/@eslint/js": {
-      "version": "9.39.1",
-      "resolved": "https://registry.npmjs.org/@eslint/js/-/js-9.39.1.tgz",
-      "integrity": "sha512-S26Stp4zCy88tH94QbBv3XCuzRQiZ9yXofEILmglYTh/Ug/a9/umqvgFtYBAo3Lp0nsI/5/qH1CCrbdK3AP1Tw==",
+      "version": "10.0.1",
+      "resolved": "https://registry.npmjs.org/@eslint/js/-/js-10.0.1.tgz",
+      "integrity": "sha512-zeR9k5pd4gxjZ0abRoIaxdc7I3nDktoXZk2qOv9gCNWx3mVwEn32VRhyLaRsDiJjTs0xq/T8mfPtyuXu7GWBcA==",
       "dev": true,
       "license": "MIT",
       "engines": {
-        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+        "node": "^20.19.0 || ^22.13.0 || >=24"
       },
       "funding": {
         "url": "https://eslint.org/donate"
+      },
+      "peerDependencies": {
+        "eslint": "^10.0.0"
+      },
+      "peerDependenciesMeta": {
+        "eslint": {
+          "optional": true
+        }
       }
     },
     "node_modules/@eslint/object-schema": {
-      "version": "2.1.7",
-      "resolved": "https://registry.npmjs.org/@eslint/object-schema/-/object-schema-2.1.7.tgz",
-      "integrity": "sha512-VtAOaymWVfZcmZbp6E2mympDIHvyjXs/12LqWYjVw6qjrfF+VK+fyG33kChz3nnK+SU5/NeHOqrTEHS8sXO3OA==",
+      "version": "3.0.5",
+      "resolved": "https://registry.npmjs.org/@eslint/object-schema/-/object-schema-3.0.5.tgz",
+      "integrity": "sha512-vqTaUEgxzm+YDSdElad6PiRoX4t8VGDjCtt05zn4nU810UIx/uNEV7/lZJ6KwFThKZOzOxzXy48da+No7HZaMw==",
       "dev": true,
       "license": "Apache-2.0",
       "engines": {
-        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+        "node": "^20.19.0 || ^22.13.0 || >=24"
       }
     },
     "node_modules/@eslint/plugin-kit": {
-      "version": "0.4.1",
-      "resolved": "https://registry.npmjs.org/@eslint/plugin-kit/-/plugin-kit-0.4.1.tgz",
-      "integrity": "sha512-43/qtrDUokr7LJqoF2c3+RInu/t4zfrpYdoSDfYyhg52rwLV6TnOvdG4fXm7IkSB3wErkcmJS9iEhjVtOSEjjA==",
+      "version": "0.7.2",
+      "resolved": "https://registry.npmjs.org/@eslint/plugin-kit/-/plugin-kit-0.7.2.tgz",
+      "integrity": "sha512-+CNAzxglkrpNf/kKywqQfk74QjtceuOE7Qm+AF8miRvPF/wmmK5+OJOgVh3AVTT3RP2mH3+FOaxlE5v72owk0A==",
       "dev": true,
       "license": "Apache-2.0",
       "dependencies": {
-        "@eslint/core": "^0.17.0",
+        "@eslint/core": "^1.2.1",
         "levn": "^0.4.1"
       },
       "engines": {
-        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+        "node": "^20.19.0 || ^22.13.0 || >=24"
       }
     },
     "node_modules/@humanfs/core": {
-      "version": "0.19.1",
-      "resolved": "https://registry.npmjs.org/@humanfs/core/-/core-0.19.1.tgz",
-      "integrity": "sha512-5DyQ4+1JEUzejeK1JGICcideyfUbGixgS9jNgex5nqkW+cY7WZhxBigmieN5Qnw9ZosSNVC9KQKyb+GUaGyKUA==",
+      "version": "0.19.2",
+      "resolved": "https://registry.npmjs.org/@humanfs/core/-/core-0.19.2.tgz",
+      "integrity": "sha512-UhXNm+CFMWcbChXywFwkmhqjs3PRCmcSa/hfBgLIb7oQ5HNb1wS0icWsGtSAUNgefHeI+eBrA8I1fxmbHsGdvA==",
       "dev": true,
       "license": "Apache-2.0",
+      "dependencies": {
+        "@humanfs/types": "^0.15.0"
+      },
       "engines": {
         "node": ">=18.18.0"
       }
     },
     "node_modules/@humanfs/node": {
-      "version": "0.16.7",
-      "resolved": "https://registry.npmjs.org/@humanfs/node/-/node-0.16.7.tgz",
-      "integrity": "sha512-/zUx+yOsIrG4Y43Eh2peDeKCxlRt/gET6aHfaKpuq267qXdYDFViVHfMaLyygZOnl0kGWxFIgsBy8QFuTLUXEQ==",
+      "version": "0.16.8",
+      "resolved": "https://registry.npmjs.org/@humanfs/node/-/node-0.16.8.tgz",
+      "integrity": "sha512-gE1eQNZ3R++kTzFUpdGlpmy8kDZD/MLyHqDwqjkVQI0JMdI1D51sy1H958PNXYkM2rAac7e5/CnIKZrHtPh3BQ==",
       "dev": true,
       "license": "Apache-2.0",
       "dependencies": {
-        "@humanfs/core": "^0.19.1",
+        "@humanfs/core": "^0.19.2",
+        "@humanfs/types": "^0.15.0",
         "@humanwhocodes/retry": "^0.4.0"
       },
       "engines": {
         "node": ">=18.18.0"
       }
     },
+    "node_modules/@humanfs/types": {
+      "version": "0.15.0",
+      "resolved": "https://registry.npmjs.org/@humanfs/types/-/types-0.15.0.tgz",
+      "integrity": "sha512-ZZ1w0aoQkwuUuC7Yf+7sdeaNfqQiiLcSRbfI08oAxqLtpXQr9AIVX7Ay7HLDuiLYAaFPu8oBYNq/QIi9URHJ3Q==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "engines": {
+        "node": ">=18.18.0"
+      }
+    },
     "node_modules/@humanwhocodes/module-importer": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/@humanwhocodes/module-importer/-/module-importer-1.0.1.tgz",
@@ -397,18 +325,18 @@
       }
     },
     "node_modules/@rollup/plugin-terser": {
-      "version": "0.4.4",
-      "resolved": "https://registry.npmjs.org/@rollup/plugin-terser/-/plugin-terser-0.4.4.tgz",
-      "integrity": "sha512-XHeJC5Bgvs8LfukDwWZp7yeqin6ns8RTl2B9avbejt6tZqsqvVoWI7ZTQrcNsfKEDWBTnTxM8nMDkO2IFFbd0A==",
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/@rollup/plugin-terser/-/plugin-terser-1.0.0.tgz",
+      "integrity": "sha512-FnCxhTBx6bMOYQrar6C8h3scPt8/JwIzw3+AJ2K++6guogH5fYaIFia+zZuhqv0eo1RN7W1Pz630SyvLbDjhtQ==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "serialize-javascript": "^6.0.1",
+        "serialize-javascript": "^7.0.3",
         "smob": "^1.0.0",
         "terser": "^5.17.4"
       },
       "engines": {
-        "node": ">=14.0.0"
+        "node": ">=20.0.0"
       },
       "peerDependencies": {
         "rollup": "^2.0.0||^3.0.0||^4.0.0"
@@ -420,9 +348,9 @@
       }
     },
     "node_modules/@rollup/pluginutils": {
-      "version": "5.3.0",
-      "resolved": "https://registry.npmjs.org/@rollup/pluginutils/-/pluginutils-5.3.0.tgz",
-      "integrity": "sha512-5EdhGZtnu3V88ces7s53hhfK5KSASnJZv8Lulpc04cWO3REESroJXg73DFsOmgbU2BhwV0E20bu2IDZb3VKW4Q==",
+      "version": "5.4.0",
+      "resolved": "https://registry.npmjs.org/@rollup/pluginutils/-/pluginutils-5.4.0.tgz",
+      "integrity": "sha512-MfPp06CjRLfXQ3wY0R8vJDYBy/MvVcc9OulEfR0B8Iv9ko+GCNaRZ+EpJYFl27LhKsZK0o420sYCRHCjfCgeUg==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
@@ -443,9 +371,9 @@
       }
     },
     "node_modules/@rollup/rollup-android-arm-eabi": {
-      "version": "4.53.3",
-      "resolved": "https://registry.npmjs.org/@rollup/rollup-android-arm-eabi/-/rollup-android-arm-eabi-4.53.3.tgz",
-      "integrity": "sha512-mRSi+4cBjrRLoaal2PnqH82Wqyb+d3HsPUN/W+WslCXsZsyHa9ZeQQX/pQsZaVIWDkPcpV6jJ+3KLbTbgnwv8w==",
+      "version": "4.62.2",
+      "resolved": "https://registry.npmjs.org/@rollup/rollup-android-arm-eabi/-/rollup-android-arm-eabi-4.62.2.tgz",
+      "integrity": "sha512-6o7ZLZK+BeenkZCFNDXqpbjw9bD6nuWonvS/lwQJp7NoVVxm6p3qE7qQ5jGuBjiFsgvqjD8mZAU5oWxTmbOeOg==",
       "cpu": [
         "arm"
       ],
@@ -457,9 +385,9 @@
       ]
     },
     "node_modules/@rollup/rollup-android-arm64": {
-      "version": "4.53.3",
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+      "optional": true,
       "bin": {
         "yaml": "bin.mjs"
       },
       "engines": {
         "node": ">= 14.6"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/eemeli"
       }
     },
     "node_modules/yocto-queue": {
@@ -3248,4 +2664,4 @@
       }
     }
   }
-}
\ No newline at end of file
+}
diff --git a/package.json b/package.json
index 3cd4ec4b..92181e9e 100644
--- a/package.json
+++ b/package.json
@@ -28,9 +28,11 @@
     "build": "node build",
     "test": "npm run lint && cd tests && npm test",
     "test:unit": "cd tests && npm run test:unit",
+    "test:unit:coverage": "cd tests && npm run test:unit:coverage",
     "test:e2e": "cd tests && npm run test:e2e",
+    "test:e2e:coverage": "cd tests && npm run test:e2e:coverage",
     "test:e2e:ui": "cd tests && npm run test:e2e:ui",
-    "test:e2e:debug": "cd tests && npm run test:e2e:debug",
+    "test:coverage": "cd tests && npm run test:coverage",
     "prepack": "npm run build",
     "checkGit": "sh ./uncommited.sh",
     "prepublishOnly": "npm run checkGit && npm run build && npm run test && npm run checkGit"
@@ -39,19 +41,20 @@
     "tslib": "^2.8.1"
   },
   "devDependencies": {
+    "@eslint/js": "^10.0.1",
     "@rollup/plugin-node-resolve": "^16.0.3",
-    "@rollup/plugin-terser": "^0.4.4",
-    "@typescript-eslint/eslint-plugin": "^8.48.0",
-    "@typescript-eslint/parser": "^8.48.0",
+    "@rollup/plugin-terser": "^1.0.0",
+    "@typescript-eslint/eslint-plugin": "^8.65.0",
+    "@typescript-eslint/parser": "^8.65.0",
     "chalk": "^5.6.2",
-    "eslint": "^9.39.1",
-    "globals": "^16.5.0",
+    "eslint": "^10.8.0",
+    "globals": "^17.7.0",
     "husky": "^9.1.7",
-    "lint-staged": "^16.2.7",
-    "prettier": "^3.7.1",
-    "rollup": "^4.53.3",
-    "rollup-plugin-license": "^3.6.0",
-    "rollup-plugin-sourcemaps2": "^0.5.4",
+    "lint-staged": "^17.2.0",
+    "prettier": "^3.9.6",
+    "rollup": "^4.62.2",
+    "rollup-plugin-license": "^3.7.1",
+    "rollup-plugin-sourcemaps2": "^0.5.8",
     "shelljs": "^0.10.0",
     "typescript": "^5.9.3"
   },
@@ -69,4 +72,4 @@
     "javascript",
     "typescript"
   ]
-}
\ No newline at end of file
+}
diff --git a/src/classes/adapter.ts b/src/classes/adapter.ts
index cbd262ff..1aa2c849 100644
--- a/src/classes/adapter.ts
+++ b/src/classes/adapter.ts
@@ -52,6 +52,12 @@ const ALLOWED_METHODS_WHEN_PAUSED = ADAPTER_PROPS_STUB.filter(v => !!v.allowedWh
   v => v.name
 );
 
+const getDisposedResult = (immediate: boolean): AdapterMethodResult => ({
+  immediate,
+  success: false,
+  details: 'Adapter was disposed'
+});
+
 const _has = (obj: unknown, prop: string): boolean =>
   !!obj && typeof obj === 'object' && Object.prototype.hasOwnProperty.call(obj, prop);
 
@@ -398,16 +404,20 @@ export class Adapter<Item = unknown> implements IAdapter<Item> {
   }
 
   dispose(): void {
+    this.disposed = true;
     if (this.relax$) {
+      this.relax$.set(getDisposedResult(false));
       this.relax$.dispose();
     }
+    this.source?.[AdapterPropName.isLoading$]?.set(false);
     if (this.externalContext) {
       this.resetContext();
     }
-    Object.getOwnPropertyNames(this).forEach(prop => {
-      delete (this as Record<string, unknown>)[prop];
-    });
-    this.disposed = true;
+    Object.getOwnPropertyNames(this)
+      .filter(prop => prop !== 'disposed')
+      .forEach(prop => {
+        delete (this as Record<string, unknown>)[prop];
+      });
   }
 
   resetContext(): void {
@@ -569,7 +579,7 @@ export class Adapter<Item = unknown> implements IAdapter<Item> {
     reloadId: string
   ): Promise<AdapterMethodResult> {
     const runCallback = () =>
-      typeof callback === 'function' && reloadId === this.reloadId && callback();
+      !this.disposed && typeof callback === 'function' && reloadId === this.reloadId && callback();
     if (!this.isLoading) {
       runCallback();
     }
@@ -584,11 +594,7 @@ export class Adapter<Item = unknown> implements IAdapter<Item> {
       });
     }).then(immediate => {
       if (this.disposed) {
-        return {
-          immediate,
-          success: false,
-          details: 'Adapter was disposed'
-        };
+        return getDisposedResult(immediate);
       }
       const success = reloadId === this.reloadId;
       this.logger?.log?.(() =>
diff --git a/src/classes/adapter/props.ts b/src/classes/adapter/props.ts
index d53383ef..f859228b 100644
--- a/src/classes/adapter/props.ts
+++ b/src/classes/adapter/props.ts
@@ -274,17 +274,17 @@ export const getDefaultAdapterProps = (): IAdapterProp[] => [
   {
     type: Type.Reactive,
     name: Name.init$,
-    value: new Reactive<boolean>()
+    value: new Reactive<boolean>(false)
   },
   {
     type: Type.Reactive,
     name: Name.isLoading$,
-    value: new Reactive<boolean>()
+    value: new Reactive<boolean>(false)
   },
   {
     type: Type.Reactive,
     name: Name.loopPending$,
-    value: new Reactive<boolean>()
+    value: new Reactive<boolean>(false)
   },
   {
     type: Type.Reactive,
@@ -301,17 +301,17 @@ export const getDefaultAdapterProps = (): IAdapterProp[] => [
   {
     type: Type.Reactive,
     name: Name.bof$,
-    value: new Reactive<boolean>()
+    value: new Reactive<boolean>(false)
   },
   {
     type: Type.Reactive,
     name: Name.eof$,
-    value: new Reactive<boolean>()
+    value: new Reactive<boolean>(false)
   },
   {
     type: Type.Reactive,
     name: Name.paused$,
-    value: new Reactive<boolean>()
+    value: new Reactive<boolean>(false)
   }
 ];
 
diff --git a/src/classes/buffer/defaultSize.ts b/src/classes/buffer/defaultSize.ts
index 3b9d74fe..5fd3d980 100644
--- a/src/classes/buffer/defaultSize.ts
+++ b/src/classes/buffer/defaultSize.ts
@@ -85,7 +85,6 @@ export class DefaultSize {
 
   private recalculateFrequentSize(): void {
     const { oldItems, newItems, removed } = this.recalculation;
-    const oldFrequentSizeCount = this.sizeMap.get(this.frequentSize);
     if (newItems.length) {
       newItems.forEach(({ size }) => this.sizeMap.set(size, (this.sizeMap.get(size) || 0) + 1));
     }
@@ -105,7 +104,7 @@ export class DefaultSize {
     const sorted = [...this.sizeMap.entries()].sort((a, b) => b[1] - a[1]);
     const mostFrequentCount = sorted[0][1];
     const listEqual = sorted.filter(i => i[1] === mostFrequentCount);
-    if (listEqual.length > 1 && listEqual.find(i => i[0] === oldFrequentSizeCount)) {
+    if (listEqual.length > 1 && listEqual.some(([size]) => size === this.frequentSize)) {
       // if there are more than 1 most frequent sizes, but the old one is present
       return;
     }
diff --git a/src/classes/reactive.ts b/src/classes/reactive.ts
index 75a0c6ab..1993b903 100644
--- a/src/classes/reactive.ts
+++ b/src/classes/reactive.ts
@@ -62,10 +62,19 @@ export class Reactive<T> {
   }
 
   once(func: On<T>): Off {
-    const off = this.on(v => {
+    let emitted = false;
+    let off: Off = () => null;
+    off = this.on(v => {
+      if (emitted) {
+        return;
+      }
+      emitted = true;
       off();
       func(v);
     });
+    if (emitted) {
+      off();
+    }
     return off;
   }
 
diff --git a/src/inputs/validation.ts b/src/inputs/validation.ts
index 16d45a25..13796347 100644
--- a/src/inputs/validation.ts
+++ b/src/inputs/validation.ts
@@ -53,15 +53,15 @@ const onInteger = (value: unknown): ValidatedValue => {
 };
 
 const onIntegerUnlimited = (value: unknown): ValidatedValue => {
-  let parsedValue = value;
+  let parsedValue: number;
   const errors = [];
-  value = getNumber(value);
-  if (!Number.isFinite(value)) {
-    parsedValue = value;
+  const numericValue = getNumber(value);
+  if (!Number.isFinite(numericValue)) {
+    parsedValue = numericValue;
   } else {
-    parsedValue = parseInt(String(value), 10);
+    parsedValue = parseInt(String(numericValue), 10);
   }
-  if (value !== parsedValue) {
+  if (numericValue !== parsedValue) {
     errors.push(ValidatorType.integerUnlimited);
   }
   return { value: parsedValue, isSet: true, isValid: !errors.length, errors };
diff --git a/src/processes/fetch.ts b/src/processes/fetch.ts
index 4171e661..4b467af7 100644
--- a/src/processes/fetch.ts
+++ b/src/processes/fetch.ts
@@ -74,18 +74,22 @@ export default class Fetch extends BaseProcessFactory(CommonProcess.fetch) {
     const { index, count } = scroller.state.fetch;
 
     let immediateData, immediateError;
+    let immediateDataReceived = false;
+    let immediateErrorReceived = false;
     let resolve: (value: unknown) => void, reject: (value: unknown) => void;
 
     const done = (data: unknown[]) => {
       if (!resolve) {
         immediateData = data || null;
+        immediateDataReceived = true;
         return;
       }
       resolve(data);
     };
     const fail = (error: unknown) => {
       if (!reject) {
-        immediateError = error || null;
+        immediateError = error;
+        immediateErrorReceived = true;
         return;
       }
       reject(error);
@@ -106,12 +110,12 @@ export default class Fetch extends BaseProcessFactory(CommonProcess.fetch) {
       }
     }
 
-    if (immediateData || immediateError) {
+    if (immediateDataReceived || immediateErrorReceived) {
       // callback case or immediate observable
       return {
-        data: immediateError ? null : immediateData || [],
+        data: immediateErrorReceived ? null : immediateData || [],
         error: immediateError,
-        isError: !!immediateError
+        isError: immediateErrorReceived
       };
     }
 
diff --git a/src/processes/preFetch.ts b/src/processes/preFetch.ts
index 446bab88..0ee5e346 100644
--- a/src/processes/preFetch.ts
+++ b/src/processes/preFetch.ts
@@ -131,7 +131,6 @@ export default class PreFetch extends BaseProcessFactory(CommonProcess.preFetch)
     } else {
       let index = first.indexBuffer;
       let position = first.position;
-      lastIndex = index;
       while (true) {
         lastIndex = index;
         const size = buffer.getSizeByIndex(index);
diff --git a/tests/e2e/fixture/Adapter.ts b/tests/e2e/fixture/Adapter.ts
deleted file mode 100644
index 01c7ab6f..00000000
--- a/tests/e2e/fixture/Adapter.ts
+++ /dev/null
@@ -1,287 +0,0 @@
-import { Page } from '@playwright/test';
-
-/**
- * Adapter accessor class - provides access to adapter methods in browser context
- */
-export class Adapter {
-  constructor(private page: Page) {}
-
-  /**
-   * Wait for the scroller to relax (no pending operations)
-   */
-  async relax() {
-    return await this.page.evaluate(() => {
-      const ds = window.__vscroll__.datasource;
-      if (!ds.adapter) {
-        throw new Error(
-          'Adapter not available. Set useAdapter: true in config.'
-        );
-      }
-      return ds.adapter.relax();
-    });
-  }
-
-  /**
-   * Append items to the end of the dataset
-   */
-  async append(options) {
-    return await this.page.evaluate(opts => {
-      const ds = window.__vscroll__.datasource;
-      if (!ds.adapter) {
-        throw new Error(
-          'Adapter not available. Set useAdapter: true in config.'
-        );
-      }
-      return ds.adapter.append(opts);
-    }, options);
-  }
-
-  /**
-   * Prepend items to the beginning of the dataset
-   */
-  async prepend(options) {
-    return await this.page.evaluate(opts => {
-      const ds = window.__vscroll__.datasource;
-      if (!ds.adapter) {
-        throw new Error(
-          'Adapter not available. Set useAdapter: true in config.'
-        );
-      }
-      return ds.adapter.prepend(opts);
-    }, options);
-  }
-
-  /**
-   * Reload the dataset
-   */
-  async reload(reloadIndex) {
-    return await this.page.evaluate(index => {
-      const ds = window.__vscroll__.datasource;
-      if (!ds.adapter) {
-        throw new Error(
-          'Adapter not available. Set useAdapter: true in config.'
-        );
-      }
-      return ds.adapter.reload(index);
-    }, reloadIndex);
-  }
-
-  /**
-   * Reset the scroller to initial state
-   */
-  async reset(options) {
-    return await this.page.evaluate(opts => {
-      const ds = window.__vscroll__.datasource;
-      if (!ds.adapter) {
-        throw new Error(
-          'Adapter not available. Set useAdapter: true in config.'
-        );
-      }
-      return ds.adapter.reset(opts);
-    }, options);
-  }
-
-  /**
-   * Remove items from the dataset
-   */
-  async remove(options) {
-    const predicateStr = options.predicate.toString();
-    return await this.page.evaluate(
-      ({ predicateStr, increase }) => {
-        const ds = window.__vscroll__.datasource;
-        if (!ds.adapter) {
-          throw new Error(
-            'Adapter not available. Set useAdapter: true in config.'
-          );
-        }
-        const predicate = eval(`(${predicateStr})`);
-        return ds.adapter.remove({ predicate, increase });
-      },
-      { predicateStr, increase: options.increase }
-    );
-  }
-
-  /**
-   * Insert items at a specific position
-   */
-  async insert(options) {
-    return await this.page.evaluate(opts => {
-      const ds = window.__vscroll__.datasource;
-      if (!ds.adapter) {
-        throw new Error(
-          'Adapter not available. Set useAdapter: true in config.'
-        );
-      }
-      return ds.adapter.insert(opts);
-    }, options);
-  }
-
-  /**
-   * Replace items in the dataset
-   */
-  async replace(options) {
-    const predicateStr = options.predicate.toString();
-    return await this.page.evaluate(
-      ({ predicateStr, items }) => {
-        const ds = window.__vscroll__.datasource;
-        if (!ds.adapter) {
-          throw new Error(
-            'Adapter not available. Set useAdapter: true in config.'
-          );
-        }
-        const predicate = eval(`(${predicateStr})`);
-        return ds.adapter.replace({ predicate, items });
-      },
-      { predicateStr, items: options.items }
-    );
-  }
-
-  /**
-   * Update items in the dataset
-   */
-  async update(options) {
-    const predicateStr = options.predicate.toString();
-    return await this.page.evaluate(predicateStr => {
-      const ds = window.__vscroll__.datasource;
-      if (!ds.adapter) {
-        throw new Error(
-          'Adapter not available. Set useAdapter: true in config.'
-        );
-      }
-      const predicate = eval(`(${predicateStr})`);
-      return ds.adapter.update({ predicate });
-    }, predicateStr);
-  }
-
-  /**
-   * Clip the dataset (remove items outside visible range)
-   */
-  async clip(options) {
-    return await this.page.evaluate(opts => {
-      const ds = window.__vscroll__.datasource;
-      if (!ds.adapter) {
-        throw new Error(
-          'Adapter not available. Set useAdapter: true in config.'
-        );
-      }
-      return ds.adapter.clip(opts);
-    }, options);
-  }
-
-  /**
-   * Check the dataset consistency
-   */
-  async check() {
-    return await this.page.evaluate(() => {
-      const ds = window.__vscroll__.datasource;
-      if (!ds.adapter) {
-        throw new Error(
-          'Adapter not available. Set useAdapter: true in config.'
-        );
-      }
-      return ds.adapter.check();
-    });
-  }
-
-  /**
-   * Fix scroll position
-   */
-  async fix(options) {
-    return await this.page.evaluate(opts => {
-      const ds = window.__vscroll__.datasource;
-      if (!ds.adapter) {
-        throw new Error(
-          'Adapter not available. Set useAdapter: true in config.'
-        );
-      }
-      return ds.adapter.fix(opts);
-    }, options);
-  }
-
-  /**
-   * Get adapter properties (as getters to match IAdapter interface)
-   */
-  get isLoading() {
-    return this.page.evaluate(() => {
-      const ds = window.__vscroll__.datasource;
-      if (!ds.adapter) {
-        throw new Error(
-          'Adapter not available. Set useAdapter: true in config.'
-        );
-      }
-      return ds.adapter.isLoading;
-    });
-  }
-
-  get bof() {
-    return this.page.evaluate(() => {
-      const ds = window.__vscroll__.datasource;
-      if (!ds.adapter) {
-        throw new Error(
-          'Adapter not available. Set useAdapter: true in config.'
-        );
-      }
-      return ds.adapter.bof;
-    });
-  }
-
-  get eof() {
-    return this.page.evaluate(() => {
-      const ds = window.__vscroll__.datasource;
-      if (!ds.adapter) {
-        throw new Error(
-          'Adapter not available. Set useAdapter: true in config.'
-        );
-      }
-      return ds.adapter.eof;
-    });
-  }
-
-  get itemsCount() {
-    return this.page.evaluate(() => {
-      const ds = window.__vscroll__.datasource;
-      if (!ds.adapter) {
-        throw new Error(
-          'Adapter not available. Set useAdapter: true in config.'
-        );
-      }
-      return ds.adapter.itemsCount;
-    });
-  }
-
-  get firstVisible() {
-    return this.page.evaluate(() => {
-      const ds = window.__vscroll__.datasource;
-      if (!ds.adapter) {
-        throw new Error(
-          'Adapter not available. Set useAdapter: true in config.'
-        );
-      }
-      return ds.adapter.firstVisible;
-    });
-  }
-
-  get lastVisible() {
-    return this.page.evaluate(() => {
-      const ds = window.__vscroll__.datasource;
-      if (!ds.adapter) {
-        throw new Error(
-          'Adapter not available. Set useAdapter: true in config.'
-        );
-      }
-      return ds.adapter.lastVisible;
-    });
-  }
-
-  get bufferInfo() {
-    return this.page.evaluate(() => {
-      const ds = window.__vscroll__.datasource;
-      if (!ds.adapter) {
-        throw new Error(
-          'Adapter not available. Set useAdapter: true in config.'
-        );
-      }
-      return ds.adapter.bufferInfo;
-    });
-  }
-}
diff --git a/tests/e2e/fixture/Scroller.ts b/tests/e2e/fixture/Scroller.ts
deleted file mode 100644
index 7fd61cdf..00000000
--- a/tests/e2e/fixture/Scroller.ts
+++ /dev/null
@@ -1,110 +0,0 @@
-import { Page } from '../types';
-import { Direction as DirectionEnum } from '../../../src/inputs/common';
-
-/**
- * Direction enum (inline, no import from vscroll source)
- * This avoids TypeScript compilation issues when loading e2e tests
- */
-export const Direction = {
-  forward: 'forward',
-  backward: 'backward'
-} as const;
-
-export type DirectionType = (typeof Direction)[keyof typeof Direction];
-
-/**
- * Scroller accessor class - provides access to scroller properties in browser context
- */
-export class Scroller {
-  constructor(private page: Page) {}
-
-  get settings() {
-    const page = this.page;
-    return {
-      get startIndex(): Promise<number> {
-        return page.evaluate(() => {
-          return window.__vscroll__.workflow.scroller.settings.startIndex;
-        });
-      },
-      get bufferSize(): Promise<number> {
-        return page.evaluate(() => {
-          return window.__vscroll__.workflow.scroller.settings.bufferSize;
-        });
-      },
-      get padding(): Promise<number> {
-        return page.evaluate(() => {
-          return window.__vscroll__.workflow.scroller.settings.padding;
-        });
-      },
-      get horizontal(): Promise<boolean> {
-        return page.evaluate(() => {
-          return window.__vscroll__.workflow.scroller.settings.horizontal;
-        });
-      }
-    };
-  }
-
-  get buffer() {
-    const page = this.page;
-    return {
-      get size(): Promise<number> {
-        return page.evaluate(() => {
-          return window.__vscroll__.workflow.scroller.buffer.size;
-        });
-      },
-      get defaultSize(): Promise<number> {
-        return page.evaluate(() => {
-          return window.__vscroll__.workflow.scroller.buffer.defaultSize;
-        });
-      },
-      getEdgeVisibleItem: async (direction: DirectionType) => {
-        return await page.evaluate(dir => {
-          const workflow = window.__vscroll__.workflow;
-          const item = workflow.scroller.buffer.getEdgeVisibleItem(
-            dir as DirectionEnum
-          );
-          return item ? { $index: item.$index, data: item.data } : null;
-        }, direction);
-      }
-    };
-  }
-
-  get viewport() {
-    const page = this.page;
-    return {
-      getSize: async () => {
-        return await page.evaluate(() => {
-          return window.__vscroll__.workflow.scroller.viewport.getSize();
-        });
-      },
-      getScrollableSize: async () => {
-        return await page.evaluate(() => {
-          return window.__vscroll__.workflow.scroller.viewport.getScrollableSize();
-        });
-      },
-      get scrollPosition(): Promise<number> {
-        return page.evaluate(() => {
-          return window.__vscroll__.workflow.scroller.viewport.scrollPosition;
-        });
-      },
-      paddings: {
-        [Direction.forward]: {
-          get size(): Promise<number> {
-            return page.evaluate(() => {
-              return window.__vscroll__.workflow.scroller.viewport.paddings
-                .forward.size;
-            });
-          }
-        },
-        [Direction.backward]: {
-          get size(): Promise<number> {
-            return page.evaluate(() => {
-              return window.__vscroll__.workflow.scroller.viewport.paddings
-                .backward.size;
-            });
-          }
-        }
-      }
-    };
-  }
-}
diff --git a/tests/e2e/fixture/VScrollFixture.ts b/tests/e2e/fixture/VScrollFixture.ts
deleted file mode 100644
index faa594be..00000000
--- a/tests/e2e/fixture/VScrollFixture.ts
+++ /dev/null
@@ -1,445 +0,0 @@
-import * as path from 'path';
-import { Scroller, Direction, type DirectionType } from './Scroller.js';
-import { Adapter } from './Adapter.js';
-import { VScrollFixtureConfig, Page, Item } from '../types';
-
-export { Direction, type DirectionType };
-
-export class VScrollFixture {
-  page: Page;
-  private config: VScrollFixtureConfig;
-  readonly scroller: Scroller;
-  readonly adapter: Adapter;
-
-  constructor(page: Page, config: VScrollFixtureConfig) {
-    this.page = page;
-    this.config = config;
-    this.scroller = new Scroller(page);
-    this.adapter = new Adapter(page);
-  }
-
-  static async create(
-    page: Page,
-    config: VScrollFixtureConfig
-  ): Promise<VScrollFixture> {
-    const fixture = new VScrollFixture(page, config);
-    await fixture.mount();
-    return fixture;
-  }
-
-  /**
-   * Mount vscroll in browser (POC pattern)
-   */
-  async mount(): Promise<void> {
-    const page = this.page;
-
-    // 1. Go to blank page
-    await page.goto('about:blank');
-
-    // 2. Load vscroll UMD bundle
-    const vscrollPath = path.join(
-      process.cwd(),
-      '..',
-      'dist',
-      'bundles',
-      'vscroll.umd.js'
-    );
-    await page.addScriptTag({ path: vscrollPath });
-
-    // 3. Add global styles FIRST (separate evaluate call to ensure styles are processed)
-    const templateSettings = this.config.templateSettings || {};
-    if (templateSettings.horizontal || templateSettings.itemHeight) {
-      await page.addStyleTag({
-        content: templateSettings.horizontal
-          ? `
-            #viewport {
-              white-space: nowrap;
-            }
-            #viewport div {
-              display: inline-block;
-            }
-            #vscroll [data-sid] {
-              width: ${templateSettings.itemWidth || 100}px;
-              overflow-x: hidden;
-            }
-          `
-          : `
-            #vscroll [data-sid] {
-              height: ${templateSettings.itemHeight}px;
-              overflow-y: hidden;
-            }
-          `
-      });
-    }
-
-    // 4. Create viewport and vscroll element (after styles are loaded)
-    await page.evaluate(settings => {
-      // Handle windowViewport mode (use document.body as viewport)
-      const useWindowViewport =
-        settings.noViewportClass && settings.viewportHeight === 0;
-
-      // Create header if specified
-      if (settings.headerHeight) {
-        const header = document.createElement('div');
-        header.id = 'header';
-        header.style.height = `${settings.headerHeight}px`;
-        header.style.width = '100%';
-        header.style.backgroundColor = 'yellow';
-        document.body.appendChild(header);
-      }
-
-      const viewport = document.createElement('div');
-      viewport.id = 'viewport';
-
-      if (useWindowViewport) {
-        // For windowViewport: use body as viewport, no fixed dimensions
-        document.body.style.margin = '0';
-        document.body.style.padding = '0';
-        document.body.style.overflow = settings.horizontal ? 'hidden' : 'auto';
-      } else if (settings.horizontal) {
-        viewport.style.width = `${settings.viewportWidth || 300}px`;
-        viewport.style.height = '100%';
-        viewport.style.overflowX = 'scroll'; // Always scroll, not auto
-        viewport.style.overflowY = 'hidden';
-      } else {
-        viewport.style.height = `${settings.viewportHeight || 200}px`;
-        viewport.style.width = '100%';
-        viewport.style.overflowY = 'scroll'; // Always scroll, not auto
-        viewport.style.overflowX = 'hidden';
-      }
-
-      document.body.appendChild(viewport);
-
-      // Create vscroll element with padding elements
-      const vscrollEl = document.createElement('div');
-      vscrollEl.id = 'vscroll';
-
-      const backwardPadding = document.createElement('div');
-      backwardPadding.setAttribute('data-padding-backward', '');
-      vscrollEl.appendChild(backwardPadding);
-
-      const forwardPadding = document.createElement('div');
-      forwardPadding.setAttribute('data-padding-forward', '');
-      vscrollEl.appendChild(forwardPadding);
-
-      viewport.appendChild(vscrollEl);
-    }, templateSettings);
-
-    // 5. Initialize vscroll workflow
-    await this.initializeWorkflow();
-  }
-
-  /**
-   * Initialize vscroll workflow in browser
-   * Supports two patterns:
-   * 1. Plain object datasource (simple tests)
-   * 2. Datasource class with adapter (adapter tests)
-   */
-  private async initializeWorkflow(): Promise<void> {
-    const { datasource, templateFn, noAdapter } = this.config;
-
-    // Serialize functions and config
-    const datasourceGetStr = datasource.get ? datasource.get.toString() : null;
-    const datasourceSettings = datasource.settings || {};
-    // Add default devSettings for all e2e tests:
-    // debug enabled, colors disabled, immediateLog disabled (to store logs in logger for retrieval on test failure)
-    const datasourceDevSettings = {
-      debug: true,
-      logProcessRun: false,
-      immediateLog: true,
-      logColor: false,
-      ...(datasource.devSettings || {})
-    };
-    const templateFnStr = templateFn
-      ? templateFn.toString()
-      : '(item) => `<div class="item">${item.$index}: ${item.data.text || ""}</div>`';
-
-    await this.page.evaluate(
-      ({
-        datasourceGetStr,
-        datasourceSettings,
-        datasourceDevSettings,
-        templateFnStr,
-        noAdapter
-      }) => {
-        const VScroll = window.VScroll;
-
-        // Parse configs
-        const datasourceGet = eval(`(${datasourceGetStr})`);
-        const templateFn = eval(`(${templateFnStr})`);
-
-        // Renderer
-        const processItems = (
-          newItems: Item<unknown>[],
-          oldItems: Item<unknown>[]
-        ) => {
-          // Remove elements not present
-          oldItems
-            .filter(item => !newItems.includes(item))
-            .forEach(item => item.element.remove());
-
-          // Create and insert new elements
-          const elements = [];
-          const vscrollEl = document.getElementById('vscroll')!;
-          let beforeElement = vscrollEl.querySelector('[data-padding-forward]');
-
-          for (let i = newItems.length - 1; i >= 0; i--) {
-            if (oldItems.includes(newItems[i])) {
-              if (!elements.length) {
-                beforeElement = newItems[i].element;
-                continue;
-              } else {
-                break;
-              }
-            }
-
-            // Create element
-            const item = newItems[i];
-            const element = document.createElement('div');
-            element.setAttribute('data-sid', String(item.$index));
-
-            if (item.invisible) {
-              element.style.position = 'fixed';
-              element.style.top = '-99px';
-            }
-
-            element.innerHTML = templateFn(item);
-
-            item.element = element;
-            elements.unshift(element);
-          }
-
-          elements.forEach(elt =>
-            beforeElement!.insertAdjacentElement('beforebegin', elt)
-          );
-        };
-
-        // Create datasource (plain object or Datasource class)
-        let datasourceInstance;
-
-        if (noAdapter) {
-          // Pattern 1: Plain object (no adapter)
-          datasourceInstance = {
-            get: datasourceGet,
-            settings: datasourceSettings,
-            devSettings: datasourceDevSettings
-          };
-        } else {
-          // Pattern 2: Create Datasource class with adapter support
-          const Datasource = VScroll.makeDatasource();
-          datasourceInstance = new Datasource({
-            get: datasourceGet,
-            settings: datasourceSettings,
-            devSettings: datasourceDevSettings
-          });
-        }
-
-        // Expose for testing
-        window.__vscroll__ = {
-          workflow: undefined, // Will be set by createWorkflowFactory()
-          makeScroller: undefined,
-          datasource: datasourceInstance,
-          Direction: { forward: 'forward', backward: 'backward' }
-        };
-
-        // Factory to create workflow factory with fresh oldItems closure
-        const workflowFactory = () => {
-          let oldItems: Item<unknown>[] = [];
-
-          const workflowParams = {
-            consumer: { name: 'vscroll-e2e', version: '1.0.0' },
-            element: document.getElementById('vscroll'),
-            datasource: datasourceInstance,
-            run: (newItems: unknown[]) => {
-              const items = newItems as Item<unknown>[];
-              if (!items.length && !oldItems.length) {
-                return;
-              }
-              processItems(items, oldItems);
-              oldItems = items;
-            }
-          };
-
-          return () => new VScroll.Workflow(workflowParams);
-        };
-
-        // Creates Workflow with fresh closure and updates window.__vscroll__.workflow
-        const makeScroller = () =>
-          (window.__vscroll__.workflow = workflowFactory()());
-        window.__vscroll__.makeScroller = makeScroller;
-      },
-      {
-        datasourceGetStr,
-        datasourceSettings,
-        datasourceDevSettings,
-        templateFnStr,
-        noAdapter: !!noAdapter
-      }
-    );
-
-    // Run onBefore hook
-    // Workflow is ready but not initialized
-    // Datasource is instantiated, so subscriptions can be made
-    if (this.config.onBefore) {
-      await this.config.onBefore(this.page);
-    }
-
-    // Create initial workflow
-    await this.page.evaluate(() => window.__vscroll__.makeScroller?.());
-  }
-
-  /**
-   * Access to workflow in browser
-   */
-  get workflow() {
-    const page = this.page;
-    return {
-      get cyclesDone(): Promise<number> {
-        return page.evaluate(() => window.__vscroll__.workflow.cyclesDone);
-      },
-      get innerLoopCount(): Promise<number> {
-        return page.evaluate(
-          () => window.__vscroll__.workflow.scroller.state.cycle.innerLoop.total
-        );
-      }
-    };
-  }
-
-  /**
-   * Scroll to a specific position and wait for Scroller to relax.
-   * @param position - The position to scroll to
-   * @param options.noRelax - If true, no wait for relaxation
-   */
-  async scrollTo(
-    position: number,
-    options: { noRelax?: boolean } = {}
-  ): Promise<void> {
-    return this.page.evaluate(
-      async ({ position, options }) => {
-        const workflow = window.__vscroll__.workflow;
-        const viewport = workflow.scroller.viewport;
-        const adapter = workflow.scroller.datasource.adapter;
-        const cyclesDone = workflow.cyclesDone;
-        const positionBefore = viewport.scrollPosition;
-        await adapter.fix({ scrollPosition: position });
-        if (options?.noRelax || viewport.scrollPosition === positionBefore) {
-          return;
-        }
-        if (!adapter.isLoading) {
-          // The new workflow cycle should run and complete
-          while (workflow.cyclesDone === cyclesDone) {
-            await new Promise(resolve => setTimeout(resolve));
-          }
-        }
-      },
-      { position, options }
-    );
-  }
-
-  /**
-   * Scroll to max position
-   */
-  async scrollMax(options?: { noRelax?: boolean }): Promise<void> {
-    return this.scrollTo(Infinity, options);
-  }
-
-  /**
-   * Scroll to min position
-   */
-  async scrollMin(options?: { noRelax?: boolean }): Promise<void> {
-    return this.scrollTo(0, options);
-  }
-
-  /**
-   * Get all rendered elements
-   */
-  async getElements(): Promise<HTMLElement[]> {
-    return (await this.page.$$('[data-sid]')) as unknown as HTMLElement[];
-  }
-
-  /**
-   * Get element index
-   */
-  async getElementIndex(element: HTMLElement): Promise<number> {
-    return await this.page.evaluate(el => {
-      return parseInt(el.getAttribute('data-sid') || '0', 10);
-    }, element);
-  }
-
-  /**
-   * Check element content by index
-   */
-  async checkElementContentByIndex(index: number): Promise<boolean> {
-    return await this.page.evaluate(idx => {
-      const elements = Array.from(document.querySelectorAll('[data-sid]'));
-      const element = elements.find(
-        el => el.getAttribute('data-sid') === String(idx)
-      );
-      return element
-        ? element.textContent?.includes(String(idx)) || false
-        : false;
-    }, index);
-  }
-
-  /**
-   * Wait for the workflow cycle to complete
-   * @param cycle - The cycle to wait for, if not provided, wait for the current cycle to complete
-   * @returns A promise that resolves when the workflow has finished current or provided cycle
-   */
-  async relaxNext(cycle: number): Promise<void> {
-    return this.page.evaluate(
-      ({ cycle }: { cycle: number }) =>
-        new Promise<void>(resolve => {
-          const workflow = window.__vscroll__.workflow;
-          const ds = workflow.scroller.datasource;
-          const cycleToComplete =
-            typeof cycle === 'number' ? cycle - 1 : workflow.cyclesDone;
-
-          // If already loading, we can wait for the adapter is relaxed
-          if (ds?.adapter?.isLoading) {
-            return ds.adapter.relax().then(() => resolve());
-          }
-
-          // Otherwise, wait for the given cycle to complete
-          const waitForCycle = async () => {
-            if (workflow.cyclesDone > cycleToComplete && ds?.adapter) {
-              await ds.adapter.relax();
-              return resolve();
-            } else {
-              requestAnimationFrame(waitForCycle);
-            }
-          };
-
-          waitForCycle();
-        }),
-      { cycle }
-    );
-  }
-
-  /**
-   * Dispose
-   */
-  async dispose(): Promise<void> {
-    await this.page.evaluate(() => {
-      window.__vscroll__?.workflow?.dispose();
-      document.querySelector('#viewport')?.remove();
-    });
-  }
-
-  /**
-   * Recreate the scroller
-   * Disposes the current workflow, resets the viewport, and creates a new workflow
-   */
-  async recreateScroller(): Promise<void> {
-    await this.page.evaluate(() => {
-      window.__vscroll__.workflow.dispose();
-
-      // Reset vscroll element to initial state
-      const vscroll = document.getElementById('vscroll') as HTMLElement;
-      vscroll.innerHTML =
-        '<div data-padding-backward></div><div data-padding-forward></div>';
-
-      window.__vscroll__.makeScroller!();
-    });
-  }
-}
diff --git a/tests/e2e/fixture/after-each-logs.ts b/tests/e2e/fixture/after-each-logs.ts
deleted file mode 100644
index cd6bed1a..00000000
--- a/tests/e2e/fixture/after-each-logs.ts
+++ /dev/null
@@ -1,62 +0,0 @@
-import type { Page, TestInfo } from '@playwright/test';
-
-/**
- * afterEachLogs handler that retrieves and prints vscroll debug logs when tests fail.
- *
- * With immediateLog: false, logs are stored in workflow.scroller.logger
- * and can be retrieved from the browser context.
- *
- * Usage:
- * ```typescript
- * import { afterEachLogs } from '../fixture/after-each-logs.js';
- *
- * test.afterEach(afterEachLogs);
- * ```
- */
-export async function afterEachLogs(
-  { page }: { page: Page },
-  testInfo: TestInfo
-): Promise<void> {
-  // Only process if test failed
-  if (testInfo.status !== testInfo.expectedStatus) {
-    // Get logs from vscroll logger
-    const logs = await page
-      .evaluate(() => {
-        const vscroll = window.__vscroll__;
-        if (!vscroll?.workflow?.scroller?.logger) {
-          return [];
-        }
-
-        const logger = vscroll.workflow.scroller.logger;
-        // Access private logs array (stored when immediateLog: false)
-        const logArray = logger.getLogs() || [];
-
-        // Format logs similar to console output
-        return logArray.map(args => {
-          return args
-            .map(arg => {
-              if (typeof arg === 'object' && arg !== null) {
-                return JSON.stringify(arg);
-              }
-              return String(arg);
-            })
-            .join(' ');
-        });
-      })
-      .catch(() => [] as string[]);
-
-    if (logs.length > 0) {
-      const testName = testInfo.titlePath.join(' › ');
-      console.log('\n' + '='.repeat(80));
-      console.log(`VSCROLL DEBUG LOGS (test failed): ${testName}`);
-      console.log('='.repeat(80));
-      logs.forEach(log => console.log(log));
-      console.log('='.repeat(80) + '\n');
-
-      await testInfo.attach('vscroll-debug-logs', {
-        body: logs.join('\n'),
-        contentType: 'text/plain'
-      });
-    }
-  }
-}
diff --git a/tests/e2e/fixture/create-fixture.ts b/tests/e2e/fixture/create-fixture.ts
deleted file mode 100644
index db1b07fa..00000000
--- a/tests/e2e/fixture/create-fixture.ts
+++ /dev/null
@@ -1,83 +0,0 @@
-import { VScrollFixture } from './VScrollFixture.js';
-import { Page, IDatasource, ITestConfig } from 'types/index.js';
-
-type FixtureParams = {
-  page: Page;
-  config: ITestConfig;
-};
-
-export const createFixture = async ({
-  page,
-  config
-}: FixtureParams): Promise<VScrollFixture> => {
-  const { templateSettings, templateFn } = config;
-
-  const datasource: IDatasource = {
-    get: config.datasourceGet,
-    settings: config.datasourceSettings,
-    devSettings: config.datasourceDevSettings
-  };
-
-  const fixture = await VScrollFixture.create(page, {
-    datasource,
-    templateSettings,
-    templateFn:
-      templateFn ||
-      ((item: { $index: number; data: { id: number; text: string } }) =>
-        `<div class="item">${item.$index}: ${item.data.text}</div>`),
-    noAdapter: config.noAdapter,
-    onBefore: config.onBefore
-  });
-
-  if (!config.noRelaxOnStart) {
-    // Wait for initial workflow cycle to complete
-    await fixture.relaxNext(1);
-  }
-
-  // // Debug: log actual element dimensions
-  // const debugInfo = await page.evaluate(() => {
-  //   const viewport = document.getElementById('viewport')!;
-  //   const vscroll = document.getElementById('vscroll')!;
-  //   const items = Array.from(vscroll.querySelectorAll('[data-sid]'));
-  //   const bwdPadding = vscroll.querySelector('[data-padding-backward]') as HTMLElement;
-  //   const fwdPadding = vscroll.querySelector('[data-padding-forward]') as HTMLElement;
-  //   const horizontal = (window as any).__vscroll__.workflow.scroller.settings.horizontal;
-  //   return {
-  //     viewportDimensions: {
-  //       clientWidth: viewport.clientWidth,
-  //       clientHeight: viewport.clientHeight,
-  //       scrollWidth: viewport.scrollWidth,
-  //       scrollHeight: viewport.scrollHeight
-  //     },
-  //     vscrollDimensions: {
-  //       clientWidth: vscroll.clientWidth,
-  //       clientHeight: vscroll.clientHeight,
-  //       scrollWidth: vscroll.scrollWidth,
-  //       scrollHeight: vscroll.scrollHeight
-  //     },
-  //     itemCount: items.length,
-  //     firstItemDimensions: items[0] ? {
-  //       width: (items[0] as HTMLElement).clientWidth,
-  //       height: (items[0] as HTMLElement).clientHeight,
-  //       display: getComputedStyle(items[0] as HTMLElement).display,
-  //       whiteSpace: getComputedStyle(vscroll).whiteSpace
-  //     } : null,
-  //     bwdPaddingDimensions: {
-  //       width: bwdPadding.clientWidth,
-  //       height: bwdPadding.clientHeight,
-  //       display: getComputedStyle(bwdPadding).display,
-  //       computedWidth: getComputedStyle(bwdPadding).width
-  //     },
-  //     fwdPaddingDimensions: {
-  //       width: fwdPadding.clientWidth,
-  //       height: fwdPadding.clientHeight,
-  //       display: getComputedStyle(fwdPadding).display,
-  //       computedWidth: getComputedStyle(fwdPadding).width
-  //     },
-  //     horizontal
-  //   };
-  // });
-  // console.log('[DEBUG] Initial dimensions:', JSON.stringify(debugInfo, null, 2));
-
-  return fixture;
-};
diff --git a/tests/e2e/helpers/itemsCounter.ts b/tests/e2e/helpers/itemsCounter.ts
deleted file mode 100644
index 7ef6b9bb..00000000
--- a/tests/e2e/helpers/itemsCounter.ts
+++ /dev/null
@@ -1,57 +0,0 @@
-import { Direction, type DirectionType } from '../fixture/VScrollFixture.js';
-
-/**
- * Helper class to track item counts in forward and backward directions
- */
-export class ItemsDirCounter {
-  count: number;
-  index: number;
-  padding: number;
-  paddingShift?: number;
-  size: number;
-
-  constructor(count = 0, padding = 0) {
-    this.count = count;
-    this.padding = padding;
-    this.paddingShift = 0;
-    this.index = NaN;
-    this.size = NaN;
-  }
-}
-
-/**
- * Helper class for tracking expected buffer state during scroll tests
- */
-export class ItemsCounter {
-  direction: DirectionType | null;
-  backward: ItemsDirCounter;
-  forward: ItemsDirCounter;
-  average: number;
-
-  get total(): number {
-    return this.forward.index - this.backward.index + 1;
-  }
-
-  get paddings(): number {
-    return this.forward.padding + this.backward.padding;
-  }
-
-  constructor(direction?: DirectionType) {
-    this.direction = direction || null;
-    this.forward = new ItemsDirCounter();
-    this.backward = new ItemsDirCounter();
-    this.average = NaN;
-  }
-
-  get(token: DirectionType): ItemsDirCounter {
-    return token === Direction.backward ? this.backward : this.forward;
-  }
-
-  set(token: DirectionType, value: Partial<ItemsDirCounter>): void {
-    if (token === Direction.backward) {
-      Object.assign(this.backward, value);
-    } else {
-      Object.assign(this.forward, value);
-    }
-  }
-}
diff --git a/tests/e2e/playwright.config.ts b/tests/e2e/playwright.config.ts
deleted file mode 100644
index 79bdd5d1..00000000
--- a/tests/e2e/playwright.config.ts
+++ /dev/null
@@ -1,33 +0,0 @@
-import { defineConfig, devices } from '@playwright/test';
-
-export default defineConfig({
-  testDir: './specs',
-  outputDir: './test-results',
-  fullyParallel: true,
-  forbidOnly: !!process.env.CI,
-  retries: process.env.CI ? 2 : 0,
-  workers: 1,
-  reporter: [
-    ['list'], // Detailed console output
-    ['html', { outputFolder: './playwright-report', open: 'never' }]
-  ],
-  timeout: 5000, // 5 seconds per test
-
-  use: {
-    baseURL: 'about:blank',
-    trace: 'on-first-retry',
-    screenshot: 'only-on-failure'
-    // headless: true,
-    // slowMo: 500,
-  },
-
-  projects: [
-    {
-      name: 'chromium',
-      use: {
-        ...devices['Desktop Chrome'],
-        viewport: { width: 1024, height: 517 }
-      }
-    }
-  ]
-});
diff --git a/tests/e2e/scaffolding/TestHost.ts b/tests/e2e/scaffolding/TestHost.ts
new file mode 100644
index 00000000..7791ad14
--- /dev/null
+++ b/tests/e2e/scaffolding/TestHost.ts
@@ -0,0 +1,534 @@
+import { Direction, Workflow, makeDatasource } from './vscroll';
+import type {
+  IDatasource,
+  IDatasourceConstructed,
+  Item
+} from './vscroll';
+import { getDatasource, TestDatasource } from './datasources';
+import { Expectations } from './expectations';
+import type {
+  DatasourceProcessor,
+  TemplateSettings,
+  TestConfig,
+  TestItem
+} from '../types';
+
+const Datasource = makeDatasource();
+
+// Static, per-item styles are injected once instead of being re-applied to every
+// element on every render. Only the varying bits (size, content, visibility)
+// stay in render().
+let stylesInjected = false;
+const ensureStyles = (): void => {
+  if (stylesInjected) {
+    return;
+  }
+  stylesInjected = true;
+  const style = document.createElement('style');
+  style.textContent = `
+    [data-vscroll-test-root] [data-sid],
+    [data-vscroll-test-root] [data-sid] > .item {
+      box-sizing: border-box; margin: 0; padding: 0;
+    }
+    [data-vscroll-test-root] [data-sid] > .item { overflow: hidden; }
+    [data-vscroll-test-root][data-horizontal] [data-sid],
+    [data-vscroll-test-root][data-horizontal] [data-sid] > .item {
+      display: inline-block;
+    }
+  `;
+  document.head.appendChild(style);
+};
+
+const defaultTemplateSettings: Required<
+  Omit<TemplateSettings, 'dynamicSize'>
+> & { dynamicSize: string | null } = {
+  noViewportClass: false,
+  viewportHeight: 120,
+  viewportWidth: 200,
+  itemHeight: 20,
+  itemWidth: null,
+  horizontal: false,
+  dynamicSize: null,
+  viewportPadding: 0,
+  headerHeight: 0
+};
+
+export class TestHost<Data extends TestItem = TestItem> {
+  readonly root: HTMLElement;
+  readonly viewportElement: HTMLElement;
+  readonly contentElement: HTMLElement;
+  readonly datasource: IDatasource<Data>;
+  workflow: Workflow<Data>;
+  readonly shared: Record<string, unknown> = {};
+  readonly padding: Record<Direction, { getSize: () => number }>;
+  readonly expect: Expectations<Data> = new Expectations<Data>(this);
+
+  private readonly settings: TemplateSettings;
+  private readonly windowViewport: boolean;
+  private readonly setProcessor?: (
+    processor: DatasourceProcessor<Data>
+  ) => void;
+  private renderedItems: Item<Data>[] = [];
+  private disposed = false;
+
+  get scroller(): Workflow<Data>['scroller'] {
+    return this.workflow.scroller;
+  }
+
+  get adapter(): IDatasourceConstructed<Data>['adapter'] {
+    return this.scroller.datasource.adapter;
+  }
+
+  get innerLoopCount(): number {
+    return this.scroller.state.cycle.innerLoop.total;
+  }
+
+  get horizontal(): boolean {
+    return this.scroller.settings.horizontal;
+  }
+
+  /** The active datasource, narrowed to a concrete test datasource type. */
+  source<T extends IDatasource<Data> = IDatasource<Data>>(): T {
+    return this.datasource as T;
+  }
+
+  /**
+   * Read firstVisible/lastVisible once so the workflow starts tracking them.
+   * These are "wanted" properties: vscroll only computes and emits them after
+   * they have been accessed, so tests that assert on them must prime the
+   * tracking before the first cycle runs.
+   */
+  trackVisibleItems(): void {
+    void this.adapter.firstVisible;
+    void this.adapter.lastVisible;
+  }
+
+  constructor(config: TestConfig<unknown, Data>) {
+    this.windowViewport = !!config.datasourceSettings?.windowViewport;
+    this.settings = {
+      ...defaultTemplateSettings,
+      ...(config.templateSettings || {})
+    } as TemplateSettings;
+
+    const dom = this.createDom();
+    this.root = dom.root;
+    this.viewportElement = dom.viewport;
+    this.contentElement = dom.content;
+
+    const source: IDatasource<Data> =
+      config.datasource?.() ??
+      (getDatasource() as unknown as IDatasource<Data>);
+    this.setProcessor = (
+      source as Partial<TestDatasource<Data>>
+    ).setProcessor?.bind(source);
+    const datasourceParams = {
+      ...source,
+      get: source.get.bind(source),
+      settings: {
+        ...(source.settings || {}),
+        ...(config.datasourceSettings || {})
+      },
+      devSettings: {
+        ...(source.devSettings || {}),
+        ...(config.datasourceDevSettings || {})
+      }
+    };
+
+    if (source.adapter) {
+      source.settings = datasourceParams.settings;
+      source.devSettings = datasourceParams.devSettings;
+    }
+    this.datasource = config.noAdapter
+      ? datasourceParams
+      : source.adapter
+        ? (source as IDatasourceConstructed<Data>)
+        : new Datasource<Data>(datasourceParams);
+
+    try {
+      this.workflow = this.createWorkflow();
+      this.padding = {
+        [Direction.forward]: {
+          getSize: () => this.scroller.viewport.paddings[Direction.forward].size
+        },
+        [Direction.backward]: {
+          getSize: () =>
+            this.scroller.viewport.paddings[Direction.backward].size
+        }
+      };
+    } catch (error) {
+      this.root.remove();
+      throw error;
+    }
+  }
+
+  private createWorkflow(): Workflow<Data> {
+    return new Workflow<Data>({
+      consumer: { name: 'vscroll-browser-tests', version: '1.0.0' },
+      element: this.contentElement,
+      datasource: this.datasource,
+      run: items => this.render(items)
+    });
+  }
+
+  private resetContent(): void {
+    this.renderedItems = [];
+    const backwardPadding = document.createElement('div');
+    backwardPadding.dataset.paddingBackward = '';
+    const forwardPadding = document.createElement('div');
+    forwardPadding.dataset.paddingForward = '';
+    if (this.settings.horizontal) {
+      backwardPadding.style.display = 'inline-block';
+      forwardPadding.style.display = 'inline-block';
+    }
+    this.contentElement.replaceChildren(backwardPadding, forwardPadding);
+  }
+
+  private createDom(): {
+    root: HTMLElement;
+    viewport: HTMLElement;
+    content: HTMLElement;
+  } {
+    ensureStyles();
+    const settings = this.settings;
+    const root = document.createElement('section');
+    root.dataset.vscrollTestRoot = '';
+    if (settings.horizontal) {
+      root.dataset.horizontal = '';
+    }
+    root.style.cssText =
+      'display:block;font:16px/20px sans-serif;margin:0;padding:0;';
+
+    if (settings.headerHeight) {
+      const header = document.createElement('div');
+      header.dataset.testHeader = '';
+      header.style.height = `${settings.headerHeight}px`;
+      root.appendChild(header);
+    }
+
+    const viewport = document.createElement('div');
+    viewport.dataset.testViewport = '';
+    viewport.style.boxSizing = 'content-box';
+    viewport.style.display = 'block';
+    viewport.style.margin = '0';
+    viewport.style.padding = `${settings.viewportPadding || 0}px`;
+
+    if (this.windowViewport) {
+      viewport.style.width = '100%';
+      viewport.style.overflow = 'visible';
+    } else if (settings.horizontal) {
+      viewport.style.width = `${settings.viewportWidth || 200}px`;
+      viewport.style.height = `${settings.viewportHeight || 100}px`;
+      viewport.style.overflowX = 'scroll';
+      viewport.style.overflowY = 'hidden';
+      viewport.style.whiteSpace = 'nowrap';
+    } else {
+      viewport.style.width = `${settings.viewportWidth || 200}px`;
+      viewport.style.height = `${settings.viewportHeight || 120}px`;
+      viewport.style.overflowX = 'hidden';
+      viewport.style.overflowY = 'auto';
+    }
+
+    const content = document.createElement('div');
+    content.dataset.testContent = '';
+    content.style.margin = '0';
+    content.style.padding = '0';
+    if (settings.horizontal) {
+      content.style.display = 'inline-block';
+    }
+
+    const backwardPadding = document.createElement('div');
+    backwardPadding.dataset.paddingBackward = '';
+    const forwardPadding = document.createElement('div');
+    forwardPadding.dataset.paddingForward = '';
+    if (settings.horizontal) {
+      backwardPadding.style.display = 'inline-block';
+      forwardPadding.style.display = 'inline-block';
+    }
+
+    content.append(backwardPadding, forwardPadding);
+    viewport.appendChild(content);
+    root.appendChild(viewport);
+    document.body.appendChild(root);
+
+    return { root, viewport, content };
+  }
+
+  private render(items: Item<Data>[]): void {
+    const itemSet = new Set(items);
+    this.renderedItems
+      .filter(item => !itemSet.has(item))
+      .forEach(item => item.element?.remove());
+
+    const forwardPadding = this.contentElement.querySelector(
+      '[data-padding-forward]'
+    );
+    if (!forwardPadding) {
+      throw new Error('Forward padding element is missing');
+    }
+
+    const dynamicSize = this.settings.dynamicSize as keyof Data | null;
+    const horizontal = !!this.settings.horizontal;
+    const configuredSize = horizontal
+      ? this.settings.itemWidth
+      : this.settings.itemHeight;
+
+    for (const item of items) {
+      const element = (item.element ??= document.createElement('div'));
+      element.dataset.sid = String(item.$index);
+      element.style.position = item.invisible ? 'fixed' : '';
+      element.style.left = item.invisible ? '-99999px' : '';
+
+      let templateElement = element.firstElementChild as HTMLElement | null;
+      if (!templateElement) {
+        templateElement = document.createElement('div');
+        templateElement.className = 'item';
+        element.appendChild(templateElement);
+      }
+
+      const itemSize = dynamicSize
+        ? Number(item.data[dynamicSize])
+        : Number(configuredSize);
+      if (Number.isFinite(itemSize)) {
+        templateElement.style[horizontal ? 'width' : 'height'] = `${itemSize}px`;
+      }
+
+      templateElement.innerHTML = `<span>${item.$index}</span>: <b>${item.data.text}</b>`;
+      this.contentElement.insertBefore(element, forwardPadding);
+    }
+
+    this.renderedItems = [...items];
+  }
+
+  getElements(): HTMLElement[] {
+    return Array.from(this.contentElement.querySelectorAll('[data-sid]'));
+  }
+
+  getElement(index: number): HTMLElement | null {
+    return this.contentElement.querySelector(`[data-sid="${index}"]`);
+  }
+
+  getElementIndex(element: HTMLElement): number {
+    return Number(element.dataset.sid);
+  }
+
+  getElementText(index: number): string | null {
+    return this.getElement(index)?.innerText.trim() || null;
+  }
+
+  checkElementContentByIndex(index: number): boolean {
+    return this.checkElementContent(index, index);
+  }
+
+  checkElementContent(index: number, id: number): boolean {
+    return this.getElementText(index) === `${index}: item #${id}`;
+  }
+
+  checkElementId(element: HTMLElement, index: number): boolean {
+    return element.dataset.sid === String(index);
+  }
+
+  getViewportSize(): number {
+    return this.scroller.viewport.getSize();
+  }
+
+  getScrollableSize(): number {
+    return this.scroller.viewport.getScrollableSize();
+  }
+
+  getScrollPosition(): number {
+    return this.scroller.viewport.scrollPosition;
+  }
+
+  scrollTo(position: number): void {
+    this.adapter.fix({ scrollPosition: position });
+  }
+
+  scrollMin(): void {
+    this.scrollTo(0);
+  }
+
+  scrollMax(): void {
+    this.scrollTo(Infinity);
+  }
+
+  waitNextCycle(): Promise<number> {
+    return new Promise(resolve => this.workflow.cyclesDone$.once(resolve));
+  }
+
+  waitForCycles(target: number): Promise<void> {
+    if (this.workflow.cyclesDone >= target) {
+      return Promise.resolve();
+    }
+    return new Promise(resolve => {
+      const off = this.workflow.cyclesDone$.on(cyclesDone => {
+        if (cyclesDone >= target) {
+          off();
+          resolve();
+        }
+      });
+    });
+  }
+
+  waitForAdapterInit(): Promise<void> {
+    return new Promise(resolve => {
+      const off = this.adapter.init$.on(initialized => {
+        if (initialized) {
+          off();
+          resolve();
+        }
+      });
+    });
+  }
+
+  async recreate(): Promise<void> {
+    const initialized = this.waitForAdapterInit();
+    this.workflow.dispose();
+    this.resetContent();
+    this.workflow = this.createWorkflow();
+    await initialized;
+    await this.adapter.relax();
+  }
+
+  captureInnerLoops<T>(
+    count: number,
+    snapshot: (loop: number) => T
+  ): Promise<T[]> {
+    if (count <= 0) {
+      return Promise.resolve([]);
+    }
+
+    return new Promise<T[]>((resolve, reject) => {
+      const snapshots: T[] = [];
+      const innerLoop = this.scroller.state.cycle.innerLoop;
+      const off = innerLoop.busy.on(pending => {
+        if (pending) {
+          return;
+        }
+        try {
+          snapshots.push(snapshot(innerLoop.total));
+          if (snapshots.length === count) {
+            off();
+            resolve(snapshots);
+          }
+        } catch (error) {
+          off();
+          reject(error);
+        }
+      });
+    });
+  }
+
+  async relaxNext(): Promise<void> {
+    await this.waitNextCycle();
+    await this.adapter.relax();
+  }
+
+  private async runAndRelax(
+    action: () => void | Promise<unknown>
+  ): Promise<void> {
+    const cycleDone = this.waitNextCycle();
+    await action();
+    await cycleDone;
+    await this.adapter.relax();
+  }
+
+  scrollToRelax(position: number): Promise<void> {
+    return this.runAndRelax(() =>
+      this.adapter.fix({ scrollPosition: position })
+    );
+  }
+
+  scrollMinRelax(): Promise<void> {
+    return this.scrollToRelax(0);
+  }
+
+  scrollMaxRelax(): Promise<void> {
+    return this.scrollToRelax(Infinity);
+  }
+
+  async scrollMinMaxRelax(): Promise<void> {
+    if (this.getScrollPosition() === 0) {
+      await this.scrollMaxRelax();
+      await this.scrollMinRelax();
+    } else {
+      await this.scrollMinRelax();
+      await this.scrollMaxRelax();
+    }
+  }
+
+  /** Scroll toward an edge, settling each step, until its BOF/EOF flag is set. */
+  async reachEdge(direction: Direction, maxAttempts = 50): Promise<void> {
+    const forward = direction === Direction.forward;
+    const reached = (): boolean =>
+      forward ? this.scroller.buffer.eof.get() : this.scroller.buffer.bof.get();
+
+    for (let attempt = 0; attempt < maxAttempts; attempt++) {
+      await this.adapter.relax();
+      if (reached()) {
+        return;
+      }
+      await (forward ? this.scrollMaxRelax() : this.scrollMinRelax());
+    }
+
+    throw new Error(`Unable to reach ${forward ? 'EOF' : 'BOF'}`);
+  }
+
+  async scrollToIndexRelax(index: number, maxAttempts = 20): Promise<void> {
+    for (let attempt = 0; attempt < maxAttempts; attempt++) {
+      const { firstIndex, lastIndex } = this.adapter.bufferInfo;
+      const buffered = index >= firstIndex && index <= lastIndex;
+      const edgeIndex = index > lastIndex ? lastIndex : firstIndex;
+      const position = this.getScrollPosition();
+
+      this.adapter.fix({
+        scrollToItem: item => item.$index === (buffered ? index : edgeIndex)
+      });
+
+      if (position !== this.getScrollPosition()) {
+        await this.relaxNext();
+      }
+      if (buffered) {
+        return;
+      }
+    }
+
+    throw new Error(`Unable to scroll to index ${index}`);
+  }
+
+  setDatasourceProcessor(processor: DatasourceProcessor<Data>): void {
+    if (!this.setProcessor) {
+      throw new Error('This test datasource does not support processing');
+    }
+    this.setProcessor(processor);
+  }
+
+  setItemProcessor(
+    itemUpdater: (item: { $index: number; data: Data }) => unknown
+  ): void {
+    this.setDatasourceProcessor(items => items.forEach(itemUpdater));
+  }
+
+  delay(ms: number): Promise<void> {
+    return new Promise(resolve => setTimeout(resolve, ms));
+  }
+
+  waitForPaint(): Promise<void> {
+    return new Promise(resolve => requestAnimationFrame(() => resolve()));
+  }
+
+  dispose(): void {
+    if (this.disposed) {
+      return;
+    }
+    this.disposed = true;
+    this.workflow.dispose();
+    const disposable = this.datasource as IDatasource<Data> & {
+      dispose?: () => void;
+    };
+    disposable.dispose?.();
+    this.root.remove();
+    if (this.windowViewport) {
+      window.scrollTo(0, 0);
+    }
+  }
+}
diff --git a/tests/e2e/scaffolding/data.ts b/tests/e2e/scaffolding/data.ts
new file mode 100644
index 00000000..4dc7ee6a
--- /dev/null
+++ b/tests/e2e/scaffolding/data.ts
@@ -0,0 +1,25 @@
+import type { DatasourceGet } from './vscroll';
+import type { TestItem } from '../types';
+
+export const makeItem = (id: number): TestItem => ({ id, text: `item #${id}` });
+
+export const makeItems = (firstId: number, count: number): TestItem[] =>
+  Array.from({ length: count }, (_, offset) => makeItem(firstId + offset));
+
+// A datasource `get` that appends ' *' to each item's text. Reset specs use it
+// to prove the workflow adopts a brand-new data-producing function.
+export const starGet = ((
+  index: number,
+  count: number,
+  success: (items: unknown[]) => void
+): void => {
+  success(makeItems(index, count).map(item => ({ ...item, text: `${item.text} *` })));
+}) as DatasourceGet<unknown>;
+
+const minSize = 1;
+const maxSize = 100;
+const initialSize = 20;
+
+// Deterministic per-index size profile used by dynamic-size scenarios.
+export const getDynamicSize = (index: number): number =>
+  Math.max(minSize, Math.min(maxSize, initialSize + index));
diff --git a/tests/e2e/scaffolding/datasources.ts b/tests/e2e/scaffolding/datasources.ts
new file mode 100644
index 00000000..f6cdac8d
--- /dev/null
+++ b/tests/e2e/scaffolding/datasources.ts
@@ -0,0 +1,218 @@
+import { makeDatasource } from './vscroll';
+import type { BufferUpdater, DatasourceGet } from './vscroll';
+import { makeItem } from './data';
+import type { DatasourceProcessor, IndexedItem, TestItem } from '../types';
+
+// A datasource that also lets a test inject a per-fetch processor, used to
+// mutate item data/sizes between the fetch and the workflow (e.g. dynamic size).
+export interface TestDatasource<Data = TestItem> {
+  get: DatasourceGet<Data>;
+  setProcessor(processor: DatasourceProcessor<Data>): void;
+}
+
+export interface DatasourceOptions {
+  min?: number; // inclusive lower bound; omit for unbounded
+  max?: number; // inclusive upper bound; omit for unbounded
+  delay?: number; // async delay in ms; omit/0 for synchronous delivery
+  size?: number; // per-item `size` field; omit to leave it out
+  mode?: 'callback' | 'promise' | 'observable'; // transport, default callback
+}
+
+interface MutableState {
+  min: number;
+  max: number;
+  data: TestItem[];
+  requests: Array<{ index: number; count: number }>;
+  processor?: DatasourceProcessor;
+}
+
+const Datasource = makeDatasource();
+
+export class MutableDatasource extends Datasource<TestItem> {
+  private readonly state: MutableState;
+
+  constructor(min: number, max: number, firstId = min) {
+    const state = { min, max, data: [], requests: [] } as MutableState;
+    const read = (index: number, count: number): TestItem[] => {
+      state.requests.push({ index, count });
+      const items: IndexedItem[] = [];
+      for (let current = index; current < index + count; current++) {
+        const data = state.data[current - state.min];
+        if (data) {
+          items.push({ $index: current, data });
+        }
+      }
+      state.processor?.(items, index, count, state.min, state.max);
+      return items.map(({ data }) => data);
+    };
+    super({ get: (index, count, success) => success(read(index, count)) });
+    this.state = state;
+    this.reset(min, max, firstId);
+  }
+
+  reset(min: number, max: number, firstId = min): void {
+    this.state.min = min;
+    this.state.max = max;
+    this.state.data = Array.from({ length: max - min + 1 }, (_, offset) =>
+      makeItem(firstId + offset)
+    );
+  }
+
+  setProcessor(processor: DatasourceProcessor): void {
+    this.state.processor = processor;
+  }
+
+  insert(
+    items: TestItem[],
+    index: number,
+    before: boolean,
+    decrease = false
+  ): void {
+    const offset = index - this.state.min;
+    if (offset >= 0 && offset < this.state.data.length) {
+      this.state.data.splice(offset + (before ? 0 : 1), 0, ...items);
+    }
+    this.state.min -= decrease ? items.length : 0;
+    this.state.max += decrease ? 0 : items.length;
+  }
+
+  remove(indexes: number[], increase = false): void {
+    const indexSet = new Set(indexes);
+    const min = this.state.min;
+    let removed = 0;
+    this.state.data = this.state.data.filter((_item, offset) => {
+      const remove = indexSet.has(min + offset);
+      removed += Number(remove);
+      return !remove;
+    });
+    this.state.min += increase ? removed : 0;
+    this.state.max -= increase ? 0 : removed;
+  }
+
+  replace(indexes: number[], items: TestItem[], fixRight = false): void {
+    const sorted = [...indexes].sort((a, b) => a - b);
+    const first = sorted[0];
+    const last = sorted[sorted.length - 1];
+    const removed = last - first + 1;
+    const delta = items.length - removed;
+
+    this.state.data.splice(first - this.state.min, removed, ...items);
+    this.state.min -= fixRight ? delta : 0;
+    this.state.max += fixRight ? 0 : delta;
+  }
+
+  update(predicate: BufferUpdater<TestItem>, fixRight = false): void {
+    const min = this.state.min;
+    const data = this.state.data.flatMap((item, offset) => {
+      const result = predicate({ uid: 0, $index: min + offset, data: item });
+      return result === true
+        ? [item]
+        : Array.isArray(result)
+          ? (result as TestItem[])
+          : [];
+    });
+    const delta = data.length - this.state.data.length;
+
+    this.state.data = data;
+    this.state.min -= fixRight ? delta : 0;
+    this.state.max += fixRight ? 0 : delta;
+  }
+
+  setSizes(getSize: (index: number) => number): void {
+    this.state.data.forEach(
+      (item, offset) => (item.size = getSize(this.state.min + offset))
+    );
+  }
+
+  setSize(index: number, size: number): void {
+    const item = this.state.data[index - this.state.min];
+    if (item) {
+      item.size = size;
+    }
+  }
+
+  clearRequests(): void {
+    this.state.requests.length = 0;
+  }
+
+  get requests(): ReadonlyArray<{ index: number; count: number }> {
+    return this.state.requests;
+  }
+}
+
+export const getDatasource = (
+  options: DatasourceOptions = {}
+): TestDatasource => {
+  const { min, max, delay = 0, size, mode = 'callback' } = options;
+  let processor: DatasourceProcessor | undefined;
+
+  const read = (index: number, count: number): TestItem[] => {
+    const items: IndexedItem[] = [];
+    for (let i = index; i < index + count; i++) {
+      if ((min === undefined || i >= min) && (max === undefined || i <= max)) {
+        items.push({
+          $index: i,
+          data: { ...makeItem(i), ...(size === undefined ? {} : { size }) }
+        });
+      }
+    }
+    processor?.(items, index, count, min, max);
+    return items.map(({ data }) => data);
+  };
+
+  const get = (
+    index: number,
+    count: number,
+    success?: (data: TestItem[]) => void
+  ): unknown => {
+    if (mode === 'promise') {
+      return new Promise<TestItem[]>(resolve =>
+        delay
+          ? setTimeout(() => resolve(read(index, count)), delay)
+          : resolve(read(index, count))
+      );
+    }
+    if (mode === 'observable') {
+      return {
+        subscribe(
+          next: (data: TestItem[]) => void,
+          _error: (error: unknown) => void,
+          complete: () => void
+        ) {
+          let active = true;
+          const emit = () => {
+            if (!active) {
+              return;
+            }
+            next(read(index, count));
+            complete();
+          };
+          const timer = delay ? setTimeout(emit, delay) : undefined;
+          if (!delay) {
+            emit();
+          }
+          return {
+            unsubscribe: () => {
+              active = false;
+              if (timer) {
+                clearTimeout(timer);
+              }
+            }
+          };
+        }
+      };
+    }
+    if (delay) {
+      setTimeout(() => success?.(read(index, count)), delay);
+    } else {
+      success?.(read(index, count));
+    }
+  };
+
+  return {
+    get: get as DatasourceGet<TestItem>,
+    setProcessor: processorFn => {
+      processor = processorFn;
+    }
+  };
+};
diff --git a/tests/e2e/scaffolding/expectations.ts b/tests/e2e/scaffolding/expectations.ts
new file mode 100644
index 00000000..706d3f0b
--- /dev/null
+++ b/tests/e2e/scaffolding/expectations.ts
@@ -0,0 +1,157 @@
+import { Direction } from './vscroll';
+import { TestHost } from './TestHost';
+import type { TestItem } from '../types';
+
+const range = (from: number, to: number): number[] =>
+  Array.from({ length: to - from + 1 }, (_, i) => from + i);
+
+/** Assertions over a TestHost's state, reached via `misc.expect`. */
+export class Expectations<Data extends TestItem> {
+  constructor(private readonly host: TestHost<Data>) {}
+
+  /** DOM padding elements render exactly the model's padding sizes. */
+  paddingsReflectModel(): void {
+    const { host } = this;
+    const domSize = (direction: Direction): number => {
+      const element = host.contentElement.querySelector(
+        `[data-padding-${direction}]`
+      ) as HTMLElement | null;
+      const rect = element?.getBoundingClientRect();
+      return rect ? (host.horizontal ? rect.width : rect.height) : NaN;
+    };
+    const { paddings } = host.scroller.viewport;
+    expect(domSize(Direction.backward)).toBe(paddings.backward.size);
+    expect(domSize(Direction.forward)).toBe(paddings.forward.size);
+  }
+
+  /** DOM and Buffer contain the same contiguous indexed items. */
+  domIndexesMatchBuffer(): void {
+    const { host } = this;
+    const domIndexes = host.getElements().map(el => host.getElementIndex(el));
+    const bufferIndexes = host.scroller.buffer.items.map(item => item.$index);
+
+    expect(domIndexes).toEqual(bufferIndexes);
+    this.paddingsReflectModel();
+
+    if (!bufferIndexes.length) {
+      return;
+    }
+    const { firstIndex, lastIndex } = host.adapter.bufferInfo;
+    expect(bufferIndexes).toEqual(range(firstIndex, lastIndex));
+  }
+
+  /** Also verifies the standard test datasource content for every item. */
+  domMatchesBuffer(): void {
+    const { host } = this;
+    this.domIndexesMatchBuffer();
+    host
+      .getElements()
+      .map(el => host.getElementIndex(el))
+      .forEach(index =>
+        expect(host.checkElementContentByIndex(index)).toBe(true)
+      );
+  }
+
+  /** Bounded-side paddings for uniform-size data. */
+  uniformPaddings(): void {
+    const { host } = this;
+    if (!host.scroller.buffer.items.length) {
+      return;
+    }
+    const { firstIndex, lastIndex, absMinIndex, absMaxIndex } =
+      host.adapter.bufferInfo;
+    const size = host.scroller.buffer.defaultSize;
+
+    if (Number.isFinite(absMinIndex)) {
+      expect(host.padding[Direction.backward].getSize()).toBe(
+        (firstIndex - absMinIndex) * size
+      );
+    }
+    if (Number.isFinite(absMaxIndex)) {
+      expect(host.padding[Direction.forward].getSize()).toBe(
+        (absMaxIndex - lastIndex) * size
+      );
+    }
+  }
+
+  consistent(): void {
+    this.domMatchesBuffer();
+    this.uniformPaddings();
+  }
+
+  startVisible(startIndex: number): void {
+    const { host } = this;
+    expect(host.adapter.firstVisible.$index).toBe(startIndex);
+    expect(host.checkElementContentByIndex(startIndex)).toBe(true);
+  }
+
+  /** Exact Buffer edges without predicting fetch and clip decisions. */
+  bufferRange([firstIndex, lastIndex]: [number, number]): void {
+    const info = this.host.adapter.bufferInfo;
+    expect(info.firstIndex).toBe(firstIndex);
+    expect(info.lastIndex).toBe(lastIndex);
+  }
+
+  noForwardGap(): void {
+    const { host } = this;
+    const children = host.contentElement.children;
+    const lastItem = children[children.length - 2] as HTMLElement;
+    const viewport = host.viewportElement.getBoundingClientRect();
+    const item = lastItem.getBoundingClientRect();
+    const gap = host.horizontal
+      ? Math.max(0, viewport.right - item.right)
+      : Math.max(0, viewport.bottom - item.bottom);
+
+    expect(gap).toBe(0);
+    expect(host.padding[Direction.forward].getSize()).toBe(0);
+  }
+
+  /** Rendered items cover both viewport edges. */
+  viewportFilled(): void {
+    const { host } = this;
+    this.domMatchesBuffer();
+
+    const elements = host.getElements();
+    expect(elements.length).toBeGreaterThan(0);
+
+    const first = elements[0].getBoundingClientRect();
+    const last = elements[elements.length - 1].getBoundingClientRect();
+    const viewport = host.viewportElement.getBoundingClientRect();
+
+    if (host.horizontal) {
+      expect(first.left).toBeLessThanOrEqual(viewport.left + 1);
+      expect(last.right).toBeGreaterThanOrEqual(viewport.right - 1);
+    } else {
+      expect(first.top).toBeLessThanOrEqual(viewport.top + 1);
+      expect(last.bottom).toBeGreaterThanOrEqual(viewport.bottom - 1);
+    }
+  }
+
+  /** The visible window stays within the buffered index range. */
+  visibleWithinBuffer(): void {
+    const { adapter } = this.host;
+    const { firstIndex, lastIndex } = adapter.bufferInfo;
+    expect(adapter.firstVisible.$index).toBeGreaterThanOrEqual(firstIndex);
+    expect(adapter.lastVisible.$index).toBeLessThanOrEqual(lastIndex);
+  }
+
+  uniqueItems(
+    items: ReadonlyArray<{ uid: number }> = this.host.scroller.buffer.items
+  ): void {
+    expect(new Set(items.map(({ uid }) => uid)).size).toBe(items.length);
+  }
+
+  itemsIdentity(
+    before: ReadonlyArray<{ uid: number; data: { id: number } }>,
+    after: ReadonlyArray<{
+      uid: number;
+      data: { id: number };
+    }> = this.host.scroller.buffer.items
+  ): void {
+    after.forEach(item => {
+      const previous = before.find(({ data }) => data.id === item.data.id);
+      expect(previous?.uid).toBe(item.uid);
+    });
+    this.uniqueItems(after);
+  }
+}
\ No newline at end of file
diff --git a/tests/e2e/scaffolding/index.ts b/tests/e2e/scaffolding/index.ts
new file mode 100644
index 00000000..6529301a
--- /dev/null
+++ b/tests/e2e/scaffolding/index.ts
@@ -0,0 +1,8 @@
+export * from './vscroll';
+export * from './data';
+export * from './datasources';
+export * from './TestHost';
+export { TestHost as Misc } from './TestHost';
+export * from './expectations';
+export * from './runner';
+export * from '../types';
diff --git a/tests/e2e/scaffolding/runner.ts b/tests/e2e/scaffolding/runner.ts
new file mode 100644
index 00000000..b3f1e29f
--- /dev/null
+++ b/tests/e2e/scaffolding/runner.ts
@@ -0,0 +1,108 @@
+import { describe, test } from 'vitest';
+import { TestHost } from './TestHost';
+import type { TestConfig, TestItem } from '../types';
+
+export type OperationConfig<
+  Operation extends PropertyKey,
+  Custom = void,
+  Data = TestItem
+> = {
+  [key in Operation]: TestConfig<Custom, Data>;
+};
+
+type TestBody = void | Promise<void> | (() => void | Promise<void>);
+
+export type ItFunc<Data extends TestItem = TestItem> = (
+  misc: TestHost<Data>
+) => TestBody;
+
+export type ItFuncConfig<
+  Custom = void,
+  Data extends TestItem = TestItem
+> = (config: TestConfig<Custom, Data>) => ItFunc<Data>;
+
+export interface MakeTestConfig<
+  Custom = void,
+  Data extends TestItem = TestItem
+> {
+  title: string;
+  meta?: string;
+  config: TestConfig<Custom, Data>;
+  it: ItFunc<Data>;
+  before?: (misc: TestHost<Data>) => void | Promise<void>;
+  after?: (misc: TestHost<Data>) => void | Promise<void>;
+}
+
+const metaTitle = <Custom, Data extends TestItem>(
+  data: MakeTestConfig<Custom, Data>
+): string => {
+  const result: string[] = [];
+  const template = data.config.templateSettings;
+  const settings = data.config.datasourceSettings;
+
+  if (template?.viewportHeight) {
+    result.push(`vp height = ${template.viewportHeight}`);
+  }
+  if (template?.viewportWidth) {
+    result.push(`vp width = ${template.viewportWidth}`);
+  }
+  if (settings?.padding) {
+    result.push(`padding = ${settings.padding}`);
+  }
+  if (settings?.itemSize) {
+    result.push(`itemSize = ${settings.itemSize}`);
+  }
+  if (settings?.startIndex) {
+    result.push(`start = ${settings.startIndex}`);
+  }
+  if (settings?.bufferSize) {
+    result.push(`buffer = ${settings.bufferSize}`);
+  }
+  if (settings?.horizontal) {
+    result.push('HORIZONTAL');
+  }
+  if (settings?.windowViewport) {
+    result.push('ENTIRE WINDOW');
+  }
+  if (data.meta) {
+    result.push(data.meta);
+  }
+
+  return `[${result.join(', ') || 'default params'}]`;
+};
+
+const runBody = async (body: TestBody): Promise<void> => {
+  await (typeof body === 'function' ? body() : body);
+};
+
+export const makeTest = <Custom = void, Data extends TestItem = TestItem>(
+  data: MakeTestConfig<Custom, Data>
+): void => {
+  describe(metaTitle(data), () => {
+    test(
+      data.title,
+      async () => {
+        const misc = new TestHost<Data>(
+          data.config as TestConfig<unknown, Data>
+        );
+        try {
+          await data.before?.(misc);
+          await runBody(data.it(misc));
+          await data.after?.(misc);
+          // Enforce the core invariant on every test: once the body settles, the
+          // rendered DOM must mirror the buffer (same contiguous indexes, paddings
+          // reflecting the model). This is a general property of a healthy
+          // scroller, not a per-test assertion, so it runs here for all tests.
+          // Opt out via `skipInvariantAutoCheck` when a test intentionally ends
+          // in a non-settled state (disposed, paused, halted, mid-burst, error).
+          if (!data.config.skipInvariantAutoCheck) {
+            misc.expect.domIndexesMatchBuffer();
+          }
+        } finally {
+          misc.dispose();
+        }
+      },
+      data.config.timeout || 2000
+    );
+  });
+};
diff --git a/tests/e2e/scaffolding/vscroll.ts b/tests/e2e/scaffolding/vscroll.ts
new file mode 100644
index 00000000..6c3f67c5
--- /dev/null
+++ b/tests/e2e/scaffolding/vscroll.ts
@@ -0,0 +1,25 @@
+export {
+  AdapterPropName,
+  Direction,
+  SizeStrategy,
+  Workflow,
+  makeDatasource
+} from '../../../src/index';
+
+export { Settings as ParsedSettings } from '../../../src/classes/settings';
+export { getDefaultAdapterProps } from '../../../src/classes/adapter/props';
+
+export type {
+  AdapterClipOptions,
+  AdapterMethodResult,
+  BufferUpdater,
+  DatasourceGet,
+  DevSettings,
+  IDatasource,
+  IDatasourceConstructed,
+  IDatasourceOptional,
+  IAdapterProp,
+  Item,
+  ItemAdapter,
+  Settings
+} from '../../../src/interfaces/index';
diff --git a/tests/e2e/specs/adapter-promises.spec.ts b/tests/e2e/specs/adapter-promises.spec.ts
new file mode 100644
index 00000000..ba39ae1d
--- /dev/null
+++ b/tests/e2e/specs/adapter-promises.spec.ts
@@ -0,0 +1,294 @@
+import {
+  AdapterPropName as Adapter,
+  getDatasource,
+  makeItem,
+  makeTest,
+  Misc,
+  AdapterMethodResult,
+  TestConfig
+} from '../scaffolding';
+
+type Resolution = 'async cycle' | 'sync cycle' | 'immediate' | 'error';
+
+interface MethodScenario {
+  method: Adapter;
+  invoke: (misc: Misc) => Promise<AdapterMethodResult>;
+  bufferSize?: number;
+  prepare?: (misc: Misc) => void;
+}
+
+interface ConcurrentScenario {
+  min: number;
+  max: number;
+  startIndex: number;
+  count: number;
+  horizontal?: boolean;
+  interrupt?: 'reload' | 'reset';
+}
+
+const itemSize = 20;
+
+const delayedScenarios: MethodScenario[] = [
+  {
+    method: Adapter.reset,
+    invoke: misc => misc.adapter.reset()
+  },
+  {
+    method: Adapter.reload,
+    invoke: misc => misc.adapter.reload()
+  },
+  {
+    method: Adapter.append,
+    invoke: misc => misc.adapter.append({ items: [makeItem(100.1)] })
+  },
+  {
+    method: Adapter.prepend,
+    invoke: misc => misc.adapter.prepend({ items: [makeItem(100.1)] })
+  },
+  {
+    method: Adapter.check,
+    invoke: misc => misc.adapter.check(),
+    prepare: misc =>
+      misc.adapter.fix({
+        updater: ({ $index }) => {
+          const element = misc.getElement($index);
+          if (element) {
+            element.style.height = '5px';
+          }
+        }
+      })
+  },
+  {
+    method: Adapter.remove,
+    invoke: misc =>
+      misc.adapter.remove({ predicate: ({ $index }) => $index > 1 })
+  },
+  {
+    method: Adapter.insert,
+    invoke: misc =>
+      misc.adapter.insert({
+        after: ({ $index }) => $index === 5,
+        items: [makeItem(5.1)]
+      })
+  },
+  {
+    method: Adapter.update,
+    invoke: misc =>
+      misc.adapter.update({ predicate: ({ $index }) => $index !== 1 })
+  }
+];
+
+const immediateScenarios: MethodScenario[] = [
+  {
+    method: Adapter.append,
+    invoke: misc => misc.adapter.append({ items: [makeItem(100.1)], eof: true })
+  },
+  {
+    method: Adapter.prepend,
+    invoke: misc =>
+      misc.adapter.prepend({ items: [makeItem(100.1)], bof: true })
+  },
+  {
+    method: Adapter.check,
+    invoke: misc => misc.adapter.check()
+  },
+  {
+    method: Adapter.remove,
+    invoke: misc =>
+      misc.adapter.remove({ predicate: ({ $index }) => $index > 100 })
+  },
+  {
+    method: Adapter.insert,
+    invoke: misc =>
+      misc.adapter.insert({
+        after: ({ $index }) => $index === 55,
+        items: [makeItem(55.1)]
+      })
+  },
+  {
+    method: Adapter.fix,
+    invoke: misc => misc.adapter.fix({ minIndex: -99 })
+  },
+  {
+    method: Adapter.update,
+    invoke: misc => misc.adapter.update({ predicate: _item => true })
+  }
+];
+
+const synchronousScenarios: MethodScenario[] = [1, 40].map(bufferSize => ({
+  method: Adapter.clip,
+  invoke: misc => misc.adapter.clip(),
+  bufferSize
+}));
+
+const errorScenarios: MethodScenario[] = [
+  {
+    method: Adapter.reset,
+    invoke: misc => misc.adapter.reset({ get: 'error' } as never)
+  },
+  {
+    method: Adapter.append,
+    invoke: misc => misc.adapter.append({ items: 'error' } as never)
+  },
+  {
+    method: Adapter.remove,
+    invoke: misc => misc.adapter.remove('error' as never)
+  },
+  {
+    method: Adapter.insert,
+    invoke: misc => misc.adapter.insert('error' as never)
+  },
+  {
+    method: Adapter.fix,
+    invoke: misc => misc.adapter.fix({ minIndex: 'error' } as never)
+  }
+];
+
+const concurrentScenarios: ConcurrentScenario[] = [
+  { min: 1, max: 100, startIndex: 100, count: 25 },
+  {
+    min: 51,
+    max: 200,
+    startIndex: 200,
+    count: 30,
+    horizontal: true
+  },
+  { min: 1, max: 100, startIndex: 100, count: 99, interrupt: 'reload' },
+  {
+    min: 51,
+    max: 200,
+    startIndex: 200,
+    count: 99,
+    horizontal: true,
+    interrupt: 'reset'
+  }
+];
+
+const createMethodConfig = (scenario: MethodScenario): TestConfig => ({
+  datasource: () => getDatasource({ delay: 25, mode: 'observable' }),
+  datasourceSettings: {
+    itemSize,
+    startIndex: 1,
+    bufferSize: scenario.bufferSize ?? 10,
+    padding: 0.5
+  },
+  templateSettings: { viewportHeight: itemSize * 10, itemHeight: itemSize },
+  timeout: 4000
+});
+
+const createConcurrentConfig = (
+  scenario: ConcurrentScenario
+): TestConfig => ({
+  datasource: () => getDatasource({ min: scenario.min, max: scenario.max }),
+  datasourceSettings: {
+    startIndex: scenario.startIndex,
+    ...(scenario.horizontal ? { horizontal: true } : {})
+  },
+  templateSettings: scenario.horizontal
+    ? { viewportWidth: 450, itemWidth: 100, horizontal: true }
+    : { itemHeight: itemSize },
+  timeout: 4000
+});
+
+const registerMethodScenario =
+  (resolution: Resolution) =>
+  (scenario: MethodScenario): void => {
+    const startsCycle = resolution.endsWith('cycle');
+    const completesSynchronously = resolution === 'sync cycle';
+    const error = resolution === 'error';
+
+    makeTest({
+      config: createMethodConfig(scenario),
+      title: `should resolve ${scenario.method} with the expected result`,
+      meta: resolution,
+      it: misc => async () => {
+        await misc.relaxNext();
+        expect(misc.workflow.cyclesDone).toBe(1);
+        scenario.prepare?.(misc);
+
+        const resultPromise = scenario.invoke(misc);
+        expect(misc.workflow.cyclesDone).toBe(completesSynchronously ? 2 : 1);
+
+        const result = await resultPromise;
+        expect(misc.workflow.cyclesDone).toBe(startsCycle ? 2 : 1);
+        expect(result.immediate).toBe(!startsCycle);
+        expect(result.success).toBe(!error);
+
+        if (error) {
+          expect(result.details).toBeTruthy();
+          expect(misc.workflow.errors).toHaveLength(1);
+          expect(misc.workflow.errors[0].process).toBe(
+            `adapter.${scenario.method}`
+          );
+        } else {
+          expect(result.details).toBeNull();
+          expect(misc.workflow.errors).toHaveLength(0);
+        }
+      }
+    });
+  };
+
+const appendAndScroll = async (
+  misc: Misc,
+  index: number
+): Promise<AdapterMethodResult> => {
+  const ready = await misc.adapter.relax();
+  if (!ready.success) {
+    return ready;
+  }
+  const appended = await misc.adapter.append(makeItem(index));
+  if (!appended.success) {
+    return appended;
+  }
+  return misc.adapter.fix({ scrollPosition: Infinity });
+};
+
+const registerConcurrentScenario = (scenario: ConcurrentScenario): void =>
+  makeTest({
+    config: createConcurrentConfig(scenario),
+    title: scenario.interrupt
+      ? `should settle all promises after ${scenario.interrupt}`
+      : 'should run concurrent nested sequences in order',
+    it: misc => async () => {
+      const initialInstance = misc.scroller.settings.instanceIndex;
+      await misc.relaxNext();
+      const initialPosition = misc.getScrollPosition();
+      const initialSize = misc.scroller.buffer.defaultSize;
+      const tasks = Array.from({ length: scenario.count }, (_, index) =>
+        appendAndScroll(misc, scenario.startIndex + index + 1)
+      );
+
+      if (scenario.interrupt) {
+        await misc.adapter[scenario.interrupt]();
+      }
+      const results = await Promise.all(tasks);
+      await misc.adapter.relax();
+
+      expect(results).toHaveLength(scenario.count);
+      if (scenario.interrupt) {
+        expect(misc.workflow.cyclesDone).toBe(2);
+        expect(misc.scroller.settings.instanceIndex).toBe(
+          initialInstance + (scenario.interrupt === 'reset' ? 1 : 0)
+        );
+      } else {
+        expect(results.every(result => result.success)).toBe(true);
+        expect(misc.getScrollPosition()).toBe(
+          initialPosition + initialSize * scenario.count
+        );
+        expect(misc.workflow.cyclesDone).toBe(scenario.count + 1);
+        expect(misc.scroller.settings.instanceIndex).toBe(initialInstance);
+      }
+    }
+  });
+
+describe('Adapter Promises Spec', () => {
+  describe('Promisified methods', () => {
+    delayedScenarios.forEach(registerMethodScenario('async cycle'));
+    synchronousScenarios.forEach(registerMethodScenario('sync cycle'));
+    immediateScenarios.forEach(registerMethodScenario('immediate'));
+    errorScenarios.forEach(registerMethodScenario('error'));
+  });
+
+  describe('Concurrent sequences', () =>
+    concurrentScenarios.forEach(registerConcurrentScenario));
+});
diff --git a/tests/e2e/specs/adapter.append-prepend.spec.ts b/tests/e2e/specs/adapter.append-prepend.spec.ts
new file mode 100644
index 00000000..ce021b4d
--- /dev/null
+++ b/tests/e2e/specs/adapter.append-prepend.spec.ts
@@ -0,0 +1,363 @@
+import {
+  AdapterPropName as Adapter,
+  Direction,
+  getDatasource,
+  makeItems,
+  makeTest,
+  Misc,
+  MutableDatasource,
+  TestConfig,
+  TestItem
+} from '../scaffolding';
+
+type Operation = Adapter.append | Adapter.prepend;
+
+interface VirtualOutcome {
+  absMinIndex: number;
+  absMaxIndex: number;
+  bufferShift: number;
+  edgeIndex: number;
+  edgeId: number;
+  sourceFirstId: number;
+}
+
+interface EmptyGolden {
+  firstIndex: number;
+  lastIndex: number;
+  firstId: number;
+  scrollPosition?: number;
+}
+
+const min = 1;
+const max = 100;
+const itemSize = 20;
+const bufferSize = 10;
+const padding = 0.5;
+const amount = 3;
+const emptyAmount = 25;
+const operations: Operation[] = [Adapter.append, Adapter.prepend];
+
+// Pure geometry derived from the config above (not scroller heuristics): the
+// scrollable size is simply the item count times the item size.
+const datasetScrollable = (max - min + 1) * itemSize; // full dataset, px
+const virtualAddedScrollable = datasetScrollable + amount * itemSize; // + N virtual
+const emptyIndexedScrollable = emptyAmount * itemSize; // indexed-empty ds once filled
+
+const getVirtualOutcome = (
+  operation: Operation,
+  opposite: boolean
+): VirtualOutcome => {
+  if (operation === Adapter.append) {
+    // decrease (opposite) shifts existing indexes down instead of growing max
+    const absMinIndex = opposite ? min - amount : min;
+    const absMaxIndex = opposite ? max : max + amount;
+    return {
+      absMinIndex,
+      absMaxIndex,
+      bufferShift: opposite ? -amount : 0,
+      edgeIndex: absMaxIndex,
+      edgeId: max + amount,
+      sourceFirstId: min
+    };
+  }
+  // prepend; increase (opposite) shifts existing indexes up instead of growing min
+  const absMinIndex = opposite ? min : min - amount;
+  const absMaxIndex = opposite ? max + amount : max;
+  return {
+    absMinIndex,
+    absMaxIndex,
+    bufferShift: opposite ? amount : 0,
+    edgeIndex: absMinIndex,
+    edgeId: min - amount,
+    sourceFirstId: min - amount
+  };
+};
+
+const indexedEmptyGoldens: Record<Operation, [EmptyGolden, EmptyGolden]> = {
+  [Adapter.append]: [
+    { firstIndex: 76, lastIndex: 100, firstId: 77, scrollPosition: 0 },
+    { firstIndex: 52, lastIndex: 76, firstId: 77, scrollPosition: 300 }
+  ],
+  [Adapter.prepend]: [
+    { firstIndex: 1, lastIndex: 25, firstId: 1, scrollPosition: 300 },
+    { firstIndex: 25, lastIndex: 49, firstId: 1, scrollPosition: 0 }
+  ]
+};
+
+const unboundedEmptyGoldens: Record<Operation, [EmptyGolden, EmptyGolden]> = {
+  [Adapter.append]: [
+    { firstIndex: 1, lastIndex: 25, firstId: 1 },
+    { firstIndex: -23, lastIndex: 1, firstId: 1 }
+  ],
+  [Adapter.prepend]: [
+    { firstIndex: -23, lastIndex: 1, firstId: -23 },
+    { firstIndex: 1, lastIndex: 25, firstId: -23 }
+  ]
+};
+
+const getDirection = (operation: Operation): Direction =>
+  operation === Adapter.append ? Direction.forward : Direction.backward;
+
+const getOppositeDirection = (operation: Operation): Direction =>
+  operation === Adapter.append ? Direction.backward : Direction.forward;
+
+const addItems = (
+  misc: Misc,
+  operation: Operation,
+  items: TestItem[],
+  opposite: boolean,
+  boundary?: boolean,
+  virtualize = false
+) =>
+  operation === Adapter.append
+    ? misc.adapter.append({
+        items,
+        decrease: opposite,
+        ...(virtualize ? { virtualize: true } : { eof: !!boundary })
+      })
+    : misc.adapter.prepend({
+        items,
+        increase: opposite,
+        ...(virtualize ? { virtualize: true } : { bof: !!boundary })
+      });
+
+const createBasicConfig = (operation: Operation): TestConfig => ({
+  datasource: () => getDatasource({ min, max }),
+  datasourceSettings: {
+    startIndex:
+      operation === Adapter.append ? max - bufferSize + 1 - amount : min,
+    minIndex: operation === Adapter.append ? min : min + amount,
+    maxIndex: operation === Adapter.append ? max - amount : max,
+    bufferSize,
+    padding
+  },
+  templateSettings: { viewportHeight: 200, itemHeight: itemSize }
+});
+
+const createVirtualConfig = (
+  operation: Operation,
+  atOperationEdge: boolean
+): TestConfig => ({
+  datasource: () => new MutableDatasource(min, max),
+  datasourceSettings: {
+    startIndex: atOperationEdge
+      ? operation === Adapter.append
+        ? max
+        : min
+      : operation === Adapter.append
+        ? min
+        : max,
+    minIndex: min,
+    maxIndex: max,
+    bufferSize,
+    padding
+  },
+  templateSettings: { viewportHeight: 200, itemHeight: itemSize }
+});
+
+const createEmptyConfig = (
+  operation: Operation,
+  indexed: boolean
+): TestConfig => ({
+  datasource: () => getDatasource({ min: 1, max: 0 }),
+  datasourceSettings: indexed
+    ? {
+        startIndex:
+          operation === Adapter.append
+            ? max - emptyAmount + 1
+            : min + emptyAmount - 1,
+        ...(operation === Adapter.append
+          ? { maxIndex: max - emptyAmount + 1 }
+          : { minIndex: min + emptyAmount - 1 }),
+        bufferSize: emptyAmount,
+        padding
+      }
+    : {},
+  templateSettings: { viewportHeight: 200, itemHeight: itemSize }
+});
+
+const registerImmediate = (operation: Operation, opposite: boolean): void =>
+  makeTest({
+    config: createBasicConfig(operation),
+    title: `should ${operation} immediately${opposite ? ' (opposite)' : ''}`,
+    it: misc => async () => {
+      await misc.relaxNext();
+      const direction = getDirection(operation);
+      const items =
+        operation === Adapter.append
+          ? makeItems(max - amount + 1, amount)
+          : makeItems(min, amount).reverse();
+      const initialScrollableSize = (max - amount) * itemSize;
+
+      expect(misc.getScrollableSize()).toBe(initialScrollableSize);
+      expect(misc.padding[direction].getSize()).toBe(0);
+
+      const result = addItems(misc, operation, items, opposite);
+      expect(misc.getScrollableSize()).toBe(initialScrollableSize);
+      expect((await result).success).toBe(true);
+      await misc.adapter.relax();
+
+      const shift = operation === Adapter.append ? -amount : amount;
+      const expectedShift = opposite ? shift : 0;
+      const { bufferInfo } = misc.adapter;
+      expect(misc.getScrollableSize()).toBe(max * itemSize);
+      expect(misc.padding[direction].getSize()).toBe(0);
+      expect(bufferInfo.absMinIndex).toBe(min + expectedShift);
+      expect(bufferInfo.absMaxIndex).toBe(max + expectedShift);
+
+      const edgeIndex =
+        operation === Adapter.append
+          ? max + expectedShift
+          : min + expectedShift;
+      expect(
+        operation === Adapter.append ? bufferInfo.maxIndex : bufferInfo.minIndex
+      ).toBe(edgeIndex);
+      expect(
+        misc.checkElementContent(
+          edgeIndex,
+          operation === Adapter.append ? max : min
+        )
+      ).toBe(true);
+      misc.expect.domIndexesMatchBuffer();
+    }
+  });
+
+const registerVirtual = (
+  operation: Operation,
+  opposite: boolean,
+  atOperationEdge: boolean
+): void =>
+  makeTest({
+    config: createVirtualConfig(operation, atOperationEdge),
+    title:
+      `should ${operation} virtually after scroll` +
+      (atOperationEdge ? ' (at EOF/BOF)' : '') +
+      (opposite ? ' (opposite)' : ''),
+    it: misc => async () => {
+      await misc.relaxNext();
+      const append = operation === Adapter.append;
+      const direction = getDirection(operation);
+      const oppositeDirection = getOppositeDirection(operation);
+      const outcome = getVirtualOutcome(operation, opposite);
+      const { viewport, buffer } = misc.scroller;
+      const beforeItems = [...buffer.items];
+      const firstVisibleId = misc.adapter.firstVisible.data.id;
+      const lastVisibleId = misc.adapter.lastVisible.data.id;
+      const directionPadding = misc.padding[direction].getSize();
+      const oppositePadding = misc.padding[oppositeDirection].getSize();
+      const bufferedEdge = append ? buffer.lastIndex : buffer.firstIndex;
+      const items = makeItems(append ? 101 : -2, amount);
+
+      expect(misc.getScrollableSize()).toBe(datasetScrollable);
+      expect(atOperationEdge ? directionPadding : oppositePadding).toBe(0);
+
+      misc.source<MutableDatasource>().reset(
+        outcome.absMinIndex,
+        outcome.absMaxIndex,
+        outcome.sourceFirstId
+      );
+      const result = await addItems(
+        misc,
+        operation,
+        items,
+        opposite,
+        true,
+        atOperationEdge
+      );
+      expect(result.success).toBe(true);
+
+      expect(append ? buffer.lastIndex : buffer.firstIndex).toBe(
+        bufferedEdge + outcome.bufferShift
+      );
+      misc.expect.itemsIdentity(beforeItems, buffer.items);
+      expect(misc.adapter.firstVisible.data.id).toBe(firstVisibleId);
+      expect(misc.adapter.lastVisible.data.id).toBe(lastVisibleId);
+      expect(viewport.getScrollableSize()).toBe(virtualAddedScrollable);
+      expect(misc.padding[direction].getSize()).toBe(
+        directionPadding + amount * itemSize
+      );
+      expect(misc.padding[oppositeDirection].getSize()).toBe(oppositePadding);
+      expect(buffer.absMinIndex).toBe(outcome.absMinIndex);
+      expect(buffer.absMaxIndex).toBe(outcome.absMaxIndex);
+
+      if (append) {
+        await misc.scrollMaxRelax();
+      } else {
+        await misc.scrollMinRelax();
+      }
+
+      expect(viewport.getScrollableSize()).toBe(virtualAddedScrollable);
+      expect(misc.padding[direction].getSize()).toBe(0);
+      expect(buffer.absMinIndex).toBe(outcome.absMinIndex);
+      expect(buffer.absMaxIndex).toBe(outcome.absMaxIndex);
+      expect(append ? buffer.lastIndex : buffer.firstIndex).toBe(
+        outcome.edgeIndex
+      );
+      expect(misc.checkElementContent(outcome.edgeIndex, outcome.edgeId)).toBe(
+        true
+      );
+      misc.expect.domIndexesMatchBuffer();
+    }
+  });
+
+const registerEmpty = (
+  operation: Operation,
+  opposite: boolean,
+  indexed: boolean,
+  boundary = false
+): void =>
+  makeTest({
+    config: createEmptyConfig(operation, indexed),
+    title:
+      `should ${operation}${boundary ? ' virtually' : ''} to empty datasource` +
+      (indexed ? '' : ' without indexes') +
+      (opposite ? ' (opposite)' : ''),
+    it: misc => async () => {
+      await misc.relaxNext();
+      const golden = (indexed ? indexedEmptyGoldens : unboundedEmptyGoldens)[
+        operation
+      ][Number(opposite)];
+      const items = makeItems(golden.firstId, emptyAmount);
+      if (operation === Adapter.prepend) {
+        items.reverse();
+      }
+
+      expect(misc.getScrollableSize()).toBe(200); // empty ds: scrollable == viewport height
+      expect(misc.adapter.itemsCount).toBe(0);
+      const result = await addItems(misc, operation, items, opposite, boundary);
+      expect(result.success).toBe(true);
+      await misc.adapter.relax();
+
+      expect(misc.adapter.itemsCount).toBe(emptyAmount);
+      expect(misc.adapter.bufferInfo.firstIndex).toBe(golden.firstIndex);
+      expect(misc.adapter.bufferInfo.lastIndex).toBe(golden.lastIndex);
+      expect(misc.checkElementContent(golden.firstIndex, golden.firstId)).toBe(
+        true
+      );
+      expect(
+        misc.checkElementContent(
+          golden.lastIndex,
+          golden.firstId + emptyAmount - 1
+        )
+      ).toBe(true);
+      if (indexed) {
+        expect(misc.getScrollableSize()).toBe(emptyIndexedScrollable);
+        expect(misc.getScrollPosition()).toBe(golden.scrollPosition);
+      }
+      misc.expect.domIndexesMatchBuffer();
+    }
+  });
+
+describe('Adapter Append-Prepend Spec', () =>
+  operations.forEach(operation =>
+    [false, true].forEach(opposite => {
+      registerImmediate(operation, opposite);
+      [false, true].forEach(atEdge =>
+        registerVirtual(operation, opposite, atEdge)
+      );
+      [false, true].forEach(boundary =>
+        registerEmpty(operation, opposite, true, boundary)
+      );
+      registerEmpty(operation, opposite, false);
+    })
+  ));
diff --git a/tests/e2e/specs/adapter.check.spec.ts b/tests/e2e/specs/adapter.check.spec.ts
new file mode 100644
index 00000000..933230ef
--- /dev/null
+++ b/tests/e2e/specs/adapter.check.spec.ts
@@ -0,0 +1,249 @@
+import {
+  getDatasource,
+  makeTest,
+  Misc,
+  SizeStrategy,
+  TestConfig
+} from '../scaffolding';
+
+interface Scenario {
+  min: number;
+  max: number;
+  size: number;
+  itemSize: number;
+  padding: number;
+  bufferSize: number;
+  viewportSize: number;
+  horizontal?: boolean;
+  // Harvested empirically: settled scrollable px after the size change is
+  // absorbed. It depends on vscroll's own measurement, so it is captured, not
+  // derived (deriving it would re-implement the scroller).
+  expectedScrollable: number;
+}
+
+const minIndex = -99;
+const maxIndex = 100;
+
+const scenarios: Scenario[] = [
+  {
+    min: 1,
+    max: 10,
+    size: 10,
+    itemSize: 100,
+    padding: 0.5,
+    bufferSize: 10,
+    viewportSize: 600,
+    expectedScrollable: 14810
+  },
+  {
+    min: 4,
+    max: 5,
+    size: 100,
+    itemSize: 20,
+    padding: 0.88,
+    bufferSize: 10,
+    viewportSize: 300,
+    expectedScrollable: 4788
+  },
+  {
+    min: 2,
+    max: 11,
+    size: 200,
+    itemSize: 20,
+    padding: 0.5,
+    bufferSize: 10,
+    viewportSize: 600,
+    expectedScrollable: 10000
+  },
+  {
+    min: -2,
+    max: 2,
+    size: 20,
+    itemSize: 100,
+    padding: 0.5,
+    bufferSize: 10,
+    viewportSize: 600,
+    expectedScrollable: 17390
+  },
+  {
+    min: 1,
+    max: 2,
+    size: 20,
+    itemSize: 100,
+    padding: 0.33,
+    bufferSize: 5,
+    viewportSize: 450,
+    horizontal: true,
+    expectedScrollable: 18000
+  }
+];
+
+const createConfig = (scenario: Scenario): TestConfig => ({
+  datasource: () => getDatasource({ min: minIndex, max: maxIndex }),
+  datasourceSettings: {
+    startIndex: 1,
+    minIndex,
+    maxIndex,
+    itemSize: scenario.itemSize,
+    padding: scenario.padding,
+    bufferSize: scenario.bufferSize,
+    sizeStrategy: SizeStrategy.Average,
+    ...(scenario.horizontal ? { horizontal: true } : {})
+  },
+  templateSettings: scenario.horizontal
+    ? {
+        viewportWidth: scenario.viewportSize,
+        itemWidth: scenario.itemSize,
+        horizontal: true,
+        dynamicSize: 'size'
+      }
+    : {
+        viewportHeight: scenario.viewportSize,
+        dynamicSize: 'size'
+      },
+  timeout: 9000
+});
+
+const updateElementSize = (misc: Misc, index: number, size: number): void => {
+  const element = misc.getElement(index);
+  if (element) {
+    element.style[misc.horizontal ? 'width' : 'height'] = `${size}px`;
+  }
+};
+
+const updateSizes = (misc: Misc, scenario: Scenario): void => {
+  for (let index = scenario.min; index <= scenario.max; index++) {
+    updateElementSize(misc, index, scenario.size);
+  }
+  misc.setItemProcessor(({ data }) => {
+    data.size =
+      data.id >= scenario.min && data.id <= scenario.max
+        ? scenario.size
+        : scenario.itemSize;
+  });
+};
+
+const getFirstFullyVisibleIndex = (misc: Misc): number => {
+  const edge = misc.getScrollPosition();
+  const element = misc
+    .getElements()
+    .find(item => item[misc.horizontal ? 'offsetLeft' : 'offsetTop'] >= edge);
+  return element ? misc.getElementIndex(element) : NaN;
+};
+
+const expectCheckState = (misc: Misc, expected: boolean): void => {
+  expect(misc.scroller.state.fetch.simulate).toBe(expected);
+  expect(misc.scroller.state.fetch.isCheck).toBe(expected);
+};
+
+const expectSurvivorIdentity = (
+  misc: Misc,
+  before: Misc['scroller']['buffer']['items'],
+  after: Misc['scroller']['buffer']['items']
+): void => {
+  const uidByIndex = new Map(before.map(item => [item.$index, item.uid]));
+  after.forEach(item => {
+    const uid = uidByIndex.get(item.$index);
+    if (uid !== undefined) {
+      expect(item.uid).toBe(uid);
+    }
+  });
+  misc.expect.uniqueItems(after);
+};
+
+const registerCheckScenario = (scenario: Scenario): void =>
+  makeTest({
+    config: createConfig(scenario),
+    title: 'should check changed sizes',
+    before: misc =>
+      misc.setItemProcessor(({ data }) => {
+        data.size = scenario.itemSize;
+      }),
+    it: misc => async () => {
+      await misc.relaxNext();
+      const beforeItems = [...misc.scroller.buffer.items];
+      updateSizes(misc, scenario);
+      const firstVisibleIndex = getFirstFullyVisibleIndex(misc);
+
+      await misc.adapter.check();
+
+      expectSurvivorIdentity(misc, beforeItems, misc.scroller.buffer.items);
+      expect(misc.adapter.firstVisible.$index).toBe(firstVisibleIndex);
+      expect(misc.getScrollableSize()).toBe(scenario.expectedScrollable);
+      misc.expect.domMatchesBuffer();
+    }
+  });
+
+const registerFetchAfterCheck = (scenario: Scenario): void =>
+  makeTest({
+    config: createConfig(scenario),
+    title: 'should fetch after check',
+    before: misc =>
+      misc.setItemProcessor(({ data }) => {
+        data.size = scenario.itemSize;
+      }),
+    it: misc => async () => {
+      await misc.relaxNext();
+      updateElementSize(misc, misc.scroller.settings.startIndex, 50);
+
+      const result = misc.adapter.check();
+      expectCheckState(misc, true);
+      await result;
+      expectCheckState(misc, false);
+      misc.expect.uniqueItems();
+
+      await misc.scrollMaxRelax();
+      misc.expect.domMatchesBuffer();
+    }
+  });
+
+const registerDoubleCheck = (
+  scenario: Scenario,
+  operation: 'append' | 'prepend'
+): void =>
+  makeTest({
+    config: createConfig(scenario),
+    title: `should check after check and ${operation}`,
+    before: misc =>
+      misc.setItemProcessor(({ data }) => {
+        data.size = scenario.itemSize;
+      }),
+    it: misc => async () => {
+      await misc.relaxNext();
+      const startIndex = misc.scroller.settings.startIndex;
+      updateElementSize(misc, startIndex, 50);
+
+      let result = misc.adapter.check();
+      expectCheckState(misc, true);
+      await result;
+      expectCheckState(misc, false);
+      misc.expect.uniqueItems();
+
+      const item = {
+        id: operation === 'prepend' ? minIndex - 1 : maxIndex + 1,
+        text: 'new item',
+        size: scenario.itemSize
+      };
+      if (operation === 'prepend') {
+        await misc.adapter.prepend({ items: [item] });
+      } else {
+        await misc.adapter.append({ items: [item] });
+      }
+      misc.expect.uniqueItems();
+
+      updateElementSize(misc, startIndex, scenario.itemSize);
+      result = misc.adapter.check();
+      expectCheckState(misc, true);
+      await result;
+      expectCheckState(misc, false);
+      misc.expect.uniqueItems();
+    }
+  });
+
+describe('Adapter Check Size Spec', () => {
+  scenarios.forEach(registerCheckScenario);
+  registerFetchAfterCheck(scenarios[1]);
+  registerFetchAfterCheck(scenarios[4]);
+  registerDoubleCheck(scenarios[1], 'prepend');
+  registerDoubleCheck(scenarios[4], 'append');
+});
diff --git a/tests/e2e/specs/adapter.clip.spec.ts b/tests/e2e/specs/adapter.clip.spec.ts
new file mode 100644
index 00000000..e5740b8b
--- /dev/null
+++ b/tests/e2e/specs/adapter.clip.spec.ts
@@ -0,0 +1,229 @@
+import {
+  getDatasource,
+  makeTest,
+  Misc,
+  AdapterClipOptions,
+  TestConfig
+} from '../scaffolding';
+
+interface BaseScenario {
+  startIndex: number;
+  bufferSize: number;
+  padding: number;
+  itemSize: number;
+  viewportSize: number;
+  horizontal?: boolean;
+}
+
+interface ClipSnapshot {
+  range: [number, number];
+  backwardPadding: number;
+  forwardPadding: number;
+  itemsCount: number;
+  firstVisible: number;
+  scrollableSize: number;
+  defaultSize: number;
+}
+
+interface ClipScenario {
+  base: BaseScenario;
+  options?: AdapterClipOptions;
+  expected: ClipSnapshot;
+}
+
+const newItemsCount = 50;
+
+const baseScenarios: BaseScenario[] = [
+  {
+    startIndex: 1,
+    bufferSize: 5,
+    padding: 0.2,
+    itemSize: 20,
+    viewportSize: 100
+  },
+  {
+    startIndex: -158,
+    bufferSize: 11,
+    padding: 0.68,
+    itemSize: 20,
+    viewportSize: 77
+  },
+  {
+    startIndex: 1,
+    bufferSize: 5,
+    padding: 1,
+    itemSize: 100,
+    viewportSize: 450,
+    horizontal: true
+  },
+  {
+    startIndex: -274,
+    bufferSize: 3,
+    padding: 1.22,
+    itemSize: 75,
+    viewportSize: 320,
+    horizontal: true
+  }
+];
+
+const snapshot = (
+  range: [number, number],
+  backwardPadding: number,
+  forwardPadding: number,
+  firstVisible: number,
+  scrollableSize: number,
+  defaultSize: number
+): ClipSnapshot => ({
+  range,
+  backwardPadding,
+  forwardPadding,
+  itemsCount: range[1] - range[0] + 1,
+  firstVisible,
+  scrollableSize,
+  defaultSize
+});
+
+// Each `expected` is the settled post-clip state captured EMPIRICALLY (buffer
+// edges, paddings, scrollable size). Clip is a vscroll heuristic, so these are
+// harvested rather than recomputed.
+const clipScenarios: ClipScenario[] = [
+  {
+    base: baseScenarios[0],
+    expected: snapshot([0, 6], 80, 1000, 1, 1220, 20)
+  },
+  {
+    base: baseScenarios[1],
+    expected: snapshot([-161, -152], 160, 1080, -158, 1440, 20)
+  },
+  {
+    base: baseScenarios[2],
+    expected: snapshot([-4, 9], 0, 5000, 1, 6400, 100)
+  },
+  {
+    base: baseScenarios[3],
+    expected: snapshot([-280, -265], 0, 3750, -274, 4950, 75)
+  },
+  {
+    base: baseScenarios[0],
+    options: { forwardOnly: true },
+    expected: snapshot([-4, 6], 0, 1000, 1, 1220, 20)
+  },
+  {
+    base: baseScenarios[1],
+    options: { backwardOnly: true },
+    expected: snapshot([-161, -98], 160, 0, -158, 1440, 20)
+  },
+  {
+    base: baseScenarios[2],
+    options: { forwardOnly: true },
+    expected: snapshot([-4, 9], 0, 5000, 1, 6400, 100)
+  },
+  {
+    base: baseScenarios[3],
+    options: { backwardOnly: true },
+    expected: snapshot([-280, -215], 0, 0, -274, 4950, 75)
+  },
+  {
+    base: baseScenarios[0],
+    options: { forwardOnly: true, backwardOnly: true },
+    expected: snapshot([0, 6], 80, 1000, 1, 1220, 20)
+  }
+];
+
+const createConfig = (
+  scenario: BaseScenario,
+  infinite = false
+): TestConfig => ({
+  datasource: () => getDatasource(),
+  datasourceSettings: {
+    startIndex: scenario.startIndex,
+    bufferSize: scenario.bufferSize,
+    padding: scenario.padding,
+    itemSize: scenario.itemSize,
+    infinite,
+    ...(scenario.horizontal ? { horizontal: true } : {})
+  },
+  templateSettings: scenario.horizontal
+    ? {
+        viewportWidth: scenario.viewportSize,
+        itemWidth: scenario.itemSize,
+        horizontal: true
+      }
+    : {
+        viewportHeight: scenario.viewportSize,
+        itemHeight: scenario.itemSize
+      }
+});
+
+const takeSnapshot = (misc: Misc): ClipSnapshot => ({
+  range: [
+    misc.adapter.bufferInfo.firstIndex,
+    misc.adapter.bufferInfo.lastIndex
+  ],
+  backwardPadding: misc.padding.backward.getSize(),
+  forwardPadding: misc.padding.forward.getSize(),
+  itemsCount: misc.adapter.itemsCount,
+  firstVisible: misc.adapter.firstVisible.$index,
+  scrollableSize: misc.getScrollableSize(),
+  defaultSize: misc.scroller.buffer.defaultSize
+});
+
+const registerClipScenario = (scenario: ClipScenario): void =>
+  makeTest({
+    config: createConfig(scenario.base),
+    title: 'should clip after appending many items',
+    meta: scenario.options
+      ? Object.keys(scenario.options).join(' + ')
+      : 'both directions',
+    it: misc => async () => {
+      await misc.relaxNext();
+      const { buffer } = misc.scroller;
+      const firstIndex = buffer.firstIndex;
+      const indexToAppend = buffer.lastIndex + 1;
+      const items = Array.from({ length: newItemsCount }, (_, offset) => ({
+        id: indexToAppend - offset,
+        text: `!item #${indexToAppend - offset}`
+      }));
+
+      await misc.adapter.append({ items });
+      expect(buffer.firstIndex).toBe(firstIndex);
+      expect(buffer.lastIndex).toBe(indexToAppend + newItemsCount - 1);
+      expect(misc.padding.backward.getSize()).toBe(0);
+
+      await misc.adapter.clip(scenario.options);
+
+      misc.expect.uniqueItems(buffer.items);
+      expect(takeSnapshot(misc)).toEqual(scenario.expected);
+      misc.expect.domIndexesMatchBuffer();
+    }
+  });
+
+const registerInfiniteScenario = (scenario: BaseScenario): void =>
+  makeTest({
+    config: createConfig(scenario, true),
+    title: 'should clip after scroll in infinite mode',
+    it: misc => async () => {
+      await misc.relaxNext();
+      const initialCount = misc.adapter.itemsCount;
+
+      await misc.scrollMaxRelax();
+      const beforeItems = [...misc.scroller.buffer.items];
+      const expandedCount = misc.adapter.itemsCount;
+      expect(expandedCount).toBeGreaterThan(initialCount);
+
+      await misc.adapter.clip();
+      expect(misc.adapter.itemsCount).toBeLessThan(expandedCount);
+      misc.expect.itemsIdentity(beforeItems, misc.scroller.buffer.items);
+
+      const clipCount = misc.scroller.state.clip.callCount;
+      await misc.scrollMaxRelax();
+      expect(misc.scroller.state.clip.callCount).toBe(clipCount);
+      misc.expect.domIndexesMatchBuffer();
+    }
+  });
+
+describe('Adapter Clip Spec', () => {
+  clipScenarios.forEach(registerClipScenario);
+  registerInfiniteScenario(baseScenarios[0]);
+  registerInfiniteScenario(baseScenarios[3]);
+});
diff --git a/tests/e2e/specs/adapter.insert.spec.ts b/tests/e2e/specs/adapter.insert.spec.ts
new file mode 100644
index 00000000..5f0b8181
--- /dev/null
+++ b/tests/e2e/specs/adapter.insert.spec.ts
@@ -0,0 +1,563 @@
+import {
+  getDatasource,
+  makeItems,
+  makeTest,
+  Misc,
+  MutableDatasource,
+  TestConfig,
+  TestItem
+} from '../scaffolding';
+
+interface InsertScenario {
+  before: boolean;
+  index: number;
+  amount: number;
+  startIndex: number;
+  decrease?: boolean;
+  useIndexApi?: boolean;
+}
+
+interface VirtualScenario extends InsertScenario {
+  expected: { min: number; max: number; ids: number[] };
+}
+
+interface EmptyScenario extends Omit<InsertScenario, 'startIndex'> {
+  expected: {
+    min: number;
+    max: number;
+    start: number;
+    firstVisible?: number;
+    lastVisible?: number;
+  };
+}
+
+interface StateSnapshot {
+  absMin: number;
+  absMax: number;
+  bufferSize: number;
+  scrollableSize: number;
+  indexes: number[];
+  ids: number[];
+}
+
+const min = 1;
+const max = 100;
+const middle = 50;
+const itemSize = 20;
+
+const coreScenarios: InsertScenario[] = [
+  { before: false, index: middle, amount: 3, startIndex: middle },
+  { before: true, index: middle, amount: 3, startIndex: middle },
+  { before: false, index: max, amount: 3, startIndex: max },
+  { before: true, index: min, amount: 3, startIndex: min }
+];
+
+const indexScenarios = [coreScenarios[0], coreScenarios[3]].map(scenario => ({
+  ...scenario,
+  useIndexApi: true
+}));
+
+const staticScenarios = [
+  ...coreScenarios,
+  ...indexScenarios,
+  ...[...coreScenarios, ...indexScenarios].map(scenario => ({
+    ...scenario,
+    decrease: true
+  }))
+];
+
+const outsideScenarios: InsertScenario[] = [
+  { before: false, index: 1, amount: 3, startIndex: middle },
+  { before: false, index: max - 1, amount: 3, startIndex: middle },
+  { before: true, index: 1, amount: 3, startIndex: middle },
+  { before: true, index: max - 1, amount: 3, startIndex: middle }
+];
+
+const dynamicBase = [
+  ...coreScenarios,
+  { ...coreScenarios[0], decrease: true },
+  { ...coreScenarios[1], decrease: true }
+];
+const dynamicScenarios = [
+  ...dynamicBase,
+  ...dynamicBase.map(scenario => ({ ...scenario, useIndexApi: true }))
+];
+
+const virtualScenarios: VirtualScenario[] = [
+  {
+    before: false,
+    index: -3,
+    amount: 2,
+    startIndex: 0,
+    expected: {
+      min: -4,
+      max: 7,
+      ids: [-4, -3, 101, 102, -2, -1, 0, 1, 2, 3, 4, 5]
+    }
+  },
+  {
+    before: false,
+    index: -3,
+    amount: 2,
+    startIndex: 0,
+    decrease: true,
+    expected: {
+      min: -6,
+      max: 5,
+      ids: [-4, -3, 101, 102, -2, -1, 0, 1, 2, 3, 4, 5]
+    }
+  },
+  {
+    before: true,
+    index: -3,
+    amount: 2,
+    startIndex: 0,
+    expected: {
+      min: -4,
+      max: 7,
+      ids: [-4, 101, 102, -3, -2, -1, 0, 1, 2, 3, 4, 5]
+    }
+  },
+  {
+    before: true,
+    index: -3,
+    amount: 2,
+    startIndex: 0,
+    decrease: true,
+    expected: {
+      min: -6,
+      max: 5,
+      ids: [-4, 101, 102, -3, -2, -1, 0, 1, 2, 3, 4, 5]
+    }
+  },
+  {
+    before: false,
+    index: 4,
+    amount: 2,
+    startIndex: 0,
+    expected: {
+      min: -4,
+      max: 7,
+      ids: [-4, -3, -2, -1, 0, 1, 2, 3, 4, 101, 102, 5]
+    }
+  },
+  {
+    before: false,
+    index: 4,
+    amount: 2,
+    startIndex: 0,
+    decrease: true,
+    expected: {
+      min: -6,
+      max: 5,
+      ids: [-4, -3, -2, -1, 0, 1, 2, 3, 4, 101, 102, 5]
+    }
+  },
+  {
+    before: true,
+    index: 4,
+    amount: 2,
+    startIndex: 0,
+    expected: {
+      min: -4,
+      max: 7,
+      ids: [-4, -3, -2, -1, 0, 1, 2, 3, 101, 102, 4, 5]
+    }
+  },
+  {
+    before: true,
+    index: 4,
+    amount: 2,
+    startIndex: 0,
+    decrease: true,
+    expected: {
+      min: -6,
+      max: 5,
+      ids: [-4, -3, -2, -1, 0, 1, 2, 3, 101, 102, 4, 5]
+    }
+  },
+  {
+    before: true,
+    index: -4,
+    amount: 20,
+    startIndex: 0,
+    expected: {
+      min: -4,
+      max: 25,
+      ids: [
+        ...Array.from({ length: 20 }, (_, index) => 101 + index),
+        -4,
+        -3,
+        -2,
+        -1,
+        0,
+        1,
+        2,
+        3,
+        4,
+        5
+      ]
+    }
+  },
+  {
+    before: false,
+    index: 5,
+    amount: 20,
+    startIndex: 0,
+    decrease: true,
+    expected: {
+      min: -24,
+      max: 5,
+      ids: [
+        -4,
+        -3,
+        -2,
+        -1,
+        0,
+        1,
+        2,
+        3,
+        4,
+        5,
+        ...Array.from({ length: 20 }, (_, index) => 101 + index)
+      ]
+    }
+  }
+];
+
+const emptyScenarios: EmptyScenario[] = [
+  {
+    before: false,
+    index: 0,
+    amount: 5,
+    expected: { min: 1, max: 5, start: 1, firstVisible: 1 }
+  },
+  {
+    before: true,
+    index: 2,
+    amount: 5,
+    expected: { min: 1, max: 5, start: 1, firstVisible: 1 }
+  },
+  {
+    before: false,
+    index: 5,
+    amount: 5,
+    decrease: true,
+    expected: { min: 1, max: 5, start: 1, firstVisible: 1 }
+  },
+  {
+    before: true,
+    index: 6,
+    amount: 5,
+    decrease: true,
+    expected: { min: 1, max: 5, start: 1, firstVisible: 1 }
+  },
+  {
+    before: false,
+    index: -10,
+    amount: 20,
+    expected: { min: -9, max: 10, start: 1, firstVisible: 1 }
+  },
+  {
+    before: false,
+    index: 100,
+    amount: 10,
+    expected: { min: 101, max: 110, start: 101, firstVisible: 101 }
+  },
+  {
+    before: false,
+    index: -100,
+    amount: 10,
+    expected: { min: -99, max: -90, start: -90, lastVisible: -90 }
+  }
+];
+
+const createConfig = (scenario: InsertScenario): TestConfig => ({
+  datasource: () => new MutableDatasource(min, max),
+  datasourceSettings: {
+    startIndex: scenario.startIndex,
+    minIndex: min,
+    maxIndex: max,
+    bufferSize: 10,
+    padding: 0.5,
+    itemSize
+  },
+  templateSettings: { viewportHeight: 200, itemHeight: itemSize },
+  timeout: 4000
+});
+
+const createVirtualConfig = (): TestConfig => ({
+  datasource: () => new MutableDatasource(-4, 5),
+  datasourceSettings: {
+    minIndex: -4,
+    maxIndex: 5,
+    startIndex: 0,
+    padding: 0.1,
+    bufferSize: 1,
+    itemSize
+  },
+  templateSettings: { viewportHeight: 60, itemHeight: itemSize },
+  timeout: 4000
+});
+
+const emptyConfig: TestConfig = {
+  datasource: () => getDatasource({ min: 1, max: 0 }),
+  datasourceSettings: {
+    minIndex: -15,
+    maxIndex: 15,
+    startIndex: 1,
+    padding: 0.1,
+    bufferSize: 7,
+    itemSize
+  },
+  templateSettings: { viewportHeight: 100, itemHeight: itemSize }
+};
+
+const takeSnapshot = (misc: Misc): StateSnapshot => ({
+  absMin: misc.scroller.buffer.absMinIndex,
+  absMax: misc.scroller.buffer.absMaxIndex,
+  bufferSize: misc.scroller.buffer.size,
+  scrollableSize: misc.getScrollableSize(),
+  indexes: misc.scroller.buffer.items.map(item => item.$index),
+  ids: misc.scroller.buffer.items.map(item => item.data.id)
+});
+
+const insertViaAdapter = (
+  misc: Misc,
+  scenario: Pick<
+    InsertScenario,
+    'before' | 'index' | 'decrease' | 'useIndexApi'
+  >,
+  items: TestItem[]
+) =>
+  misc.adapter.insert({
+    items,
+    decrease: !!scenario.decrease,
+    ...(scenario.useIndexApi
+      ? scenario.before
+        ? { beforeIndex: scenario.index }
+        : { afterIndex: scenario.index }
+      : scenario.before
+        ? { before: ({ $index }) => $index === scenario.index }
+        : { after: ({ $index }) => $index === scenario.index })
+  });
+
+const expectStaticResult = (
+  before: StateSnapshot,
+  misc: Misc,
+  scenario: InsertScenario,
+  inserted: boolean
+): void => {
+  const after = takeSnapshot(misc);
+  if (!inserted) {
+    expect(after).toEqual(before);
+    return;
+  }
+
+  const items = makeItems(max + 1, scenario.amount);
+  const expectedIds = [...before.ids];
+  const anchor = expectedIds.indexOf(scenario.index);
+  expectedIds.splice(
+    anchor + (scenario.before ? 0 : 1),
+    0,
+    ...items.map(item => item.id)
+  );
+  const firstIndex =
+    before.indexes[0] - (scenario.decrease ? scenario.amount : 0);
+
+  expect(after.absMin).toBe(
+    before.absMin - (scenario.decrease ? scenario.amount : 0)
+  );
+  expect(after.absMax).toBe(
+    before.absMax + (scenario.decrease ? 0 : scenario.amount)
+  );
+  expect(after.bufferSize).toBe(before.bufferSize + scenario.amount);
+  expect(after.scrollableSize).toBe(
+    before.scrollableSize + scenario.amount * itemSize
+  );
+  expect(after.indexes).toEqual(
+    Array.from({ length: after.bufferSize }, (_, offset) => firstIndex + offset)
+  );
+  expect(after.ids).toEqual(expectedIds);
+};
+
+const runBufferedInsert = async (
+  misc: Misc,
+  scenario: InsertScenario,
+  shouldInsert: boolean
+): Promise<StateSnapshot> => {
+  await misc.relaxNext();
+  const items = makeItems(max + 1, scenario.amount);
+  const datasource = misc.source<MutableDatasource>();
+  datasource.insert(
+    items,
+    scenario.index,
+    scenario.before,
+    !!scenario.decrease
+  );
+  const before = takeSnapshot(misc);
+
+  const resultPromise = insertViaAdapter(misc, scenario, items);
+  if (shouldInsert) {
+    expect(misc.adapter.isLoading).toBe(true);
+  }
+  const result = await resultPromise;
+
+  expect(result.success).toBe(true);
+  expect(result.immediate).toBe(!shouldInsert);
+  expect(misc.adapter.isLoading).toBe(false);
+  expectStaticResult(before, misc, scenario, shouldInsert);
+  misc.expect.uniqueItems();
+  misc.expect.domIndexesMatchBuffer();
+  return before;
+};
+
+const registerStatic = (
+  scenario: InsertScenario,
+  shouldInsert: boolean
+): void =>
+  makeTest({
+    config: createConfig(scenario),
+    title: shouldInsert ? 'should insert into the buffer' : 'should not insert',
+    meta:
+      `${scenario.before ? 'before' : 'after'} ${scenario.index}` +
+      (scenario.decrease ? ', decrease' : '') +
+      (scenario.useIndexApi ? ', index API' : ''),
+    it: misc => async () => {
+      await runBufferedInsert(misc, scenario, shouldInsert);
+    }
+  });
+
+const registerDynamic = (scenario: InsertScenario): void =>
+  makeTest({
+    config: createConfig(scenario),
+    title: 'should persist insertion after scrolling',
+    meta:
+      `${scenario.before ? 'before' : 'after'} ${scenario.index}` +
+      (scenario.decrease ? ', decrease' : '') +
+      (scenario.useIndexApi ? ', index API' : ''),
+    it: misc => async () => {
+      await runBufferedInsert(misc, scenario, true);
+      const datasource = misc.source<MutableDatasource>();
+
+      if (misc.getScrollPosition() !== 0) {
+        await misc.scrollMinRelax();
+      }
+      await misc.scrollMaxRelax();
+      datasource.clearRequests();
+      await misc.scrollMinRelax();
+
+      expect(datasource.requests[0]?.index).toBe(
+        min - (scenario.decrease ? scenario.amount : 0)
+      );
+      expect(misc.adapter.bufferInfo.absMinIndex).toBe(
+        min - (scenario.decrease ? scenario.amount : 0)
+      );
+      expect(misc.adapter.bufferInfo.absMaxIndex).toBe(
+        max + (scenario.decrease ? 0 : scenario.amount)
+      );
+      misc.expect.domIndexesMatchBuffer();
+    }
+  });
+
+const registerVirtual = (scenario: VirtualScenario): void =>
+  makeTest({
+    config: createVirtualConfig(),
+    title: 'should insert virtually and preserve it at both edges',
+    meta:
+      `${scenario.before ? 'before' : 'after'} ${scenario.index}` +
+      (scenario.decrease ? ', decrease' : ''),
+    it: misc => async () => {
+      await misc.relaxNext();
+      const items = makeItems(max + 1, scenario.amount);
+      const beforeItems = [...misc.scroller.buffer.items];
+      const firstVisibleId = misc.adapter.firstVisible.data.id;
+      misc.source<MutableDatasource>().insert(
+        items,
+        scenario.index,
+        scenario.before,
+        !!scenario.decrease
+      );
+
+      await insertViaAdapter(misc, { ...scenario, useIndexApi: true }, items);
+
+      misc.expect.itemsIdentity(beforeItems, misc.scroller.buffer.items);
+      expect(misc.adapter.firstVisible.data.id).toBe(firstVisibleId);
+      expect(misc.getScrollableSize()).toBe(
+        (scenario.expected.max - scenario.expected.min + 1) * itemSize
+      );
+
+      await misc.scrollToIndexRelax(scenario.expected.min, 25);
+      expect(misc.scroller.buffer.absMinIndex).toBe(scenario.expected.min);
+      expect(misc.scroller.buffer.minIndex).toBe(scenario.expected.min);
+      misc.scroller.buffer.items.forEach((item, index) =>
+        expect(item.data.id).toBe(scenario.expected.ids[index])
+      );
+
+      await misc.scrollToIndexRelax(scenario.expected.max);
+      expect(misc.scroller.buffer.absMaxIndex).toBe(scenario.expected.max);
+      expect(misc.scroller.buffer.maxIndex).toBe(scenario.expected.max);
+      [...misc.scroller.buffer.items]
+        .reverse()
+        .forEach((item, index) =>
+          expect(item.data.id).toBe(
+            scenario.expected.ids[scenario.expected.ids.length - index - 1]
+          )
+        );
+      misc.expect.domIndexesMatchBuffer();
+    }
+  });
+
+const registerEmpty = (scenario: EmptyScenario): void =>
+  makeTest({
+    config: emptyConfig,
+    title: 'should insert into an empty datasource',
+    meta:
+      `${scenario.before ? 'before' : 'after'} ${scenario.index}` +
+      (scenario.decrease ? ', decrease' : ''),
+    it: misc => async () => {
+      await misc.relaxNext();
+      expect(misc.scroller.buffer.size).toBe(0);
+      const items = makeItems(max + 1, scenario.amount);
+
+      await insertViaAdapter(misc, { ...scenario, useIndexApi: true }, items);
+
+      const { buffer } = misc.scroller;
+      const expected = scenario.expected;
+      expect(misc.getScrollableSize()).toBe(
+        Math.max((expected.max - expected.min + 1) * itemSize, 100)
+      );
+      if (expected.firstVisible !== undefined) {
+        expect(misc.adapter.firstVisible.$index).toBe(expected.firstVisible);
+      }
+      if (expected.lastVisible !== undefined) {
+        expect(misc.adapter.lastVisible.$index).toBe(expected.lastVisible);
+      }
+      expect(buffer.startIndex).toBe(expected.start);
+      expect(buffer.absMinIndex).toBe(expected.min);
+      expect(buffer.minIndex).toBe(expected.min);
+      expect(buffer.firstIndex).toBe(expected.min);
+      expect(buffer.absMaxIndex).toBe(expected.max);
+      expect(buffer.maxIndex).toBe(expected.max);
+      expect(buffer.lastIndex).toBe(expected.max);
+      expect(buffer.items.map(item => item.data.id)).toEqual(
+        items.map(item => item.id)
+      );
+      misc.expect.domIndexesMatchBuffer();
+    }
+  });
+
+describe('Adapter Insert Spec', () => {
+  describe('Buffer', () => {
+    staticScenarios.forEach(scenario => registerStatic(scenario, true));
+    outsideScenarios.forEach(scenario => registerStatic(scenario, false));
+  });
+
+  describe('Persistence after scroll', () =>
+    dynamicScenarios.forEach(registerDynamic));
+
+  describe('Virtual insertion', () =>
+    virtualScenarios.forEach(registerVirtual));
+
+  describe('Empty datasource', () => emptyScenarios.forEach(registerEmpty));
+});
diff --git a/tests/e2e/specs/adapter.pause.spec.ts b/tests/e2e/specs/adapter.pause.spec.ts
new file mode 100644
index 00000000..ca5f41a8
--- /dev/null
+++ b/tests/e2e/specs/adapter.pause.spec.ts
@@ -0,0 +1,125 @@
+import {
+  AdapterMethodResult,
+  AdapterPropName as Adapter,
+  makeTest,
+  Misc
+} from '../scaffolding';
+
+interface BlockedCall {
+  method: Adapter;
+  invoke: (misc: Misc) => Promise<AdapterMethodResult>;
+}
+
+const pausedResult: AdapterMethodResult = {
+  success: true,
+  immediate: true,
+  details: 'Scroller is paused'
+};
+
+const blockedCalls: BlockedCall[] = [
+  { method: Adapter.reload, invoke: misc => misc.adapter.reload() },
+  { method: Adapter.clip, invoke: misc => misc.adapter.clip() },
+  {
+    method: Adapter.fix,
+    invoke: misc => misc.adapter.fix({ scrollPosition: 0 })
+  },
+  { method: Adapter.pause, invoke: misc => misc.adapter.pause() }
+];
+
+const attemptScroll = async (misc: Misc, position: number): Promise<void> => {
+  const cyclesDone = misc.workflow.cyclesDone;
+  misc.viewportElement.scrollTop = position;
+  misc.viewportElement.dispatchEvent(new Event('scroll'));
+  await misc.waitForPaint();
+
+  expect(misc.workflow.cyclesDone).toBe(cyclesDone);
+  expect(misc.adapter.isLoading).toBe(false);
+};
+
+const expectBlocked = async (
+  misc: Misc,
+  scenario: BlockedCall
+): Promise<void> => {
+  const cyclesDone = misc.workflow.cyclesDone;
+  const result = await scenario.invoke(misc);
+
+  expect(result, `${scenario.method} should be blocked`).toEqual(pausedResult);
+  expect(misc.workflow.cyclesDone).toBe(cyclesDone);
+  expect(misc.adapter.isLoading).toBe(false);
+};
+
+describe('Adapter Pause/Resume Spec', () => {
+  makeTest({
+    title: 'should pause & resume',
+    config: {},
+    it: misc => async () => {
+      const { adapter, workflow } = misc;
+      let reactivePaused = adapter.paused;
+      const offPaused = adapter.paused$.on(value => (reactivePaused = value));
+
+      await misc.relaxNext();
+      const lastVisibleIndex = adapter.lastVisible.$index;
+      const maxIndex = adapter.bufferInfo.maxIndex;
+
+      expect(workflow.cyclesDone).toBe(1);
+      expect(adapter.paused).toBe(false);
+      expect(reactivePaused).toBe(false);
+
+      const pauseResult = await adapter.pause();
+      expect(pauseResult).toMatchObject({ success: true, immediate: true });
+      expect(adapter.paused).toBe(true);
+      expect(reactivePaused).toBe(true);
+
+      const relaxResult = await adapter.relax();
+      expect(relaxResult).toMatchObject({ success: true, immediate: true });
+
+      await attemptScroll(misc, 0);
+      await attemptScroll(misc, 9999);
+      for (const scenario of blockedCalls) {
+        await expectBlocked(misc, scenario);
+      }
+
+      expect(workflow.cyclesDone).toBe(1);
+      expect(adapter.lastVisible.$index).toBe(lastVisibleIndex);
+      expect(adapter.bufferInfo.maxIndex).toBe(maxIndex);
+
+      const resumeResult = await adapter.resume();
+      expect(resumeResult).toMatchObject({ success: true, immediate: false });
+      expect(adapter.paused).toBe(false);
+      expect(reactivePaused).toBe(false);
+      expect(workflow.cyclesDone).toBe(2);
+      expect(adapter.lastVisible.$index).toBe(maxIndex);
+      expect(adapter.bufferInfo.maxIndex).toBeGreaterThan(maxIndex);
+
+      await misc.scrollMaxRelax();
+      expect(workflow.cyclesDone).toBe(3);
+      await adapter.reload();
+      expect(workflow.cyclesDone).toBe(4);
+
+      offPaused();
+    }
+  });
+
+  makeTest({
+    title: 'should allow reset while paused',
+    config: {},
+    it: misc => async () => {
+      await misc.relaxNext();
+      expect(misc.workflow.cyclesDone).toBe(1);
+
+      await misc.adapter.pause();
+      await expectBlocked(misc, blockedCalls[0]);
+      expect(misc.workflow.cyclesDone).toBe(1);
+      expect(misc.adapter.paused).toBe(true);
+
+      await misc.adapter.reset();
+      expect(misc.workflow.cyclesDone).toBe(2);
+      expect(misc.adapter.paused).toBe(false);
+
+      await misc.scrollMaxRelax();
+      expect(misc.workflow.cyclesDone).toBe(3);
+      await misc.adapter.reload();
+      expect(misc.workflow.cyclesDone).toBe(4);
+    }
+  });
+});
diff --git a/tests/e2e/specs/adapter.prepend.spec.ts b/tests/e2e/specs/adapter.prepend.spec.ts
new file mode 100644
index 00000000..e77a7f49
--- /dev/null
+++ b/tests/e2e/specs/adapter.prepend.spec.ts
@@ -0,0 +1,165 @@
+import {
+  makeItem,
+  makeItems,
+  makeTest,
+  Misc,
+  MutableDatasource,
+  TestConfig
+} from '../scaffolding';
+
+const min = -40;
+const max = 40;
+const virtualAmount = 10;
+
+// `prependOne` / `prependMany` run against the default unbounded datasource
+// (these configs set no `datasource`); only the virtual cases below build a
+// bounded MutableDatasource.
+const configs: TestConfig[] = [
+  {
+    datasourceSettings: {
+      startIndex: 100,
+      bufferSize: 4,
+      padding: 0.22,
+      itemSize: 20
+    },
+    templateSettings: { viewportHeight: 71, itemHeight: 20 }
+  },
+  {
+    datasourceSettings: {
+      startIndex: 1,
+      bufferSize: 5,
+      padding: 0.2,
+      itemSize: 20
+    },
+    templateSettings: { viewportHeight: 100 }
+  },
+  {
+    datasourceSettings: {
+      startIndex: -15,
+      bufferSize: 12,
+      padding: 0.98,
+      itemSize: 20
+    },
+    templateSettings: { viewportHeight: 66, itemHeight: 20 }
+  },
+  {
+    datasourceSettings: {
+      startIndex: 1,
+      bufferSize: 5,
+      padding: 1,
+      horizontal: true,
+      itemSize: 100
+    },
+    templateSettings: { viewportWidth: 450, itemWidth: 100, horizontal: true }
+  },
+  {
+    datasourceSettings: {
+      startIndex: -74,
+      bufferSize: 4,
+      padding: 0.72,
+      horizontal: true,
+      itemSize: 75
+    },
+    templateSettings: { viewportWidth: 300, itemWidth: 75, horizontal: true }
+  }
+];
+
+const manyConfigs = [configs[1], configs[4]];
+
+const virtualConfigs = [configs[0], configs[3]].map<TestConfig>(config => ({
+  ...config,
+  datasource: () => new MutableDatasource(min, max),
+  datasourceSettings: {
+    ...config.datasourceSettings,
+    minIndex: min,
+    maxIndex: max,
+    startIndex: 10
+  },
+  timeout: 4000
+}));
+
+const prependOne = (misc: Misc) => async () => {
+  await misc.relaxNext();
+  const index = misc.adapter.bufferInfo.firstIndex - 1;
+
+  await misc.adapter.prepend({ items: [makeItem(index)] });
+
+  expect(misc.padding.backward.getSize()).toBe(0);
+  expect(misc.adapter.bufferInfo.firstIndex).toBe(index);
+  expect(misc.checkElementContentByIndex(index)).toBe(true);
+};
+
+const prependMany = (misc: Misc) => async () => {
+  await misc.relaxNext();
+  const amount = 50;
+  const lastIndex = misc.adapter.bufferInfo.firstIndex - 1;
+  const firstIndex = lastIndex - amount + 1;
+  const items = makeItems(firstIndex, amount).reverse();
+
+  await misc.adapter.prepend({ items });
+
+  expect(misc.padding.backward.getSize()).toBe(0);
+  expect(misc.adapter.bufferInfo.firstIndex).toBe(firstIndex);
+  expect(misc.checkElementContentByIndex(firstIndex)).toBe(true);
+};
+
+const registerVirtual = (config: TestConfig, increase: boolean): void =>
+  makeTest({
+    config,
+    title: `should prepend virtually${increase ? ' (increase)' : ''}`,
+    it: misc => async () => {
+      await misc.relaxNext();
+      const itemSize = misc.scroller.settings.itemSize;
+      const newMin = increase ? min : min - virtualAmount;
+      const newMax = increase ? max + virtualAmount : max;
+      const firstId = min - virtualAmount;
+      const items = makeItems(firstId, virtualAmount);
+      const { buffer } = misc.scroller;
+      const before = {
+        firstIndex: buffer.firstIndex,
+        lastIndex: buffer.lastIndex,
+        backwardPadding: misc.padding.backward.getSize(),
+        forwardPadding: misc.padding.forward.getSize()
+      };
+
+      misc.source<MutableDatasource>().reset(newMin, newMax, firstId);
+      await misc.adapter.prepend({ items, bof: true, increase });
+
+      expect(misc.getScrollableSize()).toBe((newMax - newMin + 1) * itemSize);
+      expect(misc.padding.backward.getSize()).toBe(
+        before.backwardPadding + virtualAmount * itemSize
+      );
+      expect(misc.padding.forward.getSize()).toBe(before.forwardPadding);
+      expect(buffer.absMinIndex).toBe(newMin);
+      expect(buffer.absMaxIndex).toBe(newMax);
+      expect(buffer.firstIndex).toBe(
+        before.firstIndex + (increase ? virtualAmount : 0)
+      );
+      expect(buffer.lastIndex).toBe(
+        before.lastIndex + (increase ? virtualAmount : 0)
+      );
+
+      await misc.scrollToIndexRelax(newMax, 30);
+      await misc.scrollToIndexRelax(newMin, 30);
+
+      expect(misc.getScrollableSize()).toBe((newMax - newMin + 1) * itemSize);
+      expect(buffer.absMinIndex).toBe(newMin);
+      expect(buffer.absMaxIndex).toBe(newMax);
+      expect(buffer.firstIndex).toBe(newMin);
+      expect(misc.checkElementContent(newMin, firstId)).toBe(true);
+    }
+  });
+
+describe('Adapter Prepend Spec', () => {
+  configs.forEach(config =>
+    makeTest({ config, title: 'should prepend', it: prependOne })
+  );
+
+  manyConfigs.forEach(config =>
+    makeTest({ config, title: 'should prepend many', it: prependMany })
+  );
+
+  [false, true].forEach(increase =>
+    virtualConfigs.forEach(config => registerVirtual(config, increase))
+  );
+});
diff --git a/tests/e2e/specs/adapter.reload.spec.ts b/tests/e2e/specs/adapter.reload.spec.ts
new file mode 100644
index 00000000..5a64d26d
--- /dev/null
+++ b/tests/e2e/specs/adapter.reload.spec.ts
@@ -0,0 +1,365 @@
+import { getDatasource, makeTest, Misc, TestConfig } from '../scaffolding';
+
+interface ReloadExpectation {
+  index: number | null;
+  interruptions: number;
+  reloads: number;
+}
+
+interface FirstVisibleScenario extends ReloadExpectation {
+  threshold: number;
+}
+
+const baseConfigs: TestConfig[] = [
+  {
+    datasource: () => getDatasource({ mode: 'promise' }),
+    datasourceSettings: { startIndex: 100, bufferSize: 5, padding: 0.2 },
+    templateSettings: { viewportHeight: 100 }
+  },
+  {
+    datasource: () => getDatasource({ mode: 'promise' }),
+    datasourceSettings: { startIndex: -50, bufferSize: 4, padding: 0.49 },
+    templateSettings: { viewportHeight: 70 }
+  },
+  {
+    datasource: () => getDatasource({ mode: 'promise' }),
+    datasourceSettings: {
+      startIndex: -33,
+      bufferSize: 5,
+      padding: 0.3,
+      horizontal: true
+    },
+    templateSettings: { viewportWidth: 300, itemWidth: 100, horizontal: true }
+  }
+];
+
+const indexedReloads = [-10, 1255, 2];
+const scrolledReloads = [
+  { index: -20, scrolls: 3 },
+  { index: null, scrolls: 5 },
+  { index: 4, scrolls: 2 }
+];
+const beforeLoadReloads = [-30, null, 12];
+const asyncFetchReloads = [null, 1025, -40];
+const afterAdjustReloads = [10, 365, -14];
+const onRenderReloads = [500, -25, null];
+const syncFetchReloads = [1, 2, 3];
+const firstVisibleReloads: FirstVisibleScenario[] = [
+  { index: 1, threshold: 50, interruptions: 1, reloads: 1 },
+  { index: -50, threshold: -60, interruptions: 1, reloads: 1 },
+  { index: -99, threshold: -55, interruptions: 1, reloads: 1 }
+];
+
+const largeDoubleReloadConfig: TestConfig = {
+  datasource: () => getDatasource({ mode: 'promise' }),
+  datasourceSettings: {
+    startIndex: 1,
+    itemSize: 100,
+    bufferSize: 10,
+    padding: 0.1
+  },
+  templateSettings: { viewportHeight: 600 }
+};
+
+const reload = (misc: Misc, index: number | null) =>
+  index === null ? misc.adapter.reload() : misc.adapter.reload(index);
+
+const expectedStartIndex = (config: TestConfig, index: number | null): number =>
+  index ?? (config.datasourceSettings?.startIndex as number);
+
+const expectReloaded = (
+  misc: Misc,
+  config: TestConfig,
+  expected: ReloadExpectation
+): void => {
+  const startIndex = expectedStartIndex(config, expected.index);
+  const bufferSize = config.datasourceSettings?.bufferSize as number;
+  const firstIndex = startIndex - bufferSize;
+  const nextIndex = firstIndex + bufferSize + 1;
+  const itemsPerViewport = Math.ceil(
+    misc.getViewportSize() / misc.scroller.buffer.defaultSize
+  );
+
+  expect(misc.scroller.buffer.getFirstVisibleItem()?.$index).toBe(firstIndex);
+  expect(misc.checkElementContentByIndex(firstIndex)).toBe(true);
+  expect(misc.checkElementContentByIndex(nextIndex)).toBe(true);
+  expect(misc.adapter.firstVisible.uid).toBeDefined();
+  expect(misc.adapter.lastVisible.uid).toBeDefined();
+  misc.expect.uniqueItems();
+  expect(misc.adapter.firstVisible.$index).toBe(startIndex);
+  expect(misc.adapter.lastVisible.$index).toBe(
+    startIndex + itemsPerViewport - 1
+  );
+  expect(misc.workflow.interruptionCount).toBe(expected.interruptions);
+  expect(misc.scroller.adapter.reloadCount).toBe(expected.reloads);
+};
+
+const registerSettledReload = (
+  config: TestConfig,
+  title: string,
+  index: number | null,
+  scrolls = 0
+): void =>
+  makeTest({
+    config,
+    title,
+    meta: index === null ? 'default index' : `index = ${index}`,
+    it: misc => async () => {
+      misc.trackVisibleItems();
+      await misc.relaxNext();
+      for (let step = 0; step < scrolls; step++) {
+        await misc.scrollMaxRelax();
+      }
+
+      await reload(misc, index);
+
+      expectReloaded(misc, config, {
+        index,
+        interruptions: 0,
+        reloads: 1
+      });
+    }
+  });
+
+const registerBeforeLoad = (config: TestConfig, index: number | null): void =>
+  makeTest({
+    config,
+    title: 'should reload between initial inner loops',
+    meta: index === null ? 'default index' : `index = ${index}`,
+    it: misc => async () => {
+      misc.trackVisibleItems();
+      await misc.captureInnerLoops(1, () => null);
+      const finished = misc.waitForCycles(2);
+
+      await reload(misc, index);
+      await finished;
+      await misc.adapter.relax();
+
+      expectReloaded(misc, config, {
+        index,
+        interruptions: 1,
+        reloads: 1
+      });
+    }
+  });
+
+const registerAsyncFetch = (
+  baseConfig: TestConfig,
+  index: number | null
+): void => {
+  const config: TestConfig = {
+    ...baseConfig,
+    datasource: () => getDatasource({ delay: 150 }),
+    timeout: 5000
+  };
+
+  makeTest({
+    config,
+    title: 'should reload during a pending datasource request',
+    meta: index === null ? 'default index' : `index = ${index}`,
+    it: misc => async () => {
+      misc.trackVisibleItems();
+      await misc.captureInnerLoops(1, () => null);
+      await misc.delay(75);
+      const finished = misc.waitForCycles(2);
+
+      await reload(misc, index);
+      await finished;
+      await misc.adapter.relax();
+
+      expectReloaded(misc, config, {
+        index,
+        interruptions: 1,
+        reloads: 1
+      });
+    }
+  });
+};
+
+const registerBeforeInit = (baseConfig: TestConfig): void => {
+  const config: TestConfig = {
+    ...baseConfig,
+    datasourceDevSettings: { initDelay: 50 }
+  };
+
+  makeTest({
+    config,
+    title: 'should ignore reload before initialization',
+    it: misc => async () => {
+      misc.trackVisibleItems();
+      const result = await misc.adapter.reload();
+      expect(result).toEqual({
+        immediate: true,
+        success: true,
+        details: 'Adapter is not initialized'
+      });
+
+      await misc.waitForAdapterInit();
+      await misc.adapter.relax();
+
+      expect(misc.scroller.state.fetch.cancel).toBeNull();
+      expectReloaded(misc, config, {
+        index: null,
+        interruptions: 0,
+        reloads: 0
+      });
+    }
+  });
+};
+
+const registerDoubleReload = (
+  config: TestConfig,
+  index: number | null,
+  timing: 'after adjust' | 'during render'
+): void =>
+  makeTest({
+    config,
+    title: 'should interrupt the first reload with the second',
+    meta: `${timing}, ${index === null ? 'default index' : `index = ${index}`}`,
+    it: misc => async () => {
+      misc.trackVisibleItems();
+      await misc.relaxNext();
+      const finished = misc.waitForCycles(3);
+      let secondReload: ReturnType<typeof misc.adapter.reload>;
+
+      if (timing === 'after adjust') {
+        let off = () => {};
+        off = misc.scroller.state.cycle.innerLoop.busy.on(pending => {
+          if (!pending) {
+            off();
+            secondReload = reload(misc, index);
+          }
+        });
+      } else {
+        setTimeout(() => (secondReload = reload(misc, index)));
+      }
+
+      const firstReload = misc.adapter.reload(10);
+      await finished;
+      await Promise.all([firstReload, secondReload!]);
+
+      expect(misc.workflow.cyclesDone).toBe(3);
+      expectReloaded(misc, config, {
+        index,
+        interruptions: 1,
+        reloads: 2
+      });
+    }
+  });
+
+const registerSyncFetch = (baseConfig: TestConfig, index: number): void => {
+  const config: TestConfig = {
+    ...baseConfig,
+    datasource: () => getDatasource({ delay: 1 }),
+    timeout: 4000
+  };
+
+  makeTest({
+    config,
+    title: 'should reload from inside datasource.get',
+    meta: `index = ${index}`,
+    it: misc => async () => {
+      misc.trackVisibleItems();
+      let reloadResult: ReturnType<typeof misc.adapter.reload> | undefined;
+      misc.setDatasourceProcessor(() => {
+        reloadResult ??= misc.adapter.reload(index);
+      });
+
+      await misc.waitForCycles(2);
+      await reloadResult;
+
+      expect(misc.workflow.cyclesDone).toBe(2);
+      expectReloaded(misc, config, {
+        index,
+        interruptions: 1,
+        reloads: 1
+      });
+    }
+  });
+};
+
+const registerFirstVisibleReload = (
+  config: TestConfig,
+  scenario: FirstVisibleScenario
+): void =>
+  makeTest({
+    config,
+    title: 'should reload from a firstVisible change',
+    meta: `threshold = ${scenario.threshold}`,
+    it: misc => async () => {
+      misc.trackVisibleItems();
+      let reloadResult: ReturnType<typeof misc.adapter.reload> | undefined;
+      let off = () => {};
+      off = misc.adapter.firstVisible$.on(({ $index }) => {
+        if (
+          reloadResult ||
+          !Number.isFinite($index) ||
+          $index > scenario.threshold
+        ) {
+          return;
+        }
+        off();
+        reloadResult = reload(misc, scenario.index);
+      });
+
+      await misc.relaxNext();
+      while (!reloadResult) {
+        await misc.scrollMinRelax();
+      }
+      await reloadResult;
+
+      expectReloaded(misc, config, scenario);
+    }
+  });
+
+describe('Adapter Reload Spec', () => {
+  describe('Settled reload', () => {
+    baseConfigs.forEach(config =>
+      registerSettledReload(
+        config,
+        'should reload at the initial position',
+        null
+      )
+    );
+    baseConfigs.forEach((config, index) =>
+      registerSettledReload(
+        config,
+        'should reload at the requested position',
+        indexedReloads[index]
+      )
+    );
+    baseConfigs.forEach((config, index) =>
+      registerSettledReload(
+        config,
+        'should reload after scrolling',
+        scrolledReloads[index].index,
+        scrolledReloads[index].scrolls
+      )
+    );
+  });
+
+  describe('Interruption', () => {
+    baseConfigs.forEach((config, index) =>
+      registerBeforeLoad(config, beforeLoadReloads[index])
+    );
+    baseConfigs.forEach((config, index) =>
+      registerAsyncFetch(config, asyncFetchReloads[index])
+    );
+    baseConfigs.forEach((config, index) =>
+      registerDoubleReload(config, afterAdjustReloads[index], 'after adjust')
+    );
+    registerDoubleReload(largeDoubleReloadConfig, 999, 'after adjust');
+    baseConfigs.forEach((config, index) =>
+      registerDoubleReload(config, onRenderReloads[index], 'during render')
+    );
+    baseConfigs.forEach((config, index) =>
+      registerSyncFetch(config, syncFetchReloads[index])
+    );
+    baseConfigs.forEach((config, index) =>
+      registerFirstVisibleReload(config, firstVisibleReloads[index])
+    );
+  });
+
+  describe('Before initialization', () =>
+    baseConfigs.forEach(registerBeforeInit));
+});
diff --git a/tests/e2e/specs/adapter.remove.spec.ts b/tests/e2e/specs/adapter.remove.spec.ts
new file mode 100644
index 00000000..85902c85
--- /dev/null
+++ b/tests/e2e/specs/adapter.remove.spec.ts
@@ -0,0 +1,633 @@
+import {
+  getDynamicSize,
+  makeTest,
+  Misc,
+  MutableDatasource,
+  SizeStrategy,
+  TestConfig
+} from '../scaffolding';
+
+interface RemovalScenario {
+  config: TestConfig;
+  indexes: number[];
+  increase?: boolean;
+  useIndexes?: boolean;
+  byId?: boolean;
+}
+
+interface DynamicScenario {
+  startIndex: number;
+  indexToRemove: number;
+  strategy: SizeStrategy;
+  increase: boolean;
+  reloadIndex?: number;
+}
+
+interface FlushScenario {
+  startIndex: number;
+  maxIndex: number;
+  fixRight: boolean;
+  expectedRange: [number, number];
+  meta: string;
+}
+
+interface MixedScenario {
+  startIndex: number;
+  indexes: number[];
+  increase: boolean;
+  expected: { min: number; max: number };
+  meta: string;
+}
+
+const min = -99;
+const max = 100;
+const itemSize = 20;
+const oversizedItemSize = 100;
+
+const createConfig = (
+  datasourceSettings: NonNullable<TestConfig['datasourceSettings']>,
+  sourceMin = min,
+  sourceMax = max,
+  templateSettings: TestConfig['templateSettings'] = { viewportHeight: 100 }
+): TestConfig => ({
+  datasource: () => new MutableDatasource(sourceMin, sourceMax),
+  datasourceSettings,
+  templateSettings,
+  timeout: 4000
+});
+
+const bufferConfigs = [
+  createConfig({
+    startIndex: 1,
+    bufferSize: 5,
+    padding: 0.2,
+    itemSize
+  }),
+  createConfig({
+    startIndex: 55,
+    bufferSize: 8,
+    padding: 1,
+    itemSize
+  }),
+  createConfig({
+    startIndex: 10,
+    bufferSize: 5,
+    padding: 0.2,
+    itemSize
+  })
+];
+
+const baseRemovals = [
+  [3, 4, 5],
+  [54, 55, 56, 57, 58],
+  [7, 8, 9]
+];
+
+const interruptedRemovals = [
+  [2, 3, 5, 6],
+  [54, 56, 57, 58]
+];
+
+const bufferScenarios: RemovalScenario[] = [
+  ...bufferConfigs.flatMap((config, index) => [
+    { config, indexes: baseRemovals[index] },
+    { config, indexes: baseRemovals[index], byId: true }
+  ]),
+  ...interruptedRemovals.map((indexes, index) => ({
+    config: bufferConfigs[index],
+    indexes
+  })),
+  ...bufferConfigs.map((config, index) => ({
+    config,
+    indexes: baseRemovals[index],
+    increase: true
+  })),
+  {
+    config: bufferConfigs[0],
+    indexes: baseRemovals[0],
+    useIndexes: true
+  },
+  {
+    config: bufferConfigs[1],
+    indexes: interruptedRemovals[1],
+    useIndexes: true
+  },
+  {
+    config: bufferConfigs[2],
+    indexes: baseRemovals[2],
+    increase: true,
+    useIndexes: true
+  }
+];
+
+const virtualConfig = createConfig({
+  startIndex: 1,
+  minIndex: min,
+  maxIndex: max,
+  bufferSize: 5,
+  padding: 0.2,
+  itemSize
+});
+
+const virtualScenarios: RemovalScenario[] = [
+  {
+    config: virtualConfig,
+    indexes: [51, 52, 53, 54, 55],
+    useIndexes: true
+  },
+  {
+    config: virtualConfig,
+    indexes: [-51, -52, -53, -54, -55],
+    useIndexes: true
+  },
+  {
+    config: virtualConfig,
+    indexes: [-51, -52, -53, -54, -55, 51, 52, 53, 54, 55],
+    useIndexes: true
+  }
+];
+
+const dynamicScenarios: DynamicScenario[] = [
+  {
+    startIndex: 10,
+    indexToRemove: 11,
+    strategy: SizeStrategy.Average,
+    increase: false
+  },
+  {
+    startIndex: 11,
+    indexToRemove: 9,
+    strategy: SizeStrategy.Frequent,
+    increase: false
+  },
+  {
+    startIndex: 10,
+    indexToRemove: 11,
+    strategy: SizeStrategy.Average,
+    increase: true
+  },
+  {
+    startIndex: 11,
+    indexToRemove: 9,
+    strategy: SizeStrategy.Frequent,
+    increase: true
+  },
+  {
+    startIndex: 20,
+    indexToRemove: 20,
+    strategy: SizeStrategy.Average,
+    increase: false,
+    reloadIndex: 2
+  },
+  {
+    startIndex: 1,
+    indexToRemove: 1,
+    strategy: SizeStrategy.Frequent,
+    increase: false,
+    reloadIndex: 15
+  },
+  {
+    startIndex: 20,
+    indexToRemove: 20,
+    strategy: SizeStrategy.Average,
+    increase: true,
+    reloadIndex: 2
+  },
+  {
+    startIndex: 1,
+    indexToRemove: 1,
+    strategy: SizeStrategy.Frequent,
+    increase: true,
+    reloadIndex: 15
+  }
+];
+
+const flushScenarios: FlushScenario[] = [
+  {
+    startIndex: 1,
+    maxIndex: 20,
+    fixRight: false,
+    expectedRange: [1, 8],
+    meta: 'BOF'
+  },
+  {
+    startIndex: 1,
+    maxIndex: 15,
+    fixRight: true,
+    expectedRange: [9, 15],
+    meta: 'BOF, 15 items'
+  },
+  {
+    startIndex: 1,
+    maxIndex: 30,
+    fixRight: true,
+    expectedRange: [9, 16],
+    meta: 'BOF, 30 items'
+  },
+  {
+    startIndex: 20,
+    maxIndex: 20,
+    fixRight: false,
+    expectedRange: [5, 12],
+    meta: 'EOF'
+  },
+  {
+    startIndex: 15,
+    maxIndex: 15,
+    fixRight: true,
+    expectedRange: [9, 15],
+    meta: 'EOF, 15 items'
+  },
+  {
+    startIndex: 15,
+    maxIndex: 25,
+    fixRight: true,
+    expectedRange: [18, 25],
+    meta: 'EOF, 25 items'
+  }
+];
+
+const mixedScenarios: MixedScenario[] = [
+  {
+    startIndex: 1,
+    indexes: [1, 20],
+    increase: false,
+    expected: { min: 1, max: 18 },
+    meta: 'forward, edge items'
+  },
+  {
+    startIndex: 1,
+    indexes: [1, 20],
+    increase: true,
+    expected: { min: 3, max: 20 },
+    meta: 'forward, edge items, increase'
+  },
+  {
+    startIndex: 20,
+    indexes: [1, 20],
+    increase: false,
+    expected: { min: 1, max: 18 },
+    meta: 'backward, edge items'
+  },
+  {
+    startIndex: 20,
+    indexes: [1, 20],
+    increase: true,
+    expected: { min: 3, max: 20 },
+    meta: 'backward, edge items, increase'
+  },
+  {
+    startIndex: 1,
+    indexes: [2, 3, 17, 18],
+    increase: false,
+    expected: { min: 1, max: 16 },
+    meta: 'forward, inner items'
+  },
+  {
+    startIndex: 1,
+    indexes: [2, 3, 17, 18],
+    increase: true,
+    expected: { min: 5, max: 20 },
+    meta: 'forward, inner items, increase'
+  },
+  {
+    startIndex: 20,
+    indexes: [2, 3, 17, 18],
+    increase: false,
+    expected: { min: 1, max: 16 },
+    meta: 'backward, inner items'
+  },
+  {
+    startIndex: 20,
+    indexes: [2, 3, 17, 18],
+    increase: true,
+    expected: { min: 5, max: 20 },
+    meta: 'backward, inner items, increase'
+  }
+];
+
+const remove = async (
+  misc: Misc,
+  scenario: Pick<
+    RemovalScenario,
+    'indexes' | 'increase' | 'useIndexes' | 'byId'
+  >
+) => {
+  const { indexes, increase, useIndexes, byId } = scenario;
+  misc.source<MutableDatasource>().remove(indexes, increase);
+  return useIndexes
+    ? misc.adapter.remove({ indexes, increase })
+    : misc.adapter.remove({
+        predicate: item => indexes.includes(byId ? item.data.id : item.$index),
+        increase
+      });
+};
+
+const registerBufferRemoval = (scenario: RemovalScenario): void =>
+  makeTest({
+    config: scenario.config,
+    title: 'should remove buffered items',
+    meta:
+      (scenario.byId
+        ? 'by id'
+        : scenario.useIndexes
+          ? 'indexes API'
+          : 'by index') + (scenario.increase ? ', increase' : ''),
+    it: misc => async () => {
+      await misc.relaxNext();
+      const { buffer } = misc.scroller;
+      const before = {
+        size: buffer.size,
+        minIndex: buffer.minIndex,
+        maxIndex: buffer.maxIndex,
+        absMinIndex: buffer.absMinIndex,
+        absMaxIndex: buffer.absMaxIndex,
+        scrollableSize: misc.getScrollableSize()
+      };
+      const firstLoop = misc.captureInnerLoops(1, () => ({
+        size: buffer.size,
+        minIndex: buffer.minIndex,
+        maxIndex: buffer.maxIndex,
+        absMinIndex: buffer.absMinIndex,
+        absMaxIndex: buffer.absMaxIndex,
+        scrollableSize: misc.getScrollableSize()
+      }));
+
+      await remove(misc, scenario);
+      const [after] = await firstLoop;
+      const count = scenario.indexes.length;
+      const increase = !!scenario.increase;
+
+      expect(after).toEqual({
+        size: before.size - count,
+        minIndex: before.minIndex + (increase ? count : 0),
+        maxIndex: before.maxIndex - (increase ? 0 : count),
+        absMinIndex: before.absMinIndex + (increase ? count : 0),
+        absMaxIndex: before.absMaxIndex - (increase ? 0 : count),
+        scrollableSize: before.scrollableSize - count * itemSize
+      });
+
+      buffer.items.forEach(item => {
+        const shift = scenario.indexes.reduce(
+          (total, removedIndex) =>
+            total +
+            (increase
+              ? item.data.id < removedIndex
+                ? -1
+                : 0
+              : item.data.id > removedIndex
+                ? 1
+                : 0),
+          0
+        );
+        expect(item.data.id).toBe(item.$index + shift);
+      });
+    }
+  });
+
+const registerVirtualRemoval = (scenario: RemovalScenario): void =>
+  makeTest({
+    config: scenario.config,
+    title: 'should remove fixed-size items outside the buffer',
+    meta: scenario.indexes.every(index => index < 0)
+      ? 'backward'
+      : scenario.indexes.every(index => index > 0)
+        ? 'forward'
+        : 'both directions',
+    it: misc => async () => {
+      await misc.relaxNext();
+      const {
+        $index: firstVisibleIndex,
+        uid: firstVisibleUid,
+        data: { id: firstVisibleId }
+      } = misc.adapter.firstVisible;
+      const expectedSize = (max - min + 1 - scenario.indexes.length) * itemSize;
+      const removedBefore = scenario.indexes.filter(
+        index => index < firstVisibleIndex
+      ).length;
+
+      await remove(misc, scenario);
+
+      expect(misc.getScrollableSize()).toBe(expectedSize);
+      expect(misc.adapter.firstVisible.$index).toBe(
+        firstVisibleIndex - removedBefore
+      );
+      expect(misc.adapter.firstVisible.uid).toBe(firstVisibleUid);
+      expect(misc.adapter.firstVisible.data.id).toBe(firstVisibleId);
+      misc.expect.uniqueItems();
+
+      const firstRemoved = Math.min(...scenario.indexes);
+      const previous = firstRemoved - 1;
+      const sortedIndexes = [...scenario.indexes].sort((a, b) => a - b);
+      const gap = sortedIndexes.findIndex(
+        (index, offset) => index !== firstRemoved + offset
+      );
+      const adjacentRemoved = gap < 0 ? sortedIndexes.length : gap;
+      await misc.scrollToRelax((previous - min) * itemSize);
+      expect(misc.adapter.firstVisible.$index).toBe(previous);
+      expect(misc.checkElementContentByIndex(previous)).toBe(true);
+      expect(
+        misc.checkElementContent(firstRemoved, firstRemoved + adjacentRemoved)
+      ).toBe(true);
+
+      await misc.scrollMaxRelax();
+      expect(misc.adapter.lastVisible.$index).toBe(
+        max - scenario.indexes.length
+      );
+      expect(misc.checkElementContent(max - scenario.indexes.length, max)).toBe(
+        true
+      );
+      expect(misc.getScrollableSize()).toBe(expectedSize);
+    }
+  });
+
+const registerDynamicRemoval = (scenario: DynamicScenario): void => {
+  const source = () => {
+    const datasource = new MutableDatasource(1, 20);
+    datasource.setSizes(getDynamicSize);
+    datasource.setSize(scenario.indexToRemove, oversizedItemSize);
+    return datasource;
+  };
+  const config: TestConfig = {
+    datasource: source,
+    datasourceSettings: {
+      startIndex: scenario.startIndex,
+      minIndex: 1,
+      maxIndex: 20,
+      bufferSize: 1,
+      padding: 0.5,
+      sizeStrategy: scenario.strategy
+    },
+    datasourceDevSettings:
+      scenario.reloadIndex === undefined ? {} : { cacheOnReload: true },
+    templateSettings: { viewportHeight: 100, dynamicSize: 'size' },
+    timeout: 4000
+  };
+
+  makeTest({
+    config,
+    title: 'should remove a dynamic-size item',
+    meta:
+      `${scenario.strategy}, ${scenario.reloadIndex === undefined ? 'buffered' : 'virtual'}` +
+      (scenario.increase ? ', increase' : ''),
+    it: misc => async () => {
+      await misc.relaxNext();
+      if (scenario.reloadIndex !== undefined) {
+        await misc.adapter.reload(scenario.reloadIndex);
+      }
+
+      const firstVisibleIndex = misc.adapter.firstVisible.$index;
+      const firstVisibleId = misc.adapter.firstVisible.data.id;
+      const defaultSize = misc.scroller.buffer.defaultSize;
+      misc
+        .source<MutableDatasource>()
+        .remove([scenario.indexToRemove], scenario.increase);
+      await misc.adapter.remove({
+        indexes: [scenario.indexToRemove],
+        increase: scenario.increase
+      });
+
+      const shift = scenario.increase
+        ? Number(scenario.indexToRemove > firstVisibleIndex)
+        : -Number(scenario.indexToRemove < firstVisibleIndex);
+      expect(misc.adapter.firstVisible.$index).toBe(firstVisibleIndex + shift);
+      expect(misc.adapter.firstVisible.data.id).toBe(firstVisibleId);
+      if (scenario.strategy === SizeStrategy.Average) {
+        expect(misc.scroller.buffer.defaultSize).not.toBe(defaultSize);
+      }
+
+      await misc.scrollMinRelax();
+      await misc.scrollToIndexRelax(scenario.increase ? 20 : 19, 30);
+      const remainingSize = Array.from(
+        { length: 20 },
+        (_, offset) => offset + 1
+      )
+        .filter(index => index !== scenario.indexToRemove)
+        .reduce((total, index) => total + getDynamicSize(index), 0);
+      expect(misc.getScrollableSize()).toBe(remainingSize);
+    }
+  });
+};
+
+const registerFlush = (scenario: FlushScenario): void => {
+  const config = createConfig(
+    {
+      startIndex: scenario.startIndex,
+      minIndex: 1,
+      maxIndex: scenario.maxIndex,
+      bufferSize: 1,
+      padding: 0.5
+    },
+    1,
+    scenario.maxIndex
+  );
+
+  makeTest({
+    config,
+    title: 'should continue after removing the entire buffer',
+    meta: scenario.meta + (scenario.fixRight ? ', increase' : ''),
+    it: misc => async () => {
+      await misc.relaxNext();
+      const indexes = misc.scroller.buffer.items.map(item => item.$index);
+
+      misc.source<MutableDatasource>().remove(indexes, scenario.fixRight);
+      await misc.adapter.remove({
+        predicate: _item => true,
+        increase: scenario.fixRight
+      });
+
+      expect(misc.workflow.cyclesDone).toBe(2);
+      expect(misc.scroller.state.cycle.innerLoop.count).toBeGreaterThan(1);
+      misc.expect.bufferRange(scenario.expectedRange);
+    }
+  });
+};
+
+const registerMixedRemoval = (scenario: MixedScenario): void => {
+  const config = createConfig(
+    {
+      startIndex: scenario.startIndex,
+      minIndex: 1,
+      maxIndex: 20,
+      bufferSize: 1,
+      padding: 0.3
+    },
+    1,
+    20
+  );
+
+  makeTest({
+    config,
+    title: 'should remove buffered and virtual items together',
+    meta: scenario.meta,
+    it: misc => async () => {
+      await misc.relaxNext();
+      misc
+        .source<MutableDatasource>()
+        .remove(scenario.indexes, scenario.increase);
+      await misc.adapter.remove({
+        indexes: scenario.indexes,
+        increase: scenario.increase
+      });
+
+      expect(misc.scroller.buffer.absMinIndex).toBe(scenario.expected.min);
+      expect(misc.scroller.buffer.absMaxIndex).toBe(scenario.expected.max);
+    }
+  });
+};
+
+describe('Adapter Remove Spec', () => {
+  describe('Buffer', () => bufferScenarios.forEach(registerBufferRemoval));
+
+  describe('No-op and invalid input', () => {
+    [
+      { predicate: ({ $index }: { $index: number }) => $index > 999 },
+      { indexes: [999] }
+    ].forEach(options =>
+      makeTest({
+        config: bufferConfigs[0],
+        title: 'should not run a cycle when nothing is removed',
+        meta: 'predicate' in options ? 'predicate' : 'indexes',
+        it: misc => async () => {
+          await misc.relaxNext();
+          const innerLoops = misc.innerLoopCount;
+
+          await misc.adapter.remove(options);
+
+          expect(misc.workflow.cyclesDone).toBe(1);
+          expect(misc.innerLoopCount).toBe(innerLoops);
+          expect(misc.workflow.errors).toHaveLength(0);
+        }
+      })
+    );
+
+    [null, () => null, (_item: unknown, _extra: unknown) => null].forEach(
+      predicate =>
+        makeTest({
+          config: bufferConfigs[0],
+          title: 'should reject an invalid predicate',
+          it: misc => async () => {
+            await misc.relaxNext();
+            const innerLoops = misc.innerLoopCount;
+
+            const result = await misc.adapter.remove({
+              predicate: predicate as never
+            });
+
+            expect(result.success).toBe(false);
+            expect(misc.workflow.cyclesDone).toBe(1);
+            expect(misc.innerLoopCount).toBe(innerLoops);
+            expect(misc.workflow.errors).toHaveLength(1);
+            expect(misc.workflow.errors[0].process).toContain('remove');
+          }
+        })
+    );
+  });
+
+  describe('Virtual', () => virtualScenarios.forEach(registerVirtualRemoval));
+  describe('Dynamic size', () =>
+    dynamicScenarios.forEach(registerDynamicRemoval));
+  describe('Flush', () => flushScenarios.forEach(registerFlush));
+  describe('Buffer and virtual', () =>
+    mixedScenarios.forEach(registerMixedRemoval));
+});
diff --git a/tests/e2e/specs/adapter.replace.spec.ts b/tests/e2e/specs/adapter.replace.spec.ts
new file mode 100644
index 00000000..fcb25a64
--- /dev/null
+++ b/tests/e2e/specs/adapter.replace.spec.ts
@@ -0,0 +1,145 @@
+import {
+  makeTest,
+  MutableDatasource,
+  TestConfig,
+  TestItem
+} from '../scaffolding';
+
+type Position = 'first' | 'middle' | 'last';
+
+interface ReplaceScenario {
+  position: Position;
+  indexes: number[];
+  amount: number;
+  fixRight?: boolean;
+}
+
+interface ScenarioGroup {
+  title: string;
+  scenarios: ReplaceScenario[];
+}
+
+const min = 1;
+const max = 100;
+const itemSize = 20;
+
+const oneToOne: ReplaceScenario[] = [
+  { position: 'middle', indexes: [2], amount: 1 },
+  { position: 'first', indexes: [1], amount: 1 },
+  { position: 'last', indexes: [100], amount: 1 }
+];
+
+const manyToOne: ReplaceScenario[] = [
+  { position: 'middle', indexes: [2, 3, 4], amount: 1 },
+  { position: 'first', indexes: [1, 2, 3], amount: 1 },
+  { position: 'last', indexes: [98, 99, 100], amount: 1 }
+];
+
+const manyToMany = [2, 3, 4].flatMap(amount =>
+  manyToOne.map(scenario => ({ ...scenario, amount }))
+);
+
+const groups: ScenarioGroup[] = [
+  { title: 'one-to-one', scenarios: oneToOne },
+  { title: 'many-to-one', scenarios: manyToOne },
+  {
+    title: 'many-to-one, fixRight',
+    scenarios: manyToOne.map(scenario => ({ ...scenario, fixRight: true }))
+  },
+  { title: 'many-to-many', scenarios: manyToMany },
+  {
+    title: 'many-to-many, fixRight',
+    scenarios: [manyToMany[0], manyToMany[5], manyToMany[8]].map(scenario => ({
+      ...scenario,
+      fixRight: true
+    }))
+  }
+];
+
+const createConfig = (scenario: ReplaceScenario): TestConfig => ({
+  datasource: () => new MutableDatasource(min, max),
+  datasourceSettings: {
+    startIndex: scenario.position === 'last' ? max : min,
+    minIndex: min,
+    maxIndex: max,
+    itemSize
+  },
+  templateSettings: { viewportHeight: 120, itemHeight: itemSize }
+});
+
+const makeReplacement = (index: number): TestItem => ({
+  id: index,
+  text: `item #${index} *`
+});
+
+const registerScenario = (scenario: ReplaceScenario, group: string): void =>
+  makeTest({
+    config: createConfig(scenario),
+    title: `should replace ${scenario.position} ${scenario.indexes.length} to ${scenario.amount}`,
+    meta: group,
+    it: misc => async () => {
+      await misc.relaxNext();
+      const removed = scenario.indexes.length;
+      const delta = scenario.amount - removed;
+      const firstIndex = scenario.indexes[0] - (scenario.fixRight ? delta : 0);
+      const lastIndex = firstIndex + scenario.amount - 1;
+      const absMinIndex = min - (scenario.fixRight ? delta : 0);
+      const items = Array.from({ length: scenario.amount }, (_, offset) =>
+        makeReplacement(firstIndex + offset)
+      );
+      const scrollableSize = misc.getScrollableSize();
+
+      misc
+        .source<MutableDatasource>()
+        .replace(scenario.indexes, items, scenario.fixRight);
+      await misc.adapter.replace({
+        predicate: ({ $index }) => scenario.indexes.includes($index),
+        items,
+        fixRight: scenario.fixRight
+      });
+
+      await misc.scrollMinMaxRelax();
+      const position =
+        scenario.position === 'last'
+          ? misc.getScrollableSize() - misc.getViewportSize()
+          : (firstIndex - absMinIndex) * itemSize;
+      if (misc.getScrollPosition() !== position) {
+        await misc.scrollToRelax(position);
+      }
+
+      if (scenario.position === 'last') {
+        expect(misc.adapter.lastVisible.$index).toBe(lastIndex);
+      } else {
+        expect(misc.adapter.firstVisible.$index).toBe(firstIndex);
+      }
+      expect(misc.getElementText(firstIndex)).toBe(
+        `${firstIndex}: ${items[0].text}`
+      );
+      expect(misc.getElementText(lastIndex)).toBe(
+        `${lastIndex}: ${items[items.length - 1].text}`
+      );
+
+      // The neighbor is the untouched original item just outside the replaced
+      // range (before it for 'last', after it otherwise). Its id is its original
+      // datasource id: unchanged on the pinned side, but shifted by `delta` on the
+      // side that absorbs the size change (min when fixRight, max otherwise).
+      const neighborIndex =
+        scenario.position === 'last' ? firstIndex - 1 : lastIndex + 1;
+      const neighborId =
+        scenario.position === 'last'
+          ? firstIndex - (scenario.fixRight ? 1 - delta : 1)
+          : lastIndex + (scenario.fixRight ? 1 : 1 - delta);
+      expect(misc.checkElementContent(neighborIndex, neighborId)).toBe(true);
+      expect(misc.getScrollableSize()).toBe(scrollableSize + delta * itemSize);
+      misc.expect.uniqueItems();
+    }
+  });
+
+describe('Adapter Replace Spec', () =>
+  groups.forEach(group =>
+    describe(group.title, () =>
+      group.scenarios.forEach(scenario =>
+        registerScenario(scenario, group.title)
+      )
+    )
+  ));
diff --git a/tests/e2e/specs/adapter.reset-persistence.spec.ts b/tests/e2e/specs/adapter.reset-persistence.spec.ts
new file mode 100644
index 00000000..5b4f12c6
--- /dev/null
+++ b/tests/e2e/specs/adapter.reset-persistence.spec.ts
@@ -0,0 +1,248 @@
+import {
+  AdapterPropName as Adapter,
+  getDefaultAdapterProps,
+  getDatasource,
+  makeDatasource,
+  makeTest,
+  Misc,
+  starGet,
+  DatasourceGet,
+  IDatasourceOptional,
+  TestConfig
+} from '../scaffolding';
+
+interface ResetVariant {
+  isNew: boolean;
+  options: IDatasourceOptional;
+}
+
+type PermanentProp = Adapter.id | Adapter.version;
+
+const Datasource = makeDatasource();
+const adapterProps = getDefaultAdapterProps();
+
+const mainConfig: TestConfig = {
+  datasource: () => getDatasource({ mode: 'promise' }),
+  datasourceSettings: { startIndex: 1 },
+  datasourceDevSettings: { initDelay: 10 },
+  templateSettings: { viewportHeight: 100 }
+};
+
+const bofConfig: TestConfig = {
+  datasource: () => getDatasource({ min: 1, max: 100 }),
+  datasourceSettings: { startIndex: 1, bufferSize: 25 },
+  datasourceDevSettings: { initDelay: 10 },
+  templateSettings: { viewportHeight: 100 }
+};
+
+const workflowConfig: TestConfig = {
+  datasource: () => getDatasource({ delay: 150 }),
+  datasourceSettings: { startIndex: 1 },
+  templateSettings: { viewportHeight: 100 },
+  timeout: 5000
+};
+
+const variants: ResetVariant[] = [
+  {
+    isNew: true,
+    options: { get: starGet, settings: { startIndex: 100 } }
+  },
+  {
+    isNew: false,
+    options: { get: starGet, settings: { startIndex: 100 } }
+  }
+];
+
+const bofVariants: ResetVariant[] = [
+  { isNew: true, options: { settings: { startIndex: 1 } } },
+  { isNew: false, options: { settings: { startIndex: 1 } } }
+];
+
+const reset = (misc: Misc, variant: ResetVariant) => {
+  if (!variant.isNew) {
+    return misc.adapter.reset(variant.options);
+  }
+
+  const datasource = new Datasource<unknown>({
+    get:
+      variant.options.get ??
+      (misc.datasource.get as unknown as DatasourceGet<unknown>),
+    settings: variant.options.settings,
+    devSettings: variant.options.devSettings
+  });
+  return misc.adapter.reset(datasource).finally(() => datasource.dispose());
+};
+
+const expectAdaptersLinked = (
+  misc: Misc,
+  publicAdapter = misc.adapter
+): void => {
+  expect(misc.datasource.adapter).toBe(publicAdapter);
+  expect(misc.scroller.datasource.adapter).toBe(publicAdapter);
+  expect(misc.adapter).toBe(publicAdapter);
+};
+
+const adapters = (misc: Misc) => [
+  misc.adapter,
+  misc.scroller.datasource.adapter,
+  misc.scroller.adapter
+];
+
+const registerPermanentProp = (
+  token: PermanentProp,
+  variant: ResetVariant
+): void =>
+  makeTest({
+    config: mainConfig,
+    title: `should persist ${token}`,
+    meta: variant.isNew ? 'new datasource' : 'partial datasource',
+    it: misc => async () => {
+      const publicAdapter = misc.adapter;
+      const value = misc.scroller.adapter[token];
+      const definition = adapterProps.find(prop => prop.name === token);
+
+      expect(value).toBeTruthy();
+      expect(definition?.permanent).toBe(true);
+      expect(definition?.value).toBeFalsy();
+      expectAdaptersLinked(misc, publicAdapter);
+
+      await misc.relaxNext();
+      expect(misc.scroller.adapter[token]).toBe(value);
+      await reset(misc, variant);
+
+      expectAdaptersLinked(misc, publicAdapter);
+      expect(misc.scroller.adapter[token]).toBe(value);
+    }
+  });
+
+const registerItemsCount = (variant: ResetVariant): void =>
+  makeTest({
+    config: mainConfig,
+    title: 'should keep itemsCount connected to the active buffer',
+    meta: variant.isNew ? 'new datasource' : 'partial datasource',
+    it: misc => async () => {
+      const publicAdapter = misc.adapter;
+      const definition = adapterProps.find(
+        prop => prop.name === Adapter.itemsCount
+      );
+
+      expect(publicAdapter.itemsCount).toBe(definition?.value);
+      await misc.relaxNext();
+      expect(publicAdapter.itemsCount).toBe(
+        misc.scroller.buffer.getVisibleItemsCount()
+      );
+
+      await reset(misc, variant);
+
+      expectAdaptersLinked(misc, publicAdapter);
+      expect(publicAdapter.itemsCount).toBe(
+        misc.scroller.buffer.getVisibleItemsCount()
+      );
+    }
+  });
+
+const registerIsLoading = (variant: ResetVariant): void =>
+  makeTest({
+    config: mainConfig,
+    title: 'should preserve isLoading$ subscriptions',
+    meta: variant.isNew ? 'new datasource' : 'partial datasource',
+    it: misc => async () => {
+      const targets = adapters(misc);
+      const emissions = targets.map<boolean[]>(() => []);
+      const offs = targets.map((adapter, index) =>
+        adapter.isLoading$.on(value => {
+          emissions[index].push(value);
+          expect(value).toBe(adapter.isLoading);
+        })
+      );
+
+      await misc.relaxNext();
+      await reset(misc, variant);
+      offs.forEach(off => off());
+
+      // isLoading toggles once for the initial load and once for the reset load
+      emissions.forEach(values =>
+        expect(values).toEqual([true, false, true, false])
+      );
+    }
+  });
+
+const registerFirstVisible = (variant: ResetVariant): void =>
+  makeTest({
+    config: mainConfig,
+    title: 'should preserve firstVisible$ subscriptions',
+    meta: variant.isNew ? 'new datasource' : 'partial datasource',
+    it: misc => async () => {
+      const targets = adapters(misc);
+      const emissions = targets.map<Array<number | undefined>>(() => []);
+      const offs = targets.map((adapter, index) =>
+        adapter.firstVisible$.on(value => {
+          emissions[index].push(value.$index);
+          expect(value.$index).toBe(adapter.firstVisible.$index);
+        })
+      );
+
+      await misc.relaxNext();
+      await reset(misc, variant);
+      offs.forEach(off => off());
+
+      // undefined before init, 1 after init (startIndex 1), 100 after reset
+      emissions.forEach(values => expect(values).toEqual([undefined, 1, 100]));
+    }
+  });
+
+const registerBof = (variant: ResetVariant): void =>
+  makeTest({
+    config: bofConfig,
+    title: 'should preserve bof$ subscriptions',
+    meta: variant.isNew ? 'new datasource' : 'partial datasource',
+    it: misc => async () => {
+      const targets = adapters(misc);
+      const emissions = targets.map<boolean[]>(() => []);
+      const offs = targets.map((adapter, index) =>
+        adapter.bof$.on(value => {
+          emissions[index].push(value);
+          expect(value).toBe(adapter.bof);
+        })
+      );
+
+      await misc.relaxNext();
+      await misc.scrollMaxRelax();
+      await reset(misc, variant);
+      offs.forEach(off => off());
+
+      // bof at start, false after scrollMax, true again after reset to startIndex 1
+      emissions.forEach(values => expect(values).toEqual([true, false, true]));
+    }
+  });
+
+describe('Adapter Reset Persistence Spec', () => {
+  variants.forEach(variant => {
+    registerPermanentProp(Adapter.id, variant);
+    registerPermanentProp(Adapter.version, variant);
+    registerItemsCount(variant);
+    registerIsLoading(variant);
+    registerFirstVisible(variant);
+  });
+
+  bofVariants.forEach(registerBof);
+
+  makeTest({
+    config: workflowConfig,
+    title: 'should keep workflow calls working after reset',
+    it: misc => async () => {
+      await misc.relaxNext();
+      expect(misc.workflow.cyclesDone).toBe(1);
+
+      const thirdCycle = misc.waitForCycles(3);
+      const resetResult = misc.adapter.reset();
+      const reloadResult = misc.adapter.reload();
+      await thirdCycle;
+      await Promise.all([resetResult, reloadResult]);
+      expect(misc.workflow.cyclesDone).toBe(3);
+
+      await misc.adapter.reload();
+      expect(misc.workflow.cyclesDone).toBe(4);
+    }
+  });
+});
diff --git a/tests/e2e/specs/adapter.reset.spec.ts b/tests/e2e/specs/adapter.reset.spec.ts
new file mode 100644
index 00000000..d3abc675
--- /dev/null
+++ b/tests/e2e/specs/adapter.reset.spec.ts
@@ -0,0 +1,219 @@
+import {
+  Direction,
+  getDatasource,
+  makeTest,
+  Misc,
+  starGet,
+  IDatasourceOptional,
+  TestConfig
+} from '../scaffolding';
+
+interface ResetSnapshot {
+  instanceIndex: number;
+  firstVisible: number;
+  firstVisibleUid: number;
+  lastVisible: number;
+  firstVisibleText: string;
+  interruptions: number;
+}
+
+interface ResetScenario {
+  config: TestConfig;
+  options?: IDatasourceOptional;
+  scrolls?: number;
+  direction?: Direction;
+  interruption?: boolean;
+  starData?: boolean;
+}
+
+const baseConfigs: TestConfig[] = [
+  {
+    datasource: () => getDatasource({ mode: 'promise' }),
+    datasourceSettings: { startIndex: 1, bufferSize: 5, padding: 0.25 },
+    templateSettings: { viewportHeight: 100 }
+  },
+  {
+    datasource: () => getDatasource({ mode: 'promise' }),
+    datasourceSettings: { startIndex: -123, bufferSize: 6, padding: 0.62 },
+    templateSettings: { viewportHeight: 160 }
+  },
+  {
+    datasource: () => getDatasource({ mode: 'promise' }),
+    datasourceSettings: {
+      startIndex: -33,
+      bufferSize: 5,
+      padding: 0.3,
+      horizontal: true
+    },
+    templateSettings: { viewportWidth: 300, itemWidth: 100, horizontal: true }
+  }
+];
+
+const settingsScenarios: ResetScenario[] = [baseConfigs[0], baseConfigs[2]].map(
+  config => ({
+    config,
+    options: {
+      settings: {
+        ...config.datasourceSettings,
+        startIndex: 999
+      } as IDatasourceOptional['settings']
+    }
+  })
+);
+
+const scrollScenarios: ResetScenario[] = settingsScenarios.flatMap(scenario =>
+  [Direction.forward, Direction.backward].map(direction => ({
+    ...scenario,
+    scrolls: 4,
+    direction
+  }))
+);
+
+const newGetScenarios: ResetScenario[] = [baseConfigs[0], baseConfigs[2]].map(
+  config => ({ config, options: { get: starGet }, starData: true })
+);
+
+const invalidOptions: unknown[] = [
+  { settings: 'bad' },
+  { devSettings: 'bad' },
+  { get: 'bad' },
+  { get: (_index: number) => 'bad' },
+  {
+    get: (_index: number, _count: number) => null,
+    settings: {},
+    devSettings: 'bad'
+  }
+];
+
+const takeSnapshot = (misc: Misc): ResetSnapshot => ({
+  instanceIndex: misc.scroller.settings.instanceIndex,
+  firstVisible: misc.adapter.firstVisible.$index,
+  firstVisibleUid: misc.adapter.firstVisible.uid,
+  lastVisible: misc.adapter.lastVisible.$index,
+  firstVisibleText: misc.adapter.firstVisible.data.text,
+  interruptions: misc.workflow.interruptionCount
+});
+
+const expectReset = (
+  misc: Misc,
+  before: ResetSnapshot,
+  scenario: ResetScenario
+): void => {
+  const configuredStart = scenario.options?.settings?.startIndex;
+  const firstVisible =
+    configuredStart === undefined ? before.firstVisible : configuredStart;
+  const after = takeSnapshot(misc);
+
+  expect(after.instanceIndex).toBe(before.instanceIndex + 1);
+  expect(after.firstVisible).toBe(firstVisible);
+  expect(after.firstVisibleUid).not.toBe(before.firstVisibleUid);
+  expect(after.lastVisible).toBe(
+    firstVisible + before.lastVisible - before.firstVisible
+  );
+  expect(after.firstVisibleText).toBe(
+    `item #${firstVisible}${scenario.starData ? ' *' : ''}`
+  );
+  expect(after.interruptions).toBe(
+    before.interruptions + Number(!!scenario.interruption)
+  );
+  misc.expect.uniqueItems();
+};
+
+const reset = (misc: Misc, options?: IDatasourceOptional) =>
+  options ? misc.adapter.reset(options) : misc.adapter.reset();
+
+const registerReset = (scenario: ResetScenario, title: string): void =>
+  makeTest({
+    config: scenario.config,
+    title,
+    meta:
+      scenario.options?.settings?.startIndex !== undefined
+        ? `start = ${scenario.options.settings.startIndex}`
+        : scenario.starData
+          ? 'new get'
+          : scenario.interruption
+            ? 'interrupted'
+            : 'same datasource',
+    it: misc => async () => {
+      misc.trackVisibleItems();
+      await misc.relaxNext();
+      for (let step = 0; step < (scenario.scrolls ?? 0); step++) {
+        await (scenario.direction === Direction.backward
+          ? misc.scrollMinRelax()
+          : misc.scrollMaxRelax());
+      }
+      const before = takeSnapshot(misc);
+
+      if (scenario.interruption) {
+        // Start a reload, then fire reset on the next macrotask so it lands
+        // while the reload is still pending and interrupts it. Both settle
+        // within the two cycles we wait for.
+        const finished = misc.waitForCycles(misc.workflow.cyclesDone + 2);
+        const reloadResult = misc.adapter.reload();
+        let resetResult: ReturnType<typeof misc.adapter.reset>;
+        setTimeout(() => (resetResult = reset(misc, scenario.options)));
+        await finished;
+        await Promise.all([reloadResult, resetResult!]);
+      } else {
+        await reset(misc, scenario.options);
+      }
+
+      expectReset(misc, before, scenario);
+    }
+  });
+
+describe('Adapter Reset Spec', () => {
+  describe('Without parameters', () =>
+    baseConfigs.forEach(config =>
+      registerReset({ config }, 'should reset at the current position')
+    ));
+
+  describe('Invalid parameters', () =>
+    invalidOptions.forEach((options, index) =>
+      makeTest({
+        config: baseConfigs[0],
+        title: 'should reject invalid reset parameters',
+        meta: `case ${index + 1}`,
+        it: misc => async () => {
+          misc.trackVisibleItems();
+          await misc.relaxNext();
+          const before = takeSnapshot(misc);
+
+          const result = await misc.adapter.reset(
+            options as IDatasourceOptional
+          );
+
+          expect(result.success).toBe(false);
+          expect(result.immediate).toBe(true);
+          expect(misc.workflow.cyclesDone).toBe(1);
+          expect(takeSnapshot(misc)).toEqual(before);
+          expect(
+            misc.workflow.errors.some(error => error.process.endsWith('reset'))
+          ).toBe(true);
+        }
+      })
+    ));
+
+  describe('Interruption', () =>
+    [baseConfigs[0], baseConfigs[2]].forEach(config =>
+      registerReset(
+        { config, interruption: true },
+        'should interrupt a pending reload'
+      )
+    ));
+
+  describe('New settings', () =>
+    settingsScenarios.forEach(scenario =>
+      registerReset(scenario, 'should reset at the new position')
+    ));
+
+  describe('New settings after scrolling', () =>
+    scrollScenarios.forEach(scenario =>
+      registerReset(scenario, 'should reset after scrolling')
+    ));
+
+  describe('New get', () =>
+    newGetScenarios.forEach(scenario =>
+      registerReset(scenario, 'should reset with new data')
+    ));
+});
diff --git a/tests/e2e/specs/adapter.update.spec.ts b/tests/e2e/specs/adapter.update.spec.ts
new file mode 100644
index 00000000..2714582a
--- /dev/null
+++ b/tests/e2e/specs/adapter.update.spec.ts
@@ -0,0 +1,408 @@
+import {
+  BufferUpdater,
+  makeTest,
+  Misc,
+  MutableDatasource,
+  TestConfig,
+  TestItem
+} from '../scaffolding';
+
+interface ExpectedRow {
+  index: number;
+  text: string;
+}
+
+interface IdentityExpectation {
+  stable: string[];
+  fresh: string[];
+}
+
+interface UpdateOutcome {
+  rows: ExpectedRow[];
+  identity: IdentityExpectation;
+  firstVisible: number;
+}
+
+interface UpdateScenario {
+  title: string;
+  startIndex?: number;
+  predicate: BufferUpdater<TestItem>;
+  left: UpdateOutcome;
+  right: UpdateOutcome;
+  /** Settled Average-strategy value captured from the implementation. */
+  expectedDefaultSize?: number;
+}
+
+const min = -29;
+const max = 30;
+const itemSize = 20;
+const viewportSize = 100;
+const itemsPerPage = viewportSize / itemSize;
+
+const make = (text: string, size: number): TestItem => ({ id: 0, text, size });
+const row = (index: number, text: string): ExpectedRow => ({ index, text });
+const outcome = (
+  rows: ExpectedRow[],
+  stable: string[],
+  fresh: string[],
+  firstVisible: number
+): UpdateOutcome => ({
+  rows,
+  identity: { stable, fresh },
+  firstVisible
+});
+
+const scenarios: UpdateScenario[] = [
+  {
+    title: 'no-op',
+    predicate: _item => true,
+    left: outcome(
+      [row(0, 'item #0'), row(1, 'item #1'), row(2, 'item #2')],
+      ['item #0', 'item #1', 'item #2'],
+      [],
+      1
+    ),
+    right: outcome(
+      [row(0, 'item #0'), row(1, 'item #1'), row(2, 'item #2')],
+      ['item #0', 'item #1', 'item #2'],
+      [],
+      1
+    )
+  },
+  {
+    title: 'replace one-to-one',
+    predicate: ({ $index }) => ($index === 1 ? [make('xxx', 125)] : true),
+    left: outcome(
+      [row(0, 'item #0'), row(1, 'xxx'), row(2, 'item #2')],
+      ['item #0', 'item #2'],
+      ['xxx'],
+      1
+    ),
+    right: outcome(
+      [row(0, 'item #0'), row(1, 'xxx'), row(2, 'item #2')],
+      ['item #0', 'item #2'],
+      ['xxx'],
+      1
+    ),
+    expectedDefaultSize: 28
+  },
+  {
+    title: 'replace one-to-three',
+    predicate: ({ $index }) =>
+      $index === 3 ? [make('xxx', 1), make('yyy', 1), make('zzz', 125)] : true,
+    left: outcome(
+      [
+        row(2, 'item #2'),
+        row(3, 'xxx'),
+        row(4, 'yyy'),
+        row(5, 'zzz'),
+        row(6, 'item #4')
+      ],
+      ['item #2', 'item #4'],
+      ['xxx', 'yyy', 'zzz'],
+      1
+    ),
+    right: outcome(
+      [
+        row(0, 'item #2'),
+        row(1, 'xxx'),
+        row(2, 'yyy'),
+        row(3, 'zzz'),
+        row(4, 'item #4')
+      ],
+      ['item #2', 'item #4'],
+      ['xxx', 'yyy', 'zzz'],
+      -1
+    ),
+    expectedDefaultSize: 24
+  },
+  {
+    title: 'insert two around one original item',
+    startIndex: 10,
+    predicate: ({ $index, data }) =>
+      $index === 10 ? [make('xxx', itemSize), data, make('yyy', 125)] : true,
+    left: outcome(
+      [
+        row(9, 'item #9'),
+        row(10, 'xxx'),
+        row(11, 'item #10'),
+        row(12, 'yyy'),
+        row(13, 'item #11')
+      ],
+      ['item #9', 'item #10', 'item #11'],
+      ['xxx', 'yyy'],
+      11
+    ),
+    right: outcome(
+      [
+        row(7, 'item #9'),
+        row(8, 'xxx'),
+        row(9, 'item #10'),
+        row(10, 'yyy'),
+        row(11, 'item #11')
+      ],
+      ['item #9', 'item #10', 'item #11'],
+      ['xxx', 'yyy'],
+      9
+    ),
+    expectedDefaultSize: 27
+  },
+  {
+    title: 'prepend',
+    startIndex: min,
+    predicate: ({ $index, data }) =>
+      $index === min ? [make('xxx', 125), data] : true,
+    left: outcome(
+      [row(min, 'xxx'), row(min + 1, `item #${min}`)],
+      [`item #${min}`],
+      ['xxx'],
+      min + 1
+    ),
+    right: outcome(
+      [row(min - 1, 'xxx'), row(min, `item #${min}`)],
+      [`item #${min}`],
+      ['xxx'],
+      min
+    ),
+    expectedDefaultSize: 32
+  },
+  {
+    title: 'append',
+    startIndex: max,
+    predicate: ({ $index, data }) =>
+      $index === max ? [data, make('xxx', 125)] : true,
+    left: outcome(
+      [row(max, `item #${max}`), row(max + 1, 'xxx')],
+      [`item #${max}`],
+      ['xxx'],
+      max - itemsPerPage + 1
+    ),
+    right: outcome(
+      [row(max - 1, `item #${max}`), row(max, 'xxx')],
+      [`item #${max}`],
+      ['xxx'],
+      max - itemsPerPage
+    ),
+    expectedDefaultSize: 32
+  },
+  {
+    title: 'remove two',
+    predicate: ({ $index }) => !($index === 1 || $index === 3),
+    left: outcome(
+      [row(0, 'item #0'), row(1, 'item #2'), row(2, 'item #4')],
+      ['item #0', 'item #2', 'item #4'],
+      [],
+      1
+    ),
+    right: outcome(
+      [row(2, 'item #0'), row(3, 'item #2'), row(4, 'item #4')],
+      ['item #0', 'item #2', 'item #4'],
+      [],
+      3
+    )
+  },
+  {
+    title: 'remove left edge',
+    startIndex: min,
+    predicate: ({ $index }) => $index !== min,
+    left: outcome(
+      [row(min, `item #${min + 1}`), row(min + 1, `item #${min + 2}`)],
+      [`item #${min + 1}`, `item #${min + 2}`],
+      [],
+      min
+    ),
+    right: outcome(
+      [row(min + 1, `item #${min + 1}`), row(min + 2, `item #${min + 2}`)],
+      [`item #${min + 1}`, `item #${min + 2}`],
+      [],
+      min + 1
+    )
+  },
+  {
+    title: 'remove right edge',
+    startIndex: max,
+    predicate: ({ $index }) => $index !== max,
+    left: outcome(
+      [row(max - 2, `item #${max - 2}`), row(max - 1, `item #${max - 1}`)],
+      [`item #${max - 2}`, `item #${max - 1}`],
+      [],
+      max - itemsPerPage
+    ),
+    right: outcome(
+      [row(max - 1, `item #${max - 2}`), row(max, `item #${max - 1}`)],
+      [`item #${max - 2}`, `item #${max - 1}`],
+      [],
+      max - itemsPerPage + 1
+    )
+  },
+  {
+    title: 'perform complex update',
+    predicate: ({ $index, data }) => {
+      switch ($index) {
+        case 1:
+          return [make('a', 2), data];
+        case 2:
+          return [];
+        case 3:
+          return [make('b', 2), make('c', 2)];
+        case 4:
+          return [];
+        case 5:
+          return [data, make('d', 2)];
+        default:
+          return true;
+      }
+    },
+    left: outcome(
+      [
+        row(1, 'a'),
+        row(2, 'item #1'),
+        row(3, 'b'),
+        row(4, 'c'),
+        row(5, 'item #5'),
+        row(6, 'd')
+      ],
+      ['item #1', 'item #5'],
+      ['a', 'b', 'c', 'd'],
+      2
+    ),
+    right: outcome(
+      [
+        row(0, 'a'),
+        row(1, 'item #1'),
+        row(2, 'b'),
+        row(3, 'c'),
+        row(4, 'item #5'),
+        row(5, 'd')
+      ],
+      ['item #1', 'item #5'],
+      ['a', 'b', 'c', 'd'],
+      1
+    ),
+    expectedDefaultSize: 16
+  }
+];
+
+const createSource = (): MutableDatasource => {
+  const source = new MutableDatasource(min, max);
+  source.setSizes(() => itemSize);
+  return source;
+};
+
+const createConfig = (scenario: UpdateScenario): TestConfig => ({
+  datasource: createSource,
+  datasourceSettings: {
+    startIndex: scenario.startIndex ?? 1,
+    minIndex: min,
+    maxIndex: max,
+    itemSize
+  },
+  templateSettings: {
+    viewportHeight: viewportSize,
+    itemHeight: itemSize,
+    dynamicSize: 'size'
+  },
+  timeout: 4000
+});
+
+const expectRows = (misc: Misc, rows: ExpectedRow[]): void => {
+  const items = misc.scroller.buffer.items;
+  const start = items.findIndex(item => item.$index === rows[0].index);
+  expect(start).toBeGreaterThanOrEqual(0);
+
+  rows.forEach((expected, offset) => {
+    const item = items[start + offset];
+    expect(item.$index).toBe(expected.index);
+    expect(item.data.text).toBe(expected.text);
+    expect(item.invisible).toBe(false);
+    expect(misc.getElementText(expected.index)).toBe(
+      `${expected.index}: ${expected.text}`
+    );
+  });
+};
+
+const expectIdentity = (
+  misc: Misc,
+  before: Misc['scroller']['buffer']['items'],
+  expected: IdentityExpectation
+): void => {
+  const after = misc.scroller.buffer.items;
+  misc.expect.uniqueItems(after);
+
+  expected.stable.forEach(text => {
+    const oldItem = before.find(item => item.data.text === text);
+    const newItem = after.find(item => item.data.text === text);
+    expect(oldItem).toBeDefined();
+    expect(newItem?.uid).toBe(oldItem?.uid);
+  });
+  expected.fresh.forEach(text => {
+    expect(before.some(item => item.data.text === text)).toBe(false);
+    expect(after.some(item => item.data.text === text)).toBe(true);
+  });
+};
+
+const registerScenario = (scenario: UpdateScenario, fixRight: boolean): void =>
+  makeTest({
+    config: createConfig(scenario),
+    title: `should ${scenario.title}`,
+    meta: `fixRight = ${fixRight}`,
+    it: misc => async () => {
+      await misc.relaxNext();
+      const expected = fixRight ? scenario.right : scenario.left;
+      const beforeItems = [...misc.scroller.buffer.items];
+
+      misc.source<MutableDatasource>().update(scenario.predicate, fixRight);
+      await misc.adapter.update({ predicate: scenario.predicate, fixRight });
+
+      expect(misc.adapter.firstVisible.$index).toBe(expected.firstVisible);
+      expectRows(misc, expected.rows);
+      expectIdentity(misc, beforeItems, expected.identity);
+      if (scenario.expectedDefaultSize !== undefined) {
+        expect(misc.scroller.buffer.defaultSize).toBe(
+          scenario.expectedDefaultSize
+        );
+      }
+
+      await misc.scrollMinMaxRelax();
+      await misc.scrollToIndexRelax(expected.rows[0].index);
+      expectRows(misc, expected.rows);
+    }
+  });
+
+const registerCleanup = (fixRight: boolean): void =>
+  makeTest({
+    config: createConfig(scenarios[0]),
+    title: 'should refill after removing the entire buffer',
+    meta: `fixRight = ${fixRight}`,
+    it: misc => async () => {
+      await misc.relaxNext();
+      const { firstIndex, lastIndex } = misc.scroller.buffer;
+      const removed = lastIndex - firstIndex + 1;
+      const predicate: BufferUpdater<TestItem> = ({ $index }) =>
+        !($index >= firstIndex && $index <= lastIndex);
+
+      misc.source<MutableDatasource>().update(predicate, fixRight);
+      await misc.adapter.update({ predicate, fixRight });
+
+      expect(misc.adapter.firstVisible.$index).toBe(
+        fixRight ? lastIndex + 1 : firstIndex
+      );
+      await misc.scrollMinRelax();
+      expect(misc.scroller.buffer.firstIndex).toBe(
+        min + (fixRight ? removed : 0)
+      );
+      await misc.scrollMaxRelax();
+      expect(misc.scroller.buffer.lastIndex).toBe(
+        max - (fixRight ? 0 : removed)
+      );
+    }
+  });
+
+describe('Adapter Update Spec', () => {
+  describe('Updates', () =>
+    [false, true].forEach(fixRight =>
+      scenarios.forEach(scenario => registerScenario(scenario, fixRight))
+    ));
+
+  describe('After cleanup', () => [false, true].forEach(registerCleanup));
+});
diff --git a/tests/e2e/specs/bug.spec.ts b/tests/e2e/specs/bug.spec.ts
new file mode 100644
index 00000000..6fec2dfe
--- /dev/null
+++ b/tests/e2e/specs/bug.spec.ts
@@ -0,0 +1,376 @@
+import {
+  getDatasource,
+  makeDatasource,
+  makeTest,
+  TestHost,
+  DatasourceProcessor,
+  ItemAdapter,
+  TestConfig,
+  TestItem
+} from '../scaffolding';
+
+const Datasource = makeDatasource();
+const removedIndexes = [1, 2, 3, 4, 5];
+const replacementMin = 2;
+const replacementMax = 5;
+const clippedIndexes: number[] = [];
+
+const shiftDatasourceAfterReplacement: DatasourceProcessor = items =>
+  items.forEach(({ data }) => {
+    if (data.id < replacementMin) {
+      return;
+    }
+    data.id += replacementMax - replacementMin + 1;
+    data.text = `item #${data.id}`;
+  });
+
+const removeDatasourceBeginning: DatasourceProcessor = items => {
+  for (let index = items.length - 1; index >= 0; index--) {
+    if (removedIndexes.includes(items[index].data.id)) {
+      items.splice(index, 1);
+    }
+  }
+};
+
+const emptyScrollableConfig: TestConfig = {
+  datasource: () => getDatasource({ min: 1, max: 0 }),
+  templateSettings: { viewportPadding: 200 }
+};
+
+const bothEdgesConfig: TestConfig = {
+  datasource: () => getDatasource({ min: 1, max: 100 }),
+  datasourceSettings: { padding: 5 },
+  templateSettings: { viewportHeight: 300, itemHeight: 15 }
+};
+
+const reloadConfig: TestConfig = {
+  datasource: () => getDatasource({ delay: 150 }),
+  datasourceSettings: { bufferSize: 15 },
+  timeout: 4000
+};
+
+const inverseConfig: TestConfig = {
+  datasource: () => getDatasource({ min: 1, max: 10 }),
+  datasourceSettings: {
+    startIndex: -1,
+    bufferSize: 7,
+    itemSize: 20,
+    inverse: true
+  },
+  templateSettings: { viewportHeight: 300, dynamicSize: 'size' }
+};
+
+const replacementConfig: TestConfig = {
+  datasource: () => getDatasource({ min: -99, max: 100 }),
+  datasourceSettings: { startIndex: replacementMin - 1 }
+};
+
+const clipConfig: TestConfig = {
+  datasource: () => getDatasource(),
+  datasourceSettings: { bufferSize: 50 }
+};
+
+const beforeClipConfig: TestConfig = {
+  datasource: () => getDatasource(),
+  datasourceSettings: {
+    onBeforeClip: items =>
+      items.forEach(({ $index }) => clippedIndexes.push($index))
+  }
+};
+
+const infiniteConfig: TestConfig = {
+  datasource: () => getDatasource({ delay: 25 }),
+  datasourceSettings: { bufferSize: 50, infinite: true },
+  timeout: 4000
+};
+
+const removeConfig: TestConfig = {
+  datasource: () => getDatasource({ min: 1, max: 100 }),
+  datasourceSettings: {
+    startIndex: 1,
+    minIndex: 1,
+    maxIndex: 100,
+    bufferSize: 5
+  }
+};
+
+const largePaddingConfig: TestConfig = {
+  datasource: () => getDatasource(),
+  datasourceSettings: {
+    startIndex: 1,
+    minIndex: 1,
+    maxIndex: 123456,
+    bufferSize: 5
+  }
+};
+
+const negativeCutConfig: TestConfig = {
+  datasource: () => getDatasource({ min: -10, max: 100 }),
+  datasourceSettings: { startIndex: 1, bufferSize: 5 },
+  templateSettings: { viewportHeight: 250, itemHeight: 22 }
+};
+
+describe('Bug Spec', () => {
+  makeTest({
+    config: emptyScrollableConfig,
+    title: 'should stop empty datasource cycles on the first inner loop',
+    it: misc => async () => {
+      await misc.relaxNext();
+      await misc.scrollMaxRelax();
+      await misc.scrollMinRelax();
+      await misc.scrollMaxRelax();
+
+      expect(misc.workflow.cyclesDone).toBe(4);
+      expect(misc.innerLoopCount).toBe(4);
+      expect(misc.scroller.buffer.size).toBe(0);
+    }
+  });
+
+  makeTest({
+    config: bothEdgesConfig,
+    title: 'should update firstVisible and lastVisible at both edges',
+    it: misc => async () => {
+      let firstUpdates = 0;
+      let lastUpdates = 0;
+      let checkedFirst = 0;
+      let checkedLast = 0;
+      const offFirst = misc.adapter.firstVisible$.on(() => firstUpdates++);
+      const offLast = misc.adapter.lastVisible$.on(() => lastUpdates++);
+      const check = () => {
+        expect(misc.adapter.bof).toBe(true);
+        expect(misc.adapter.eof).toBe(true);
+        expect(firstUpdates).toBeGreaterThan(checkedFirst);
+        expect(lastUpdates).toBeGreaterThan(checkedLast);
+        checkedFirst = firstUpdates;
+        checkedLast = lastUpdates;
+        misc.expect.visibleWithinBuffer();
+      };
+
+      try {
+        await misc.relaxNext();
+        check();
+        await misc.scrollMaxRelax();
+        check();
+        await misc.scrollMinRelax();
+        check();
+      } finally {
+        offFirst();
+        offLast();
+      }
+    }
+  });
+
+  makeTest({
+    config: reloadConfig,
+    title: 'should recover from repeated reload interruptions',
+    it: misc => async () => {
+      if (!misc.adapter.init) {
+        await misc.waitForAdapterInit();
+      }
+
+      const reloads: Array<ReturnType<typeof misc.adapter.reload>> = [];
+      const reloadTwice = () => {
+        reloads.push(misc.adapter.reload(), misc.adapter.reload());
+      };
+
+      reloadTwice();
+      await misc.delay(25);
+      reloadTwice();
+      await misc.delay(25);
+      reloadTwice();
+
+      const results = await Promise.all(reloads);
+      await misc.adapter.relax();
+
+      expect(results).toHaveLength(6);
+      expect(results.every(result => result.success)).toBe(true);
+      expect(misc.workflow.isInitialized).toBe(true);
+      misc.expect.domMatchesBuffer();
+
+      const cyclesDone = misc.workflow.cyclesDone;
+      await misc.adapter.reload();
+      expect(misc.workflow.cyclesDone).toBeGreaterThan(cyclesDone);
+    }
+  });
+
+  makeTest({
+    config: inverseConfig,
+    title: 'should not extend forward padding for an oversized inverse item',
+    before: misc =>
+      misc.setItemProcessor(({ $index, data }) => {
+        data.size = $index === 4 ? 120 : 20;
+      }),
+    it: misc => async () => {
+      await misc.relaxNext();
+
+      expect(misc.padding.backward.getSize()).toBe(0);
+      expect(misc.padding.forward.getSize()).toBe(0);
+      misc.expect.domIndexesMatchBuffer();
+    }
+  });
+
+  test('should deliver firstVisible to an early subscriber', async () => {
+    const source = getDatasource({ min: 1, max: 100 });
+    const datasource = new Datasource<TestItem>({
+      get: source.get.bind(source),
+      settings: { startIndex: 1 }
+    });
+    let firstVisible: ItemAdapter<TestItem> | undefined;
+    const off = datasource.adapter.firstVisible$.on(value => {
+      firstVisible = value;
+    });
+    const host = new TestHost({ datasource: () => datasource });
+
+    try {
+      await host.relaxNext();
+      expect(firstVisible).toBe(host.adapter.firstVisible);
+      expect(firstVisible?.$index).toBe(1);
+    } finally {
+      off();
+      host.dispose();
+    }
+  });
+
+  makeTest({
+    config: replacementConfig,
+    title: 'should keep firstVisible while replacing via remove and insert',
+    it: misc => async () => {
+      await misc.relaxNext();
+      expect(misc.adapter.firstVisible.$index).toBe(replacementMin - 1);
+
+      misc.setDatasourceProcessor(shiftDatasourceAfterReplacement);
+      await misc.adapter.remove({
+        predicate: ({ $index }) =>
+          $index >= replacementMin && $index <= replacementMax
+      });
+      await misc.adapter.insert({
+        items: [{ id: replacementMax + 1, text: `item #${replacementMax} *` }],
+        after: ({ $index }) => $index === replacementMin - 1
+      });
+
+      expect(misc.adapter.firstVisible.$index).toBe(replacementMin - 1);
+      misc.scroller.buffer.items.forEach(item => {
+        const expected =
+          item.$index === replacementMin
+            ? `${replacementMax} *`
+            : String(
+                item.$index > replacementMin
+                  ? item.$index + replacementMax - replacementMin
+                  : item.$index
+              );
+        expect(item.data.text).toBe(`item #${expected}`);
+      });
+      misc.expect.domIndexesMatchBuffer();
+    }
+  });
+
+  makeTest({
+    config: clipConfig,
+    title: 'should clip only once',
+    it: misc => async () => {
+      const { clip } = misc.scroller.state;
+      await misc.relaxNext();
+      expect(clip.callCount).toBe(0);
+
+      await misc.adapter.clip();
+      expect(clip.callCount).toBe(1);
+
+      await misc.adapter.clip();
+      expect(clip.callCount).toBe(1);
+    }
+  });
+
+  makeTest({
+    config: beforeClipConfig,
+    title: 'should pass exactly removed items to onBeforeClip',
+    before: () => {
+      clippedIndexes.length = 0;
+    },
+    it: misc => async () => {
+      await misc.relaxNext();
+      const before = misc.scroller.buffer.items.map(item => item.$index);
+
+      await misc.scrollMaxRelax();
+
+      const after = new Set(
+        misc.scroller.buffer.items.map(item => item.$index)
+      );
+      const removed = before.filter(index => !after.has(index)).sort();
+
+      expect(removed.length).toBeGreaterThan(0);
+      expect([...clippedIndexes].sort()).toEqual(removed);
+    }
+  });
+
+  makeTest({
+    config: infiniteConfig,
+    title: 'should finish a scroll cycle in infinite mode',
+    it: misc => async () => {
+      await misc.relaxNext();
+      const cyclesDone = misc.workflow.cyclesDone;
+
+      await misc.scrollMinRelax();
+
+      expect(misc.workflow.cyclesDone).toBe(cyclesDone + 1);
+      expect(misc.scroller.state.cycle.busy.get()).toBe(false);
+      misc.expect.domMatchesBuffer();
+    }
+  });
+
+  makeTest({
+    config: removeConfig,
+    title: 'should shift startIndex after removal with increase',
+    it: misc => async () => {
+      await misc.relaxNext();
+      const { buffer } = misc.scroller;
+      const startIndex = buffer.startIndex;
+      const stableBufferSize = buffer.size;
+
+      await misc.adapter.remove({
+        predicate: ({ $index }) => removedIndexes.includes($index),
+        increase: true
+      });
+      misc.setDatasourceProcessor(removeDatasourceBeginning);
+
+      expect(buffer.startIndex).toBe(startIndex + removedIndexes.length);
+      await misc.scrollMaxRelax();
+      await misc.scrollMinRelax();
+
+      misc.expect.domMatchesBuffer();
+      expect(buffer.size).toBeLessThanOrEqual(stableBufferSize);
+    }
+  });
+
+  makeTest({
+    config: largePaddingConfig,
+    title: 'should not jump when padding is larger than one million pixels',
+    it: misc => async () => {
+      await misc.relaxNext();
+      await misc.scrollMaxRelax();
+
+      expect(misc.adapter.eof).toBe(true);
+      expect(misc.getScrollPosition()).toBe(
+        misc.getScrollableSize() - misc.getViewportSize()
+      );
+      misc.expect.consistent();
+    }
+  });
+
+  makeTest({
+    config: negativeCutConfig,
+    title: 'should not leave a gap after cutting negative indexes',
+    it: misc => async () => {
+      await misc.relaxNext();
+      await misc.scrollMaxRelax();
+      await misc.scrollMinRelax();
+
+      expect(misc.adapter.bof).toBe(true);
+      expect(misc.adapter.bufferInfo.minIndex).toBe(-10);
+      expect(misc.adapter.bufferInfo.firstIndex).toBe(-10);
+      expect(misc.adapter.bufferInfo.absMinIndex).toBe(-10);
+      expect(misc.adapter.firstVisible.$index).toBe(-5);
+      expect(misc.checkElementContentByIndex(-5)).toBe(true);
+      misc.expect.domMatchesBuffer();
+    }
+  });
+});
diff --git a/tests/e2e/specs/common.spec.ts b/tests/e2e/specs/common.spec.ts
new file mode 100644
index 00000000..823db9f6
--- /dev/null
+++ b/tests/e2e/specs/common.spec.ts
@@ -0,0 +1,208 @@
+import {
+  getDatasource,
+  makeTest,
+  ParsedSettings,
+  TestHost,
+  Settings,
+  TestConfig
+} from '../scaffolding';
+
+const initDelay = 50;
+const baseConfig: TestConfig = {
+  datasource: () => getDatasource({ min: 1, max: 100 }),
+  datasourceSettings: {
+    startIndex: 1,
+    minIndex: 1,
+    maxIndex: 100,
+    itemSize: 20,
+    bufferSize: 5,
+    padding: 0.5
+  },
+  templateSettings: { viewportHeight: 200, itemHeight: 20 }
+};
+
+const parseSettings = (settings?: unknown): ParsedSettings =>
+  new ParsedSettings(settings as Settings | undefined, undefined, 1);
+
+const takeCoreSettings = (settings: ParsedSettings) => ({
+  startIndex: settings.startIndex,
+  bufferSize: settings.bufferSize,
+  padding: settings.padding,
+  itemSize: settings.itemSize,
+  infinite: settings.infinite,
+  horizontal: settings.horizontal
+});
+
+describe('Common Spec', () => {
+  describe('Settings', () => {
+    test('uses defaults for missing or malformed input', () => {
+      [undefined, null, 'invalid', 42].forEach(input =>
+        expect(takeCoreSettings(parseSettings(input))).toEqual({
+          startIndex: 1,
+          bufferSize: 5,
+          padding: 0.5,
+          itemSize: NaN,
+          infinite: false,
+          horizontal: false
+        })
+      );
+    });
+
+    test('applies valid overrides', () => {
+      expect(
+        takeCoreSettings(
+          parseSettings({ startIndex: 99, bufferSize: 11, infinite: true })
+        )
+      ).toEqual({
+        startIndex: 99,
+        bufferSize: 11,
+        padding: 0.5,
+        itemSize: NaN,
+        infinite: true,
+        horizontal: false
+      });
+    });
+
+    test('normalizes invalid and below-limit values', () => {
+      const cases: Array<{
+        key: keyof Settings;
+        input: unknown;
+        expected: unknown;
+      }> = [
+        { key: 'startIndex', input: false, expected: 1 },
+        { key: 'bufferSize', input: { invalid: true }, expected: 5 },
+        { key: 'bufferSize', input: 5.5, expected: 5 },
+        { key: 'bufferSize', input: -1, expected: 1 },
+        { key: 'padding', input: 'invalid', expected: 0.5 },
+        { key: 'padding', input: -0.1, expected: 0.01 },
+        { key: 'itemSize', input: -5, expected: 1 },
+        { key: 'itemSize', input: 1.5, expected: NaN },
+        { key: 'infinite', input: 'invalid', expected: false },
+        { key: 'horizontal', input: null, expected: false }
+      ];
+
+      cases.forEach(({ key, input, expected }) =>
+        expect({ key, value: parseSettings({ [key]: input })[key] }).toEqual({
+          key,
+          value: expected
+        })
+      );
+    });
+
+    test('accepts an HTML element', () => {
+      const element = document.createElement('div');
+      const settings = parseSettings({ viewportElement: element });
+
+      expect(settings.viewportElement).toBe(element);
+      expect(settings.viewport).toBe(element);
+    });
+
+    test('rejects an element-like object', () => {
+      const settings = parseSettings({ viewportElement: { nodeType: 1 } });
+
+      expect(settings.viewportElement).toBeNull();
+      expect(settings.viewport).toBeNull();
+    });
+  });
+
+  describe('Delayed initialization', () => {
+    makeTest({
+      config: {
+        ...baseConfig,
+        datasourceDevSettings: { initDelay },
+        timeout: 1000,
+        skipInvariantAutoCheck: true // test disposes the host in-body
+      },
+      title: 'should initialize after the configured delay',
+      it: misc => async () => {
+        expect(misc.workflow.isInitialized).toBe(false);
+        expect(misc.adapter.init).toBe(false);
+
+        await misc.waitForAdapterInit();
+        await misc.adapter.relax();
+
+        expect(misc.workflow.isInitialized).toBe(true);
+        expect(misc.adapter.init).toBe(true);
+        misc.expect.domMatchesBuffer();
+
+        const workflow = misc.workflow;
+        const adapter = misc.adapter;
+        misc.dispose();
+
+        expect(workflow.isInitialized).toBe(false);
+        expect(workflow.disposed).toBe(true);
+        expect(adapter.init).toBe(false);
+      }
+    });
+
+    makeTest({
+      config: {
+        ...baseConfig,
+        datasourceDevSettings: { initDelay },
+        timeout: 1000,
+        skipInvariantAutoCheck: true // test disposes the host in-body
+      },
+      title: 'should remain disposed when destroyed before initialization',
+      it: misc => async () => {
+        const workflow = misc.workflow;
+        const adapter = misc.adapter;
+
+        expect(workflow.isInitialized).toBe(false);
+        expect(adapter.init).toBe(false);
+
+        misc.dispose();
+        await misc.delay(initDelay * 2);
+
+        expect(workflow.isInitialized).toBe(false);
+        expect(workflow.disposed).toBe(true);
+        expect(adapter.init).toBe(false);
+      }
+    });
+  });
+
+  makeTest({
+    config: baseConfig,
+    title: 'should keep simultaneous workflows independent',
+    it: first => async () => {
+      const second = new TestHost(baseConfig);
+
+      try {
+        await Promise.all([first.relaxNext(), second.relaxNext()]);
+        first.expect.domMatchesBuffer();
+        second.expect.domMatchesBuffer();
+        expect(first.adapter.id).not.toBe(second.adapter.id);
+        expect(first.adapter.version).toBe(second.adapter.version);
+
+        const firstCycles = first.workflow.cyclesDone;
+        const secondState = {
+          cycles: second.workflow.cyclesDone,
+          position: second.getScrollPosition(),
+          bufferInfo: { ...second.adapter.bufferInfo }
+        };
+        const firstLoading: boolean[] = [];
+        const secondLoading: boolean[] = [];
+        const offFirst = first.adapter.isLoading$.on(value =>
+          firstLoading.push(value)
+        );
+        const offSecond = second.adapter.isLoading$.on(value =>
+          secondLoading.push(value)
+        );
+
+        await first.scrollToRelax(400);
+        offFirst();
+        offSecond();
+
+        expect(firstLoading).toEqual([true, false]);
+        expect(secondLoading).toEqual([]);
+        expect(first.workflow.cyclesDone).toBeGreaterThan(firstCycles);
+        expect({
+          cycles: second.workflow.cyclesDone,
+          position: second.getScrollPosition(),
+          bufferInfo: second.adapter.bufferInfo
+        }).toEqual(secondState);
+      } finally {
+        second.dispose();
+      }
+    }
+  });
+});
diff --git a/tests/e2e/specs/datasource.spec.ts b/tests/e2e/specs/datasource.spec.ts
new file mode 100644
index 00000000..77677cc3
--- /dev/null
+++ b/tests/e2e/specs/datasource.spec.ts
@@ -0,0 +1,113 @@
+import {
+  getDatasource,
+  IDatasource,
+  makeDatasource,
+  makeTest,
+  Misc,
+  Settings,
+  TestConfig,
+  TestItem
+} from '../scaffolding';
+
+const createItems = (index: number, count: number): TestItem[] =>
+  Array.from({ length: count }, (_, offset) => {
+    const current = index + offset;
+    return { id: current, text: `item #${current}` };
+  });
+
+class ClassDatasource implements IDatasource<TestItem> {
+  settings: Settings<TestItem> = {};
+
+  get(index: number, count: number, success: (data: TestItem[]) => void): void {
+    success(createItems(index, count));
+  }
+
+  reset(): void { }
+}
+
+const expectFetched = (misc: Misc) => async () => {
+  await misc.relaxNext();
+  expect(misc.scroller.state.fetch.callCount).toBeGreaterThan(0);
+  expect(misc.scroller.buffer.size).toBeGreaterThan(0);
+  misc.expect.domMatchesBuffer();
+};
+
+const expectEmpty = (misc: Misc) => async () => {
+  await misc.relaxNext();
+  const { buffer, state } = misc.scroller;
+  expect(misc.innerLoopCount).toBe(1);
+  expect(state.fetch.callCount).toBe(0);
+  expect(buffer.size).toBe(0);
+  expect(buffer.bof.get()).toBe(true);
+  expect(buffer.eof.get()).toBe(true);
+};
+
+const scopes = ['infinite', 'limited'] as const;
+const modes = ['observable', 'promise', 'callback'] as const;
+const Datasource = makeDatasource();
+
+describe('Datasource Class', () => {
+  makeTest({
+    config: { datasource: () => new ClassDatasource() },
+    title: 'should run Workflow with a class-based datasource',
+    it: expectFetched
+  });
+
+  makeTest({
+    config: {
+      datasource: () =>
+        new Datasource<TestItem>({
+          get: (index, count, success) => success(createItems(index, count)),
+          settings: { startIndex: 1 },
+          devSettings: { throttle: 1 }
+        }),
+      datasourceSettings: { startIndex: 42 },
+      datasourceDevSettings: { throttle: 17 }
+    },
+    title: 'should apply settings to a constructed datasource',
+    it: misc => async () => {
+      await misc.relaxNext();
+      expect(misc.scroller.settings.startIndex).toBe(42);
+      expect(misc.scroller.settings.throttle).toBe(17);
+    }
+  });
+});
+
+describe('Datasource Get', () => {
+  ([
+    { suite: 'immediate', delay: 0 },
+    { suite: 'non-immediate', delay: 1 }
+  ]).forEach(timing =>
+    describe(timing.suite, () => {
+      scopes.forEach(scope =>
+        modes.forEach(mode => {
+          const config: TestConfig = {
+            datasource: () =>
+              getDatasource({
+                ...(scope === 'limited' ? { min: 1, max: 100 } : {}),
+                mode,
+                delay: timing.delay
+              })
+          };
+          makeTest({
+            config,
+            title: `should run Workflow with ${scope} ${mode}-based datasource`,
+            it: expectFetched
+          });
+        })
+      );
+    })
+  );
+
+  describe('empty', () => {
+    for (const mode of ['callback', 'observable'] as const) {
+      makeTest({
+        config: {
+          datasource: () => getDatasource({ min: 1, max: 0, mode })
+        },
+        title: `should stop without fetching (${mode})`,
+        it: expectEmpty
+      });
+    }
+  });
+});
diff --git a/tests/e2e/specs/direction-priority.spec.ts b/tests/e2e/specs/direction-priority.spec.ts
new file mode 100644
index 00000000..4d006925
--- /dev/null
+++ b/tests/e2e/specs/direction-priority.spec.ts
@@ -0,0 +1,126 @@
+import {
+  Direction,
+  getDatasource,
+  makeTest,
+  Misc,
+  TestConfig
+} from '../scaffolding';
+
+interface Scenario {
+  title: string;
+  priority: Direction;
+  getSize: (index: number) => number;
+  scrollPosition?: number;
+  expected: {
+    firstIndex?: number;
+    lastIndex?: number;
+    atMax?: boolean;
+  };
+}
+
+interface TestCase {
+  scenario: Scenario;
+  config: TestConfig;
+}
+
+const minIndex = 0;
+const maxIndex = 99;
+const itemSize = 20;
+const baseDsSettings = { startIndex: maxIndex, minIndex, maxIndex };
+
+const scenarios: Scenario[] = [
+  {
+    title:
+      'should stay at the bottom edge when odd items are big (fwd on init)',
+    priority: Direction.forward,
+    getSize: index => (index % 2 === 0 ? 50 : 100),
+    expected: { lastIndex: maxIndex, atMax: true }
+  },
+  {
+    title:
+      'should stay at the bottom edge when even items are big (fwd on init)',
+    priority: Direction.forward,
+    getSize: index => (index % 2 !== 0 ? 50 : 100),
+    expected: { lastIndex: maxIndex, atMax: true }
+  },
+  {
+    title:
+      'should stay at the bottom edge when odd items are big (bwd on init)',
+    priority: Direction.backward,
+    getSize: index => (index % 2 === 0 ? 50 : 100),
+    expected: { lastIndex: maxIndex, atMax: true }
+  },
+  {
+    title:
+      'should not stay at the bottom edge when even items are big (bwd on init)',
+    priority: Direction.backward,
+    getSize: index => (index % 2 !== 0 ? 50 : 100),
+    expected: { lastIndex: maxIndex - 1, atMax: false }
+  },
+  {
+    title: 'should not shift position (bwd on scroll)',
+    priority: Direction.backward,
+    getSize: index => (index >= 80 ? itemSize : 100),
+    scrollPosition: 75 * itemSize,
+    expected: { firstIndex: 75 }
+  },
+  {
+    title: 'should shift position (fwd on scroll)',
+    priority: Direction.forward,
+    getSize: index => (index >= 80 ? itemSize : 100),
+    scrollPosition: 75 * itemSize,
+    expected: { firstIndex: 79 }
+  }
+];
+
+const cases: TestCase[] = scenarios.map(scenario => ({
+  scenario,
+  config: {
+    datasource: () => getDatasource({ min: minIndex, max: maxIndex }),
+    datasourceSettings: {
+      ...baseDsSettings,
+      ...(scenario.scrollPosition === undefined ? {} : { itemSize })
+    },
+    datasourceDevSettings: { directionPriority: scenario.priority },
+    templateSettings: { viewportHeight: 200, dynamicSize: 'size' }
+  }
+}));
+
+const expectResult = (misc: Misc, scenario: Scenario): void => {
+  const { firstIndex, lastIndex, atMax } = scenario.expected;
+
+  if (firstIndex !== undefined) {
+    expect(misc.adapter.firstVisible.$index).toBe(firstIndex);
+  }
+  if (lastIndex !== undefined) {
+    expect(misc.adapter.lastVisible.$index).toBe(lastIndex);
+  }
+  if (atMax !== undefined) {
+    const maxPosition = misc.getScrollableSize() - misc.getViewportSize();
+    if (atMax) {
+      expect(misc.getScrollPosition()).toBe(maxPosition);
+    } else {
+      expect(misc.getScrollPosition()).not.toBe(maxPosition);
+    }
+  }
+};
+
+describe('Direction Priority Spec', () =>
+  cases.forEach(({ scenario, config }) =>
+    makeTest({
+      config,
+      title: scenario.title,
+      before: misc =>
+        misc.setItemProcessor(({ $index, data }) => {
+          data.size = scenario.getSize($index);
+        }),
+      it: misc => async () => {
+        await misc.relaxNext();
+        if (scenario.scrollPosition !== undefined) {
+          await misc.scrollToRelax(scenario.scrollPosition);
+        }
+        misc.expect.domMatchesBuffer();
+        expectResult(misc, scenario);
+      }
+    })
+  ));
diff --git a/tests/e2e/specs/dynamic-height-reload.spec.ts b/tests/e2e/specs/dynamic-height-reload.spec.ts
new file mode 100644
index 00000000..e1f9d37c
--- /dev/null
+++ b/tests/e2e/specs/dynamic-height-reload.spec.ts
@@ -0,0 +1,49 @@
+import {
+  getDatasource,
+  getDynamicSize,
+  makeTest,
+  SizeStrategy,
+  TestConfig
+} from '../scaffolding';
+
+const reloadIndexes = [
+  -99, -98, -90, -75, -35, -20, -10, -5, -2, -1, 0, 1, 2, 5, 10, 20, 35, 50, 75,
+  90
+];
+
+const baseConfig: TestConfig = {
+  datasource: () => getDatasource({ min: -99, max: 100 }),
+  datasourceSettings: {
+    startIndex: 1,
+    padding: 0.5,
+    bufferSize: 10,
+    minIndex: -99,
+    maxIndex: 100,
+    itemSize: 20,
+    sizeStrategy: SizeStrategy.Average
+  },
+  templateSettings: { viewportHeight: 600, dynamicSize: 'size' },
+  timeout: 4000
+};
+
+describe('Dynamic Size Reload Spec', () => {
+  reloadIndexes.forEach(reloadIndex =>
+    makeTest({
+      config: baseConfig,
+      title: 'should reload properly',
+      meta: `reloadIndex: ${reloadIndex}`,
+      before: misc =>
+        misc.setItemProcessor(({ $index, data }) => {
+          data.size = getDynamicSize($index);
+        }),
+      it: misc => async () => {
+        await misc.relaxNext();
+        await misc.adapter.reload(reloadIndex);
+        await misc.adapter.relax();
+
+        misc.expect.domMatchesBuffer();
+        expect(misc.adapter.firstVisible.$index).toBe(reloadIndex);
+      }
+    })
+  );
+});
diff --git a/tests/e2e/specs/dynamic-height-scroll.spec.ts b/tests/e2e/specs/dynamic-height-scroll.spec.ts
new file mode 100644
index 00000000..b775344b
--- /dev/null
+++ b/tests/e2e/specs/dynamic-height-scroll.spec.ts
@@ -0,0 +1,115 @@
+import {
+  getDatasource,
+  getDynamicSize,
+  makeTest,
+  Misc,
+  SizeStrategy,
+  TestConfig,
+  TestItem
+} from '../scaffolding';
+
+const takeLayoutSnapshot = (misc: Misc) => {
+  const { buffer, viewport } = misc.scroller;
+  return {
+    viewportSize: viewport.getSize(),
+    scrollableSize: viewport.getScrollableSize(),
+    backwardPadding: viewport.paddings.backward.size,
+    forwardPadding: viewport.paddings.forward.size,
+    bufferSize: buffer.size,
+    firstIndex: buffer.firstIndex,
+    lastIndex: buffer.lastIndex,
+    defaultSize: buffer.defaultSize
+  };
+};
+
+const createItems = (start: number, count: number): TestItem[] =>
+  Array.from({ length: count }, (_, offset) => {
+    const index = start + offset;
+    return {
+      id: index,
+      text: `item #${index}`,
+      size: getDynamicSize(index)
+    };
+  });
+
+const registerFetchCase = (strategy: SizeStrategy): void => {
+  const config: TestConfig = {
+    datasource: () => getDatasource({ min: 1, max: 20 }),
+    datasourceSettings: {
+      startIndex: 1,
+      padding: 0.5,
+      bufferSize: 5,
+      minIndex: 1,
+      maxIndex: 20,
+      itemSize: 20,
+      sizeStrategy: strategy
+    },
+    templateSettings: { viewportHeight: 100, dynamicSize: 'size' }
+  };
+
+  makeTest({
+    config,
+    title: `should fetch properly (${strategy})`,
+    before: misc =>
+      misc.setItemProcessor(({ $index, data }) => {
+        data.size = $index === 1 ? 200 : 20;
+      }),
+    it: misc => async () => {
+      await misc.relaxNext();
+      const before = takeLayoutSnapshot(misc);
+
+      await misc.scrollToRelax(100);
+
+      expect(takeLayoutSnapshot(misc)).toEqual(before);
+      misc.expect.domMatchesBuffer();
+    }
+  });
+};
+
+const registerAppendCase = (strategy: SizeStrategy): void => {
+  const maxIndex = 100;
+  const appendCount = 50;
+  const config: TestConfig = {
+    datasource: () => getDatasource({ min: -99, max: maxIndex + appendCount }),
+    datasourceSettings: {
+      startIndex: 50,
+      minIndex: -99,
+      maxIndex,
+      padding: 0.5,
+      bufferSize: 5,
+      itemSize: 20,
+      sizeStrategy: strategy
+    },
+    templateSettings: { viewportHeight: 200, dynamicSize: 'size' }
+  };
+
+  makeTest({
+    config,
+    title: `should append properly (${strategy})`,
+    before: misc =>
+      misc.setItemProcessor(({ $index, data }) => {
+        data.size = getDynamicSize($index);
+      }),
+    it: misc => async () => {
+      await misc.relaxNext();
+      await misc.adapter.append({
+        items: createItems(maxIndex + 1, appendCount),
+        eof: true
+      });
+
+      await misc.scrollMaxRelax();
+      const innerLoopCount = misc.innerLoopCount;
+      await misc.scrollMaxRelax();
+
+      expect(misc.innerLoopCount).toBe(innerLoopCount + 1);
+      misc.expect.domMatchesBuffer();
+    }
+  });
+};
+
+describe('Dynamic Size Scroll Spec', () => {
+  for (const strategy of [SizeStrategy.Average, SizeStrategy.Frequent]) {
+    registerFetchCase(strategy);
+    registerAppendCase(strategy);
+  }
+});
diff --git a/tests/e2e/specs/dynamic-height-update.spec.ts b/tests/e2e/specs/dynamic-height-update.spec.ts
new file mode 100644
index 00000000..54b7e53b
--- /dev/null
+++ b/tests/e2e/specs/dynamic-height-update.spec.ts
@@ -0,0 +1,122 @@
+import {
+  getDatasource,
+  makeTest,
+  Misc,
+  SizeStrategy,
+  TestConfig
+} from '../scaffolding';
+
+interface Scenario {
+  title: string;
+  limits: { min: number; max: number };
+  getSize: (index: number) => number;
+  action: (misc: Misc) => Promise<unknown>;
+  defaultSize: { initial: number; final: number };
+}
+
+const itemSize = 20;
+const firstFifteen = Array.from({ length: 15 }, (_, index) => index + 1);
+
+const scenarios: Scenario[] = [
+  {
+    title: 'should remove one big item via Adapter.update',
+    limits: { min: 1, max: 50 },
+    getSize: index => (index === 10 ? 100 : itemSize),
+    action: misc =>
+      misc.adapter.update({ predicate: ({ $index }) => $index !== 10 }),
+    defaultSize: { initial: 25, final: itemSize }
+  },
+  {
+    title: 'should remove one big item via Adapter.remove in-buffer',
+    limits: { min: 1, max: 50 },
+    getSize: index => (index === 10 ? 100 : itemSize),
+    action: misc =>
+      misc.adapter.remove({ predicate: ({ $index }) => $index === 10 }),
+    defaultSize: { initial: 25, final: itemSize }
+  },
+  {
+    title: 'should remove some items via Adapter.remove virtually',
+    limits: { min: 1, max: 35 },
+    getSize: index => index + itemSize,
+    action: async misc => {
+      await misc.scrollToIndexRelax(35);
+      await misc.adapter.remove({ indexes: firstFifteen });
+    },
+    defaultSize: { initial: 28, final: 46 }
+  },
+  {
+    title:
+      'should remove some items via Adapter.remove virtually (interrupted)',
+    limits: { min: 1, max: 35 },
+    getSize: index => index + itemSize,
+    action: async misc => {
+      await misc.scrollToIndexRelax(35);
+      await misc.adapter.remove({
+        indexes: [1, 2, 3, 4, 5, 11, 12, 13, 14, 15]
+      });
+    },
+    defaultSize: { initial: 28, final: 42 }
+  },
+  {
+    title:
+      'should remove one big item in-buffer and another one virtually via Adapter.remove',
+    limits: { min: 1, max: 35 },
+    getSize: index => (index === 1 || index === 35 ? 100 : itemSize),
+    action: async misc => {
+      await misc.scrollToIndexRelax(35);
+      await misc.adapter.remove({ indexes: [1, 35] });
+    },
+    defaultSize: { initial: 25, final: itemSize }
+  },
+  {
+    title:
+      'should remove one big item in-buffer and another one virtually via Adapter.remove (inverted)',
+    limits: { min: 1, max: 35 },
+    getSize: index => (index === 3 || index === 33 ? 100 : itemSize),
+    action: async misc => {
+      await misc.scrollToIndexRelax(35);
+      await misc.scrollMinRelax();
+      await misc.adapter.remove({ indexes: [3, 33] });
+    },
+    defaultSize: { initial: 25, final: itemSize }
+  }
+];
+
+const baseSettings: NonNullable<TestConfig['datasourceSettings']> = {
+  startIndex: 1,
+  padding: 0.5,
+  bufferSize: 5,
+  itemSize,
+  sizeStrategy: SizeStrategy.Average
+};
+
+describe('Dynamic Size Update Spec', () => {
+  scenarios.forEach(scenario =>
+    makeTest({
+      config: {
+        datasource: () => getDatasource(scenario.limits),
+        datasourceSettings: baseSettings,
+        templateSettings: { viewportHeight: 200, dynamicSize: 'size' },
+        timeout: 4000
+      },
+      title: scenario.title,
+      before: misc =>
+        misc.setItemProcessor(({ $index, data }) => {
+          data.size = scenario.getSize($index);
+        }),
+      it: misc => async () => {
+        await misc.relaxNext();
+        expect(misc.scroller.buffer.defaultSize).toBe(
+          scenario.defaultSize.initial
+        );
+
+        await scenario.action(misc);
+
+        expect(misc.scroller.buffer.defaultSize).toBe(
+          scenario.defaultSize.final
+        );
+        misc.expect.domIndexesMatchBuffer();
+      }
+    })
+  );
+});
diff --git a/tests/e2e/specs/dynamic-size.average.spec.ts b/tests/e2e/specs/dynamic-size.average.spec.ts
new file mode 100644
index 00000000..f8415fb1
--- /dev/null
+++ b/tests/e2e/specs/dynamic-size.average.spec.ts
@@ -0,0 +1,285 @@
+import {
+  Direction,
+  getDatasource,
+  getDynamicSize,
+  makeTest,
+  Misc,
+  SizeStrategy,
+  TestConfig
+} from '../scaffolding';
+
+/**
+ * Settled layout captured EMPIRICALLY for a load scenario. `defaultSize` and the
+ * paddings come from the Average size strategy's own measurements, so they are
+ * harvested rather than recomputed (recomputing would re-implement the strategy).
+ */
+interface LayoutSnapshot {
+  range: [number, number];
+  defaultSize: number;
+  backwardPadding: number;
+  forwardPadding: number;
+  innerLoopCount: number;
+}
+
+interface LoadScenario {
+  settings: NonNullable<TestConfig['datasourceSettings']> & {
+    startIndex: number;
+  };
+  template?: TestConfig['templateSettings'];
+  expected: LayoutSnapshot;
+  firstForwardPadding?: number;
+}
+
+const sourceLimits = { min: -50, max: 99 };
+const baseTemplate = { viewportHeight: 100, dynamicSize: 'size' };
+
+const initialScenarios: LoadScenario[] = [
+  {
+    settings: { startIndex: 0, padding: 0.5, bufferSize: 5 },
+    template: { viewportHeight: 100 },
+    expected: {
+      range: [-5, 9],
+      defaultSize: 22,
+      backwardPadding: 0,
+      forwardPadding: 0,
+      innerLoopCount: 4
+    }
+  },
+  {
+    settings: {
+      startIndex: 0,
+      padding: 0.5,
+      bufferSize: 5,
+      minIndex: -20,
+      maxIndex: 10
+    },
+    template: { viewportHeight: 100 },
+    expected: {
+      range: [-5, 9],
+      defaultSize: 22,
+      backwardPadding: 330,
+      forwardPadding: 22,
+      innerLoopCount: 4
+    }
+  },
+  {
+    settings: { startIndex: -5, padding: 1.2, bufferSize: 1 },
+    template: { viewportHeight: 250 },
+    expected: {
+      range: [-50, 31],
+      defaultSize: 17,
+      backwardPadding: 0,
+      forwardPadding: 0,
+      innerLoopCount: 8
+    }
+  },
+  {
+    settings: {
+      startIndex: 0,
+      padding: 0.25,
+      bufferSize: 10,
+      windowViewport: true
+    },
+    template: { noViewportClass: true, viewportHeight: 0 },
+    expected: {
+      range: [-30, 38],
+      defaultSize: 25,
+      backwardPadding: 0,
+      forwardPadding: 0,
+      innerLoopCount: 6
+    }
+  },
+  {
+    settings: {
+      startIndex: 20,
+      padding: 0.75,
+      bufferSize: 15,
+      horizontal: true
+    },
+    template: { viewportWidth: 300, horizontal: true },
+    expected: {
+      range: [5, 34],
+      defaultSize: 40,
+      backwardPadding: 0,
+      forwardPadding: 0,
+      innerLoopCount: 3
+    }
+  }
+];
+
+const lackScenarios: LoadScenario[] = [
+  {
+    settings: {
+      startIndex: -25,
+      padding: 1.2,
+      bufferSize: 1,
+      minIndex: -50
+    },
+    template: { viewportHeight: 250 },
+    expected: {
+      range: [-50, 99],
+      defaultSize: 47,
+      backwardPadding: 0,
+      forwardPadding: 0,
+      innerLoopCount: 8
+    },
+    firstForwardPadding: 249
+  },
+  {
+    settings: {
+      startIndex: 11,
+      padding: 0.7,
+      bufferSize: 7,
+      minIndex: 1
+    },
+    template: { viewportHeight: 350 },
+    expected: {
+      range: [1, 28],
+      defaultSize: 35,
+      backwardPadding: 0,
+      forwardPadding: 0,
+      innerLoopCount: 5
+    },
+    firstForwardPadding: 112
+  },
+  {
+    settings: {
+      startIndex: 1,
+      padding: 0.15,
+      bufferSize: 9,
+      minIndex: -10,
+      windowViewport: true
+    },
+    template: { noViewportClass: true, viewportHeight: 0 },
+    expected: {
+      range: [-8, 36],
+      defaultSize: 34,
+      backwardPadding: 68,
+      forwardPadding: 0,
+      innerLoopCount: 4
+    },
+    firstForwardPadding: 543
+  },
+  {
+    settings: {
+      startIndex: -10,
+      padding: 0.75,
+      bufferSize: 4,
+      minIndex: -20,
+      horizontal: true
+    },
+    template: { viewportWidth: 300, horizontal: true },
+    expected: {
+      range: [-20, 33],
+      defaultSize: 27,
+      backwardPadding: 0,
+      forwardPadding: 0,
+      innerLoopCount: 5
+    },
+    firstForwardPadding: 254
+  }
+];
+
+const scrollScenarios = initialScenarios.filter(
+  (_scenario, index) => index !== 2 && index !== 3
+);
+
+const createConfig = (scenario: LoadScenario): TestConfig => ({
+  datasource: () => getDatasource(sourceLimits),
+  datasourceSettings: {
+    sizeStrategy: SizeStrategy.Average,
+    ...scenario.settings
+  },
+  templateSettings: { ...baseTemplate, ...scenario.template },
+  timeout: 4000
+});
+
+const takeLayoutSnapshot = (misc: Misc): LayoutSnapshot => ({
+  range: [
+    misc.adapter.bufferInfo.firstIndex,
+    misc.adapter.bufferInfo.lastIndex
+  ],
+  defaultSize: misc.scroller.buffer.defaultSize,
+  backwardPadding: misc.padding.backward.getSize(),
+  forwardPadding: misc.padding.forward.getSize(),
+  innerLoopCount: misc.innerLoopCount
+});
+
+const setDynamicSizes = (misc: Misc): void =>
+  misc.setItemProcessor(({ $index, data }) => {
+    data.size = getDynamicSize($index);
+  });
+
+const registerLoadScenario = (scenario: LoadScenario, index: number): void =>
+  makeTest({
+    config: createConfig(scenario),
+    title:
+      scenario.firstForwardPadding !== undefined
+        ? `should load with fwd padding shift (${index})`
+        : `should fill the viewport with paddings (${index})`,
+    before: setDynamicSizes,
+    it: misc => async () => {
+      const cycleDone = misc.waitNextCycle();
+      const loops = await misc.captureInnerLoops(
+        scenario.expected.innerLoopCount,
+        () => ({
+          forwardPadding: misc.padding.forward.getSize(),
+          indexes: misc.scroller.buffer.items.map(item => item.$index),
+          firstIndex: misc.adapter.bufferInfo.firstIndex,
+          lastIndex: misc.adapter.bufferInfo.lastIndex
+        })
+      );
+      await cycleDone;
+      await misc.adapter.relax();
+
+      // structural (captured, not predicted): the buffer is a strictly
+      // contiguous range at every inner loop of the progressive fill
+      loops.forEach(({ indexes, firstIndex, lastIndex }) =>
+        expect(indexes).toEqual(
+          Array.from(
+            { length: lastIndex - firstIndex + 1 },
+            (_, offset) => firstIndex + offset
+          )
+        )
+      );
+
+      misc.expect.domMatchesBuffer();
+      misc.expect.startVisible(scenario.settings.startIndex);
+
+      expect(takeLayoutSnapshot(misc)).toEqual(scenario.expected);
+      if (scenario.firstForwardPadding !== undefined) {
+        expect(loops[0].forwardPadding).toBe(scenario.firstForwardPadding);
+      }
+    }
+  });
+
+describe('Dynamic Size Spec for Average strategy', () => {
+  describe('Initial load', () =>
+    initialScenarios.forEach((scenario, index) =>
+      registerLoadScenario(scenario, index)
+    ));
+
+  describe('Lack of items on 1st fetch', () =>
+    lackScenarios.forEach((scenario, index) =>
+      registerLoadScenario(scenario, index)
+    ));
+
+  describe('After scroll', () =>
+    scrollScenarios.forEach((scenario, index) =>
+      makeTest({
+        config: createConfig(scenario),
+        title: `should fill the viewport with paddings (${index})`,
+        before: setDynamicSizes,
+        it: misc => async () => {
+          await misc.relaxNext();
+          await misc.reachEdge(Direction.forward);
+          expect(misc.scroller.buffer.eof.get()).toBe(true);
+
+          await misc.reachEdge(Direction.backward);
+
+          expect(misc.scroller.buffer.bof.get()).toBe(true);
+          misc.expect.domMatchesBuffer();
+        }
+      })
+    ));
+});
diff --git a/tests/e2e/specs/dynamic-size.frequent.spec.ts b/tests/e2e/specs/dynamic-size.frequent.spec.ts
new file mode 100644
index 00000000..50e095dc
--- /dev/null
+++ b/tests/e2e/specs/dynamic-size.frequent.spec.ts
@@ -0,0 +1,181 @@
+import {
+  getDatasource,
+  makeTest,
+  Misc,
+  SizeStrategy,
+  TestConfig
+} from '../scaffolding';
+
+type Action =
+  | { type: 'scroll'; positions: Array<'min' | 'max' | number> }
+  | { type: 'check'; indexes: number[]; size: number };
+
+interface Scenario {
+  title: string;
+  getSize: (index: number) => number;
+  initialDefault: number;
+  finalDefault?: number;
+  action?: Action;
+}
+
+const settings = {
+  padding: 0.5,
+  bufferSize: 5,
+  startIndex: 1,
+  minIndex: -99,
+  maxIndex: 100
+};
+
+const frequentScenarios: Scenario[] = [
+  {
+    title: 'set default on load (0)',
+    getSize: () => 20,
+    initialDefault: 20
+  },
+  {
+    title: 'set default on load (1)',
+    getSize: index => (index < 0 ? -index : index === 0 ? 1 : index),
+    initialDefault: 1
+  },
+  {
+    title: 'change default on scroll min',
+    getSize: index => (index < 0 ? 20 : 30),
+    action: { type: 'scroll', positions: ['min'] },
+    initialDefault: 30,
+    finalDefault: 20
+  },
+  {
+    title: 'not change default on scroll max',
+    getSize: index => (index < 0 ? 20 : 30),
+    action: { type: 'scroll', positions: ['max'] },
+    initialDefault: 30
+  },
+  {
+    title: 'not change default on scroll max & min',
+    getSize: index => (index < 0 ? 20 : 30),
+    action: { type: 'scroll', positions: ['max', 'min'] },
+    initialDefault: 30
+  },
+  {
+    title: 'change default on scroll max & min & 100',
+    getSize: index => (index < 0 ? 20 : 30),
+    action: { type: 'scroll', positions: ['max', 'min', 100] },
+    initialDefault: 30,
+    finalDefault: 20
+  },
+  {
+    title: 'change default on Adapter.check',
+    getSize: index =>
+      index >= -2 && index <= 2 ? 2 : index < 0 ? -index : index,
+    action: { type: 'check', indexes: [5, 6, 7, 8, 9, 10], size: 1 },
+    initialDefault: 2,
+    finalDefault: 1
+  },
+  {
+    title: 'not change default on Adapter.check',
+    getSize: index =>
+      index >= -2 && index <= 2 ? 2 : index < 0 ? -index : index,
+    action: { type: 'check', indexes: [5, 6, 7, 8, 9], size: 1 },
+    initialDefault: 2,
+    finalDefault: 2
+  }
+];
+
+const constantScenarios: Scenario[] = frequentScenarios
+  .filter((_scenario, index) => index % 2 === 0)
+  .map((scenario, index) => ({
+    ...scenario,
+    title: `not change (${index + 1})`,
+    initialDefault: 22,
+    finalDefault: 22
+  }));
+
+const runAction = async (misc: Misc, action: Action): Promise<void> => {
+  if (action.type === 'scroll') {
+    for (const position of action.positions) {
+      if (position === 'min') {
+        await misc.scrollMinRelax();
+      } else if (position === 'max') {
+        await misc.scrollMaxRelax();
+      } else {
+        await misc.scrollToRelax(position);
+      }
+    }
+    return;
+  }
+
+  action.indexes.forEach(index => {
+    const element = misc.getElement(index);
+    if (!element) {
+      throw new Error(`Item ${index} is not rendered`);
+    }
+    element.style.height = `${action.size}px`;
+  });
+  await misc.adapter.check();
+};
+
+const expectHealthyState = (misc: Misc): void => {
+  misc.expect.domMatchesBuffer();
+  expect(misc.padding.backward.getSize()).toBeGreaterThanOrEqual(0);
+  expect(misc.padding.forward.getSize()).toBeGreaterThanOrEqual(0);
+  expect(misc.getScrollableSize()).toBeGreaterThanOrEqual(
+    misc.getViewportSize()
+  );
+  misc.expect.visibleWithinBuffer();
+};
+
+const registerScenario = (
+  strategy: SizeStrategy,
+  scenario: Scenario,
+  configuredSize?: number
+): void => {
+  const config: TestConfig = {
+    datasource: () => getDatasource({ min: -99, max: 100 }),
+    datasourceSettings: {
+      ...settings,
+      sizeStrategy: strategy,
+      ...(configuredSize === undefined ? {} : { itemSize: configuredSize })
+    },
+    templateSettings: { viewportHeight: 200, dynamicSize: 'size' }
+  };
+
+  makeTest({
+    config,
+    title: `should ${scenario.title}`,
+    before: misc =>
+      misc.setItemProcessor(({ $index, data }) => {
+        data.size = scenario.getSize($index);
+      }),
+    it: misc => async () => {
+      await misc.relaxNext();
+      expect(misc.scroller.buffer.defaultSize).toBe(scenario.initialDefault);
+      expectHealthyState(misc);
+
+      if (scenario.action) {
+        await runAction(misc, scenario.action);
+        expect(misc.scroller.buffer.defaultSize).toBe(
+          scenario.finalDefault ?? scenario.initialDefault
+        );
+        expectHealthyState(misc);
+      }
+    }
+  });
+};
+
+describe('Dynamic Size Spec for Frequent and Constant strategies', () => {
+  describe('SizeStrategy.Frequent', () =>
+    frequentScenarios.forEach(scenario =>
+      registerScenario(SizeStrategy.Frequent, scenario)
+    ));
+
+  describe('SizeStrategy.Constant', () => {
+    constantScenarios.forEach(scenario =>
+      registerScenario(SizeStrategy.Constant, scenario, 22)
+    );
+    registerScenario(SizeStrategy.Constant, {
+      title: 'not change when itemSize is not set',
+      getSize: () => 10,
+      initialDefault: 10
+    });
+  });
+});
diff --git a/tests/e2e/specs/dynamic-size.zero.spec.ts b/tests/e2e/specs/dynamic-size.zero.spec.ts
index 9fb4efd8..e01fc1d6 100644
--- a/tests/e2e/specs/dynamic-size.zero.spec.ts
+++ b/tests/e2e/specs/dynamic-size.zero.spec.ts
@@ -1,175 +1,73 @@
-import { test, expect } from '@playwright/test';
-import { Direction } from '../fixture/VScrollFixture.js';
-import { afterEachLogs } from '../fixture/after-each-logs.js';
-import { createFixture } from '../fixture/create-fixture.js';
-import { ITestConfig } from 'types/index.js';
-import { SizeStrategy } from '../../../src/index.js';
+import { getDatasource, makeTest, SizeStrategy } from '../scaffolding';
 
-test.afterEach(afterEachLogs);
-
-// // Capture console logs for comparison
-// test.beforeEach(async ({ page }) => {
-//   page.on('console', msg => {
-//     console.log('[BROWSER]', msg.text());
-//   });
-// });
-
-type WithAsyncSize = Window & { __vscrollAsyncSize?: number };
-
-const dynamicTemplate = (item: {
-  $index: number;
-  data: { id: number; text: string; size?: number };
-}): string => {
-  const size = item.data.size ?? 0;
-  return `<div class="item" style="height:${size}px">${item.$index}: ${item.data.text}</div>`;
-};
-
-const zeroSizeDatasourceGet: ITestConfig['datasourceGet'] = (
-  index,
-  count,
-  success
-) => {
-  const data = [];
-  for (let i = index; i < index + count; i++) {
-    if (i >= 1 && i <= 100) {
-      data.push({ id: i, text: `item #${i}`, size: 0 });
-    }
-  }
-  setTimeout(() => success(data), 0);
-};
-
-// Async resize datasource: its item size is controlled via a flag on window
-const asyncResizeDatasourceGet: ITestConfig['datasourceGet'] = (
-  index,
-  count,
-  success
-) => {
-  const data = [];
-  // eslint-disable-next-line @typescript-eslint/no-explicit-any
-  const size = ((window as any).__vscrollAsyncSize as number | undefined) ?? 0;
-  for (let i = index; i < index + count; i++) {
-    if (i >= 1 && i <= 100) {
-      data.push({ id: i, text: `item #${i}`, size });
-    }
-  }
-  setTimeout(() => success(data), 0);
-};
-
-const secondPackZeroSizeDatasourceGet: ITestConfig['datasourceGet'] = (
-  index,
-  count,
-  success
-) => {
-  const data = [];
-  for (let i = index; i < index + count; i++) {
-    if (i >= 1 && i <= 100) {
-      const size = i >= 6 ? 0 : 20;
-      data.push({ id: i, text: `item #${i}`, size });
-    }
-  }
-  setTimeout(() => success(data), 0);
-};
-
-const baseSettings = {
-  startIndex: 1,
-  bufferSize: 5,
-  minIndex: 1,
-  padding: 0.5,
-  sizeStrategy: SizeStrategy.Average
-} as const;
-
-const zeroSizeConfig: ITestConfig = {
-  datasourceGet: zeroSizeDatasourceGet,
-  datasourceSettings: { ...baseSettings },
-  templateSettings: { viewportHeight: 200 },
-  templateFn: dynamicTemplate
-};
-
-const secondPackConfig: ITestConfig = {
-  datasourceGet: secondPackZeroSizeDatasourceGet,
-  datasourceSettings: { ...baseSettings },
-  templateSettings: { viewportHeight: 200 },
-  templateFn: dynamicTemplate
-};
-
-const asyncResizeConfig: ITestConfig = {
-  datasourceGet: asyncResizeDatasourceGet,
+const baseConfig = {
   datasourceSettings: {
-    startIndex: 1,
     bufferSize: 5,
-    padding: 0.5,
+    minIndex: 1,
     sizeStrategy: SizeStrategy.Average
   },
-  templateSettings: { viewportHeight: 200 },
-  templateFn: dynamicTemplate
+  templateSettings: { dynamicSize: 'size', viewportHeight: 200 }
 };
 
-test.describe('Dynamic Zero Size Spec', () => {
-  test('Items with zero size: should stop the Workflow after the first loop', async ({
-    page
-  }) => {
-    const fixture = await createFixture({ page, config: zeroSizeConfig });
-
-    const cyclesDone = await fixture.workflow.cyclesDone;
-    const innerLoopCount = await fixture.workflow.innerLoopCount;
-    expect(cyclesDone).toBe(1);
-    expect(innerLoopCount).toBe(1);
-
-    await fixture.dispose();
-  });
-
-  test('Items with zero size started from 2 pack: should stop the Workflow after the second loop', async ({
-    page
-  }) => {
-    const fixture = await createFixture({ page, config: secondPackConfig });
-
-    const cyclesDone = await fixture.workflow.cyclesDone;
-    const innerLoopCount = await fixture.workflow.innerLoopCount;
-    expect(cyclesDone).toBe(1);
-    expect(innerLoopCount).toBe(2);
-
-    await fixture.dispose();
-  });
-
-  test('Items get non-zero size asynchronously: should continue the Workflow after re-size and check', async ({
-    page
-  }) => {
-    const fixture = await createFixture({ page, config: asyncResizeConfig });
-    const viewport = fixture.scroller.viewport;
-
-    const scrollableSizeBefore = await viewport.getScrollableSize();
-    const forwardPaddingBefore =
-      await viewport.paddings[Direction.forward].size;
-    expect(scrollableSizeBefore).toEqual(forwardPaddingBefore);
-    expect(scrollableSizeBefore).toBe(200);
-
-    // Switch datasource to produce size=20 for all future items
-    // and make currently rendered items non-zero-sized via adapter.fix updater
-    await page.evaluate(() => {
-      const w = window as WithAsyncSize;
-      w.__vscrollAsyncSize = 20;
-      const adapter = w.__vscroll__.datasource.adapter;
-      return adapter.fix({
-        updater: ({ element, data }) => {
-          (data as { size?: number }).size = 20;
-          const el = element as HTMLElement;
-          const child = (el.firstElementChild as HTMLElement) || el;
-          child.style.height = '20px';
-        }
-      });
-    });
-
-    await fixture.adapter.check();
-
-    const cyclesDone = await fixture.workflow.cyclesDone;
-    const scrollableSizeAfter = await viewport.getScrollableSize();
-    const forwardPaddingAfter = await viewport.paddings[Direction.forward].size;
-
-    expect(cyclesDone).toBe(2);
-    expect(forwardPaddingAfter).toBe(0);
-    expect(scrollableSizeAfter).toBeGreaterThan(0);
-    expect(scrollableSizeAfter).toBe(300);
-
-    await fixture.dispose();
-  });
+describe('Dynamic Zero Size Spec', () => {
+  describe('Items with zero size', () =>
+    makeTest({
+      config: {
+        ...baseConfig,
+        datasource: () => getDatasource({ min: 1, max: 100, size: 0 })
+      },
+      title: 'should stop the Workflow after the first loop',
+      it: misc => async () => {
+        await misc.relaxNext();
+        expect(misc.innerLoopCount).toEqual(1);
+      }
+    }));
+
+  describe('Items with zero size started from 2 pack', () =>
+    makeTest({
+      config: {
+        ...baseConfig,
+        datasource: () => getDatasource({ min: 1, max: 100 })
+      },
+      title: 'should stop the Workflow after the second loop',
+      it: misc => async () => {
+        misc.setItemProcessor(
+          ({ $index, data }) => (data.size = $index >= 6 ? 0 : 20)
+        );
+        await misc.relaxNext();
+        expect(misc.innerLoopCount).toEqual(2);
+      }
+    }));
+
+  describe('Items get non-zero size asynchronously', () =>
+    makeTest({
+      config: {
+        ...baseConfig,
+        datasource: () => getDatasource({ min: 1, max: 100, size: 0 })
+      },
+      title: 'should continue the Workflow after re-size and check',
+      it: misc => async () => {
+        const {
+          scroller: { viewport },
+          adapter
+        } = misc;
+        await misc.relaxNext();
+
+        expect(viewport.getScrollableSize()).toEqual(
+          viewport.paddings.forward.size
+        );
+        misc.setItemProcessor(({ data }) => (data.size = 20));
+        adapter.fix({
+          updater: ({ element, data }) => {
+            data.size = 20;
+            ((element as HTMLElement).children[0] as HTMLElement).style.height =
+              '20px';
+          }
+        });
+        await adapter.check();
+
+        expect(viewport.getScrollableSize()).toBeGreaterThan(0);
+        expect(viewport.paddings.forward.size).toEqual(0);
+      }
+    }));
 });
diff --git a/tests/e2e/specs/eof.spec.ts b/tests/e2e/specs/eof.spec.ts
index 016df814..6204bb2b 100644
--- a/tests/e2e/specs/eof.spec.ts
+++ b/tests/e2e/specs/eof.spec.ts
@@ -1,366 +1,256 @@
-import { test, expect, Page } from '@playwright/test';
 import {
-  VScrollFixture,
   Direction,
-  type DirectionType
-} from '../fixture/VScrollFixture.js';
-import { afterEachLogs } from '../fixture/after-each-logs.js';
-import { createFixture } from '../fixture/create-fixture.js';
-import { ITestConfig } from 'types/index.js';
-
-test.afterEach(afterEachLogs);
-
-const min = 1;
-const max = 100;
-const scrollCount = 10;
-
-type IConfig = ITestConfig;
-
-// Limited datasource: items [1..100]
-const datasourceGetLimited = (index, count, success) => {
-  const data = [];
-  for (let i = index; i < index + count; i++) {
-    if (i >= 1 && i <= 100) {
-      data.push({ id: i, text: `item #${i}` });
-    }
-  }
-  setTimeout(() => success(data), 25);
-};
-
-// Empty datasource: no items at all
-const datasourceGetEmpty = (_index, _count, success) => {
-  setTimeout(() => success([]), 25);
-};
-
-type BofEofState = {
-  bufferBof: boolean;
-  bufferEof: boolean;
-  adapterBof: boolean;
-  adapterEof: boolean;
-  sharedBof?: boolean;
-  sharedEof?: boolean;
-  bofCount?: number;
-  eofCount?: number;
-};
-
-type Counter = {
-  count: number;
-  value: boolean;
-  off?: () => void;
-};
-
-type BofEofCountersContainer = {
-  bof: Counter;
-  eof: Counter;
-};
-
-type WithCounters = Window & { __bofEofCounters?: BofEofCountersContainer };
-
-/** Setup bof/eof tracking container in browser context */
-const setupBofEofTracking = async (page: Page) =>
-  page.evaluate(() => {
-    const w = window as WithCounters;
-    const adapter = w.__vscroll__.datasource.adapter;
-    const bof: Counter = {
-      count: 0,
-      value: adapter.bof
-    };
-    const eof: Counter = {
-      count: 0,
-      value: adapter.eof
-    };
-
-    w.__bofEofCounters = { bof, eof };
-
-    adapter.bof$.on((value: boolean) => {
-      bof.count++;
-      bof.value = value;
-    });
-    adapter.eof$.on((value: boolean) => {
-      eof.count++;
-      eof.value = value;
-    });
-  });
-
-// Base configs for BOF and EOF cases
-const bofConfig: IConfig = {
-  datasourceGet: datasourceGetLimited,
-  datasourceSettings: {
-    startIndex: min,
-    bufferSize: 10,
-    padding: 0.5
+  getDatasource,
+  makeTest,
+  Misc,
+  MakeTestConfig,
+  OperationConfig,
+  TestConfig
+} from '../scaffolding';
+
+enum Operation {
+  eof = 'eof',
+  bof = 'bof'
+}
+const min = 1,
+  max = 100,
+  scrollCount = 10;
+
+const config: OperationConfig<Operation> = {
+  [Operation.bof]: {
+    datasource: () => getDatasource({ min, max, delay: 1 }),
+    datasourceSettings: {
+      startIndex: min,
+      bufferSize: 10,
+      padding: 0.5
+    },
+    templateSettings: { viewportHeight: 200 }
   },
-  templateSettings: { viewportHeight: 200, itemHeight: 20 },
-  onBefore: setupBofEofTracking
-};
-
-const eofConfig: IConfig = {
-  datasourceGet: datasourceGetLimited,
-  datasourceSettings: {
-    startIndex: max - 10 + 1,
-    bufferSize: 10,
-    padding: 0.5
-  },
-  templateSettings: { viewportHeight: 200, itemHeight: 20 },
-  onBefore: setupBofEofTracking
+  [Operation.eof]: {
+    datasource: () => getDatasource({ min, max, delay: 1 }),
+    datasourceSettings: {
+      startIndex: max - 10 + 1,
+      bufferSize: 10,
+      padding: 0.5
+    },
+    templateSettings: { viewportHeight: 200 }
+  }
 };
 
-// Config where datasource always returns empty array
-const emptyConfig: IConfig = {
-  datasourceGet: datasourceGetEmpty,
+const emptyConfig: TestConfig = {
+  ...config[Operation.bof],
+  datasource: () => getDatasource({ min: 1, max: 0 }),
   datasourceSettings: {
-    startIndex: min,
-    bufferSize: 10,
-    padding: 0.5
-  },
-  templateSettings: { viewportHeight: 200, itemHeight: 20 },
-  onBefore: setupBofEofTracking
+    ...config[Operation.bof].datasourceSettings
+  }
 };
 
-// Config with explicit min/max indexes to track bof/eof reactive counters
-const multipleScrollsConfig: IConfig = {
-  datasourceGet: datasourceGetLimited,
+const observableCountConfig: TestConfig = {
+  ...config[Operation.bof],
   datasourceSettings: {
-    startIndex: min,
-    bufferSize: 10,
-    padding: 0.5,
+    ...config[Operation.bof].datasourceSettings,
     minIndex: min,
     maxIndex: max
-  },
-  templateSettings: { viewportHeight: 200, itemHeight: 20 },
-  onBefore: setupBofEofTracking
+  }
 };
 
-const getBofEofState = async (fixture: VScrollFixture): Promise<BofEofState> =>
-  fixture.page.evaluate(() => {
-    const w = window as WithCounters;
-    const workflow = w.__vscroll__.workflow;
-    const buffer = workflow.scroller.buffer;
-    const adapter = w.__vscroll__.datasource.adapter;
-    const counters = w.__bofEofCounters;
-
-    return {
-      bufferBof: buffer.bof.get(),
-      bufferEof: buffer.eof.get(),
-      adapterBof: adapter.bof,
-      adapterEof: adapter.eof,
-      sharedBof: counters.bof?.value,
-      sharedEof: counters.eof?.value,
-      bofCount: counters.bof?.count || 0,
-      eofCount: counters.eof?.count || 0
-    };
-  });
-
-/**
- * Expect that BOF/EOF limit is reached for the given direction.
- */
-const expectLimit = async (
-  fixture: VScrollFixture,
-  config: IConfig,
-  direction: DirectionType,
-  noscroll = false
-) => {
-  const forward = direction === Direction.forward;
+interface Subscription {
+  unsubscribe: () => void;
+}
 
-  const elements = await fixture.getElements();
-  const bufferSize = config.datasourceSettings.bufferSize as number;
-
-  expect(elements.length).toBeGreaterThan(bufferSize);
-
-  const forwardPadding =
-    await fixture.scroller.viewport.paddings[Direction.forward].size;
-  const backwardPadding =
-    await fixture.scroller.viewport.paddings[Direction.backward].size;
-
-  if (forward) {
-    expect(forwardPadding).toBe(0);
-    if (!noscroll) {
-      expect(backwardPadding).toBeGreaterThan(0);
+interface BEContainer {
+  count: number;
+  value: boolean;
+  subscription: Subscription;
+}
+
+interface BofEofContainer {
+  eof: BEContainer;
+  bof: BEContainer;
+}
+
+const initializeBofEofContainer = (misc: Misc) => {
+  const { adapter, shared } = misc;
+  const bof: BEContainer = {
+    count: 0,
+    value: adapter.bof,
+    subscription: {
+      unsubscribe: adapter.bof$.on(value => {
+        bof.count++;
+        bof.value = value;
+      })
     }
-  } else {
-    expect(backwardPadding).toBe(0);
-    if (!noscroll) {
-      expect(forwardPadding).toBeGreaterThan(0);
+  };
+  const eof: BEContainer = {
+    count: 0,
+    value: adapter.eof,
+    subscription: {
+      unsubscribe: adapter.eof$.on(value => {
+        eof.count++;
+        eof.value = value;
+      })
     }
-  }
-
-  const targetElement = forward
-    ? (elements[elements.length - 1] as HTMLElement)
-    : (elements[0] as HTMLElement);
-  const targetIndex = await fixture.getElementIndex(targetElement);
-  const expectedIndex = forward ? max : min;
-
-  expect(targetIndex).toBe(expectedIndex);
-
-  const state = await getBofEofState(fixture);
+  };
+  shared.bofEofContainer = { bof, eof } as BofEofContainer;
+};
 
-  // bof/eof flags in buffer, adapter and shared container must be in sync
-  expect(state.bufferBof).toBe(!forward);
-  expect(state.adapterBof).toBe(state.bufferBof);
-  if (typeof state.sharedBof !== 'undefined') {
-    expect(state.sharedBof).toBe(state.bufferBof);
-  }
+const disposeBofEofContainer = (misc: Misc) => {
+  const { bof, eof } = misc.shared.bofEofContainer as BofEofContainer;
+  eof.subscription.unsubscribe();
+  bof.subscription.unsubscribe();
+};
 
-  expect(state.bufferEof).toBe(forward);
-  expect(state.adapterEof).toBe(state.bufferEof);
-  if (typeof state.sharedEof !== 'undefined') {
-    expect(state.sharedEof).toBe(state.bufferEof);
+const expectLimit = (misc: Misc, direction: Direction, noscroll = false) => {
+  const _forward = direction === Direction.forward;
+  misc.expect.viewportFilled();
+  const elements = misc.getElements();
+  expect(
+    misc.padding[_forward ? Direction.forward : Direction.backward].getSize()
+  ).toEqual(0);
+  if (!noscroll) {
+    expect(
+      misc.padding[_forward ? Direction.backward : Direction.forward].getSize()
+    ).toBeGreaterThan(0);
   }
+  expect(
+    misc.checkElementId(
+      elements[_forward ? elements.length - 1 : 0],
+      _forward ? max : min
+    )
+  ).toEqual(true);
+
+  const {
+    adapter,
+    scroller: {
+      buffer: { eof, bof }
+    },
+    shared
+  } = misc;
+  expect(bof.get()).toEqual(!_forward);
+  expect(bof.get()).toEqual(adapter.bof);
+  expect(bof.get()).toEqual(
+    (shared.bofEofContainer as BofEofContainer).bof.value
+  );
+  expect(eof.get()).toEqual(adapter.eof);
+  expect(eof.get()).toEqual(_forward);
+  expect(eof.get()).toEqual(
+    (shared.bofEofContainer as BofEofContainer).eof.value
+  );
 };
 
-const makeLimitTest = (
-  title: string,
-  config: IConfig,
-  testFunc: (fixture: VScrollFixture, config: IConfig) => Promise<void>
-) => {
-  test(title, async ({ page }) => {
-    const fixture = await createFixture({ page, config });
-    await testFunc(fixture, config);
-    await fixture.dispose();
+const _makeTest = (data: MakeTestConfig) =>
+  makeTest({
+    ...data,
+    before: (misc: Misc) => initializeBofEofContainer(misc),
+    after: (misc: Misc) => disposeBofEofContainer(misc)
   });
-};
 
-const runLimitSuite = (kind: 'bof' | 'eof') => {
-  const isEOF = kind === 'eof';
-  const config = isEOF ? eofConfig : bofConfig;
-  const suiteTitle = isEOF ? 'End of file' : 'Begin of file';
-  const limitDirection = isEOF ? Direction.forward : Direction.backward;
-  const oppositeDirection = isEOF ? Direction.backward : Direction.forward;
-
-  test.describe(suiteTitle, () => {
-    makeLimitTest(
-      `should get ${kind} on init`,
-      config,
-      async (fixture, cfg) => {
-        // Initial workflow has already completed in createFixture
-        await expectLimit(fixture, cfg, limitDirection, true);
+const runLimitSuite = (operation = Operation.bof) => {
+  const isEOF = operation === Operation.eof;
+
+  describe((isEOF ? 'End' : 'Begin') + ' of file', () => {
+    const _operation = isEOF ? Operation.bof : Operation.eof;
+    const direction = isEOF ? Direction.forward : Direction.backward;
+    const directionOpposite = isEOF ? Direction.backward : Direction.forward;
+    const doScroll = (misc: Misc) =>
+      isEOF ? misc.scrollMinRelax() : misc.scrollMaxRelax();
+    const doScrollOpposite = (misc: Misc) =>
+      isEOF ? misc.scrollMaxRelax() : misc.scrollMinRelax();
+
+    _makeTest({
+      config: config[operation],
+      title: `should get ${operation} on init`,
+      it: misc => async () => {
+        await misc.relaxNext();
+        expectLimit(misc, direction, true);
       }
-    );
-
-    makeLimitTest(
-      `should reset ${kind} after scroll`,
-      config,
-      async fixture => {
-        const initial = await getBofEofState(fixture);
-        if (isEOF) {
-          expect(initial.bufferEof).toBe(true);
-          expect(initial.adapterEof).toBe(true);
-          expect(initial.sharedEof).toBe(true);
-          expect(initial.bufferBof).toBe(false);
-        } else {
-          expect(initial.bufferBof).toBe(true);
-          expect(initial.bufferEof).toBe(false);
-          expect(initial.adapterEof).toBe(false);
-          expect(initial.sharedEof).toBe(false);
-        }
-
-        // Scroll away from the current limit
-        if (isEOF) {
-          await fixture.scrollMin();
-        } else {
-          await fixture.scrollMax();
-        }
+    });
 
-        const after = await getBofEofState(fixture);
-        expect(after.bufferBof).toBe(false);
-        expect(after.adapterBof).toBe(false);
-        expect(after.sharedBof).toBe(false);
-        expect(after.bufferEof).toBe(false);
-        expect(after.adapterEof).toBe(false);
-        expect(after.sharedEof).toBe(false);
+    _makeTest({
+      config: config[operation],
+      title: `should reset ${operation} after scroll`,
+      it: misc => async () => {
+        const {
+          scroller: { buffer },
+          adapter
+        } = misc;
+        const bofEofContainer = misc.shared.bofEofContainer as BofEofContainer;
+
+        await misc.relaxNext();
+        expect(buffer[operation].get()).toEqual(true);
+        expect(adapter[operation]).toEqual(true);
+        expect(bofEofContainer[operation].value).toEqual(true);
+
+        await doScroll(misc);
+        expect(buffer[operation].get()).toEqual(false);
+        expect(adapter[operation]).toEqual(false);
+        expect(bofEofContainer[operation].value).toEqual(false);
+        expect(buffer[_operation].get()).toEqual(false);
+        expect(adapter[_operation]).toEqual(false);
+        expect(bofEofContainer[_operation].value).toEqual(false);
       }
-    );
-
-    makeLimitTest(
-      `should stop when ${kind} is reached again`,
-      config,
-      async (fixture, cfg) => {
-        // Move to the opposite limit and then back
-        if (isEOF) {
-          await fixture.scrollMin();
-          await fixture.scrollMax();
-        } else {
-          await fixture.scrollMax();
-          await fixture.scrollMin();
-        }
+    });
 
-        await expectLimit(fixture, cfg, limitDirection);
+    _makeTest({
+      config: config[operation],
+      title: `should stop when ${operation} is reached again`,
+      it: misc => async () => {
+        await misc.relaxNext();
+        await doScroll(misc);
+        await doScrollOpposite(misc);
+        expectLimit(misc, direction);
       }
-    );
+    });
 
-    makeLimitTest(
-      `should reach ${isEOF ? 'bof' : 'eof'} after some scrolls`,
-      config,
-      async (fixture, cfg) => {
-        // From current limit, repeated scrolls must eventually reach the opposite limit
-        for (let i = 0; i < scrollCount; i++) {
-          if (isEOF) {
-            await fixture.scrollMin();
-          } else {
-            await fixture.scrollMax();
-          }
+    _makeTest({
+      config: config[operation],
+      title: `should reach ${_operation} after some scrolls`,
+      it: misc => async () => {
+        await misc.relaxNext();
+        while (misc.workflow.cyclesDone < scrollCount) {
+          await doScroll(misc);
         }
-
-        await expectLimit(fixture, cfg, oppositeDirection);
+        expectLimit(misc, directionOpposite);
       }
-    );
+    });
   });
 };
 
-test.describe('EOF/BOF Spec', () => {
-  runLimitSuite('bof');
-  runLimitSuite('eof');
-
-  test.describe('Empty datasource', () => {
-    test('should reach both bof and eof during the first workflow cycle', async ({
-      page
-    }) => {
-      const fixture = await createFixture({ page, config: emptyConfig });
-
-      const state = await getBofEofState(fixture);
-      expect(state.bufferBof).toBe(true);
-      expect(state.bufferEof).toBe(true);
-      expect(state.adapterBof).toBe(true);
-      expect(state.adapterEof).toBe(true);
-      expect(state.sharedBof).toBe(true);
-      expect(state.sharedEof).toBe(true);
-      expect(state.bofCount).toBe(1);
-      expect(state.eofCount).toBe(1);
-
-      await fixture.dispose();
-    });
+describe('EOF/BOF Spec', () => {
+  runLimitSuite(Operation.bof);
+  runLimitSuite(Operation.eof);
+
+  _makeTest({
+    config: emptyConfig,
+    title: 'should reach both bof and eof during the first WF cycle',
+    it: misc => async () => {
+      await misc.relaxNext();
+      const { bof, eof } = misc.shared.bofEofContainer as BofEofContainer;
+      expect(bof.count).toEqual(1);
+      expect(eof.count).toEqual(1);
+      expect(bof.value).toEqual(true);
+      expect(eof.value).toEqual(true);
+    }
   });
 
-  test.describe('Multiple scrolls', () => {
-    test('should reach bof/eof multiple times', async ({ page }) => {
-      const fixture = await createFixture({
-        page,
-        config: multipleScrollsConfig
-      });
-
-      // Perform a sequence of scrolls:
-      // max, min, max, min, ... to toggle bof/eof repeatedly
+  _makeTest({
+    config: observableCountConfig,
+    title: 'should reach bof/eof multiple times',
+    it: misc => async () => {
       const COUNT = 10;
-      for (let i = 1; i <= COUNT; i++) {
-        const cyclesDone = await fixture.workflow.cyclesDone;
-        if (cyclesDone === 1) {
-          await fixture.scrollMax();
-        } else if (cyclesDone > 1 && cyclesDone < COUNT) {
-          if (cyclesDone % 2 === 0) {
-            await fixture.scrollMin();
-          } else {
-            await fixture.scrollMax();
-          }
+      await misc.relaxNext();
+
+      while (misc.workflow.cyclesDone < COUNT) {
+        if (misc.workflow.cyclesDone % 2 === 0) {
+          await misc.scrollMinRelax();
         } else {
-          break;
+          await misc.scrollMaxRelax();
         }
       }
 
-      const state = await getBofEofState(fixture);
-      expect(state.bofCount || 0).toEqual(COUNT);
-      expect(state.eofCount || 0).toEqual(COUNT - 1);
-
-      await fixture.dispose();
-    });
+      const { bof, eof } = misc.shared.bofEofContainer as BofEofContainer;
+      expect(bof.count).toEqual(COUNT);
+      expect(eof.count).toEqual(COUNT - 1);
+    }
   });
 });
diff --git a/tests/e2e/specs/initial-load.spec.ts b/tests/e2e/specs/initial-load.spec.ts
index a3504d3c..e66bc713 100644
--- a/tests/e2e/specs/initial-load.spec.ts
+++ b/tests/e2e/specs/initial-load.spec.ts
@@ -1,61 +1,45 @@
-import { test, expect } from '@playwright/test';
-import { VScrollFixture, Direction } from '../fixture/VScrollFixture.js';
-import { afterEachLogs } from '../fixture/after-each-logs.js';
-import { createFixture } from '../fixture/create-fixture.js';
-import { ITestConfig } from 'types/index.js';
-import { ItemsCounter } from '../helpers/itemsCounter.js';
+import { makeTest, Misc, TestConfig } from '../scaffolding';
 
-test.afterEach(afterEachLogs);
+type InitialLoadConfig = TestConfig & {
+  datasourceSettings: NonNullable<TestConfig['datasourceSettings']>;
+  templateSettings: NonNullable<TestConfig['templateSettings']>;
+};
 
-// Basic unlimited datasource for all tests
-const unlimitedDatasource = (index, count, success) => {
-  const data = [];
-  for (let i = index; i < index + count; i++) {
-    data.push({ id: i, text: `item #${i}` });
-  }
-  setTimeout(() => success(data), 25);
+type GoldenConfig = InitialLoadConfig & {
+  golden: [number, number];
 };
 
-const fixedItemSizeConfigList: ITestConfig[] = [
+type Scenario<Config extends InitialLoadConfig = InitialLoadConfig> = (
+  config: Config
+) => (misc: Misc) => () => Promise<void>;
+
+const fixedItemSizeConfigList: GoldenConfig[] = [
   {
-    datasourceGet: unlimitedDatasource,
-    datasourceSettings: {
-      startIndex: 1,
-      padding: 2,
-      itemSize: 15
-    },
-    templateSettings: { viewportHeight: 20, itemHeight: 15 }
+    datasourceSettings: { startIndex: 1, padding: 2, itemSize: 15 },
+    templateSettings: { viewportHeight: 20, itemHeight: 15 },
+    golden: [-4, 5]
   },
   {
-    datasourceGet: unlimitedDatasource,
-    datasourceSettings: {
-      startIndex: 1,
-      padding: 0.5,
-      itemSize: 20
-    },
-    templateSettings: { viewportHeight: 120, itemHeight: 20 }
+    datasourceSettings: { startIndex: 1, padding: 0.5, itemSize: 20 },
+    templateSettings: { viewportHeight: 120, itemHeight: 20 },
+    golden: [-4, 9]
   },
   {
-    datasourceGet: unlimitedDatasource,
-    datasourceSettings: {
-      startIndex: -99,
-      padding: 0.3,
-      itemSize: 25
-    },
-    templateSettings: { viewportHeight: 200, itemHeight: 25 }
+    datasourceSettings: { startIndex: -99, padding: 0.3, itemSize: 25 },
+    templateSettings: { viewportHeight: 200, itemHeight: 25 },
+    golden: [-104, -89]
   },
   {
-    datasourceGet: unlimitedDatasource,
     datasourceSettings: {
       startIndex: -77,
       padding: 0.62,
       itemSize: 100,
       horizontal: true
     },
-    templateSettings: { viewportWidth: 450, itemWidth: 100, horizontal: true }
+    templateSettings: { viewportWidth: 450, itemWidth: 100, horizontal: true },
+    golden: [-82, -70]
   },
   {
-    datasourceGet: unlimitedDatasource,
     datasourceSettings: {
       startIndex: 1,
       padding: 0.5,
@@ -66,23 +50,23 @@ const fixedItemSizeConfigList: ITestConfig[] = [
       noViewportClass: true,
       viewportHeight: 0,
       itemHeight: 20
-    }
+    },
+    golden: [-19, 58]
   }
 ];
 
-const fixedItemSizeAndBigBufferSizeConfigList: ITestConfig[] = [
+const fixedItemSizeAndBigBufferSizeConfigList: GoldenConfig[] = [
   {
-    datasourceGet: unlimitedDatasource,
     datasourceSettings: {
       startIndex: 100,
       padding: 0.1,
       itemSize: 20,
       bufferSize: 20
     },
-    templateSettings: { viewportHeight: 100, itemHeight: 20 }
+    templateSettings: { viewportHeight: 100, itemHeight: 20 },
+    golden: [80, 119]
   },
   {
-    datasourceGet: unlimitedDatasource,
     datasourceSettings: {
       startIndex: -50,
       padding: 0.1,
@@ -90,75 +74,70 @@ const fixedItemSizeAndBigBufferSizeConfigList: ITestConfig[] = [
       bufferSize: 10,
       horizontal: true
     },
-    templateSettings: { viewportWidth: 200, itemWidth: 100, horizontal: true }
+    templateSettings: { viewportWidth: 200, itemWidth: 100, horizontal: true },
+    golden: [-60, -41]
   }
 ];
 
-const tunedItemSizeConfigList: ITestConfig[] = [
+const tunedItemSizeConfigList: GoldenConfig[] = [
   {
-    datasourceGet: unlimitedDatasource,
     datasourceSettings: {
       startIndex: 1,
       bufferSize: 1,
       padding: 0.5,
       itemSize: 40
     },
-    noRelaxOnStart: true,
-    templateSettings: { viewportHeight: 100, itemHeight: 20 }
+    templateSettings: { viewportHeight: 100, itemHeight: 20 },
+    golden: [-2, 8]
   },
   {
-    datasourceGet: unlimitedDatasource,
     datasourceSettings: {
       startIndex: -50,
       bufferSize: 2,
       padding: 0.5,
       itemSize: 30
     },
-    noRelaxOnStart: true,
-    templateSettings: { viewportHeight: 120, itemHeight: 20 }
+    templateSettings: { viewportHeight: 120, itemHeight: 20 },
+    golden: [-53, -42]
   },
   {
-    datasourceGet: unlimitedDatasource,
     datasourceSettings: {
       startIndex: -77,
       padding: 0.82,
       itemSize: 200,
       horizontal: true
     },
-    noRelaxOnStart: true,
-    templateSettings: { viewportWidth: 450, itemWidth: 100, horizontal: true }
+    templateSettings: { viewportWidth: 450, itemWidth: 100, horizontal: true },
+    golden: [-82, -68]
   },
   {
-    datasourceGet: unlimitedDatasource,
     datasourceSettings: {
       startIndex: -47,
       padding: 0.3,
       itemSize: 60,
       windowViewport: true
     },
-    noRelaxOnStart: true,
     templateSettings: {
       noViewportClass: true,
       viewportHeight: 0,
       itemHeight: 40
-    }
+    },
+    golden: [-53, -23]
   }
 ];
 
-const tunedItemSizeAndBigBufferSizeConfigList: ITestConfig[] = [
+const tunedItemSizeAndBigBufferSizeConfigList: GoldenConfig[] = [
   {
-    datasourceGet: unlimitedDatasource,
     datasourceSettings: {
       startIndex: -50,
       bufferSize: 7,
       padding: 0.5,
       itemSize: 30
     },
-    noRelaxOnStart: true,
-    templateSettings: { viewportHeight: 120, itemHeight: 20 }
+    templateSettings: { viewportHeight: 120, itemHeight: 20 },
+    golden: [-57, -37]
   },
   {
-    datasourceGet: unlimitedDatasource,
     datasourceSettings: {
       startIndex: 50,
       padding: 0.33,
@@ -166,89 +145,45 @@ const tunedItemSizeAndBigBufferSizeConfigList: ITestConfig[] = [
       bufferSize: 20,
       windowViewport: true
     },
-    noRelaxOnStart: true,
     templateSettings: {
       noViewportClass: true,
       viewportHeight: 0,
       itemHeight: 20
-    }
+    },
+    golden: [30, 101]
   }
 ];
 
-const noItemSizeConfigList: ITestConfig[] = tunedItemSizeConfigList.map(
-  ({
-    datasourceGet,
-    datasourceSettings: { itemSize: _, ...restDatasourceSettings },
-    ...config
-  }) => ({
-    ...config,
-    datasourceGet,
-    datasourceSettings: { ...restDatasourceSettings }
-  })
-);
+const withoutItemSize = (config: GoldenConfig): GoldenConfig => {
+  const datasourceSettings = { ...config.datasourceSettings };
+  delete datasourceSettings.itemSize;
+  return { ...config, datasourceSettings };
+};
 
-const noItemSizeAndBigBufferConfigList: ITestConfig[] =
-  tunedItemSizeAndBigBufferSizeConfigList.map(
-    ({
-      datasourceGet,
-      datasourceSettings: { itemSize: _, ...restDatasourceSettings },
-      ...config
-    }) => ({
-      ...config,
-      datasourceGet,
-      datasourceSettings: { ...restDatasourceSettings }
-    })
-  );
+const noItemSizeConfigList = tunedItemSizeConfigList.map(withoutItemSize);
+const noItemSizeAndBigBufferConfigList =
+  tunedItemSizeAndBigBufferSizeConfigList.map(withoutItemSize);
 
-const lackOfItemsOnFirstFetchConfigList: ITestConfig[] = [
+const lackOfItemsOnFirstFetchConfigList: InitialLoadConfig[] = [
   {
-    datasourceGet: (index, count, success) => {
-      const data = [];
-      for (let i = index; i < index + count; i++) {
-        if (i >= 1) {
-          data.push({ id: i, text: `item #${i}` });
-        }
-      }
-      setTimeout(() => success(data), 25);
-    },
     datasourceSettings: {
       startIndex: 100,
       padding: 0.5,
       bufferSize: 10,
       minIndex: 1
     },
-    noRelaxOnStart: true,
     templateSettings: { viewportHeight: 300, itemHeight: 20 }
   },
   {
-    datasourceGet: (index, count, success) => {
-      const data = [];
-      for (let i = index; i < index + count; i++) {
-        if (i >= -75) {
-          data.push({ id: i, text: `item #${i}` });
-        }
-      }
-      setTimeout(() => success(data), 25);
-    },
     datasourceSettings: {
       startIndex: -70,
       padding: 0.5,
       bufferSize: 2,
       minIndex: -75
     },
-    noRelaxOnStart: true,
     templateSettings: { viewportHeight: 200, itemHeight: 20 }
   },
   {
-    datasourceGet: (index, count, success) => {
-      const data = [];
-      for (let i = index; i < index + count; i++) {
-        if (i >= -9) {
-          data.push({ id: i, text: `item #${i}` });
-        }
-      }
-      setTimeout(() => success(data), 25);
-    },
     datasourceSettings: {
       startIndex: 1,
       padding: 0.1,
@@ -256,7 +191,6 @@ const lackOfItemsOnFirstFetchConfigList: ITestConfig[] = [
       minIndex: -9,
       windowViewport: true
     },
-    noRelaxOnStart: true,
     templateSettings: {
       noViewportClass: true,
       viewportHeight: 0,
@@ -264,15 +198,6 @@ const lackOfItemsOnFirstFetchConfigList: ITestConfig[] = [
     }
   },
   {
-    datasourceGet: (index, count, success) => {
-      const data = [];
-      for (let i = index; i < index + count; i++) {
-        if (i >= -120) {
-          data.push({ id: i, text: `item #${i}` });
-        }
-      }
-      setTimeout(() => success(data), 25);
-    },
     datasourceSettings: {
       startIndex: -99,
       padding: 0.3,
@@ -280,413 +205,130 @@ const lackOfItemsOnFirstFetchConfigList: ITestConfig[] = [
       minIndex: -120,
       horizontal: true
     },
-    noRelaxOnStart: true,
     templateSettings: { horizontal: true, viewportWidth: 300, itemWidth: 40 }
   }
 ];
 
-const getSetItemSizeCounter = async (
-  config: ITestConfig,
-  fixture: VScrollFixture,
-  itemSize: number
-): Promise<ItemsCounter> => {
-  const bufferSize = await fixture.scroller.settings.bufferSize;
-  const startIndex = config.datasourceSettings.startIndex as number;
-  const padding = config.datasourceSettings.padding as number;
-  const viewportSize = await fixture.scroller.viewport.getSize();
-
-  const backwardLimit = viewportSize * padding;
-  const forwardLimit = viewportSize + backwardLimit;
-  const itemsCounter = new ItemsCounter();
-
-  itemsCounter.backward.count = Math.ceil(backwardLimit / itemSize);
-  itemsCounter.forward.count = Math.ceil(forwardLimit / itemSize);
-
-  // when bufferSize is big enough
-  const bwdDiff = bufferSize - itemsCounter.backward.count;
-  if (bwdDiff > 0) {
-    itemsCounter.backward.count += bwdDiff;
-  }
-  const fwdDiff = bufferSize - itemsCounter.forward.count;
-  if (fwdDiff > 0) {
-    itemsCounter.forward.count += fwdDiff;
-  }
-
-  itemsCounter.backward.index = startIndex - itemsCounter.backward.count;
-  itemsCounter.forward.index = startIndex + itemsCounter.forward.count - 1;
-  return itemsCounter;
-};
-
-const getNotSetItemSizeCounter = async (
-  config: ITestConfig,
-  fixture: VScrollFixture,
-  itemSize: number,
-  previous?: ItemsCounter
-): Promise<ItemsCounter> => {
-  const bufferSize = await fixture.scroller.settings.bufferSize;
-  const startIndex = config.datasourceSettings.startIndex as number;
-  const padding = config.datasourceSettings.padding as number;
-  const viewportSize = await fixture.scroller.viewport.getSize();
-  const backwardLimit = viewportSize * padding;
-  const forwardLimit = viewportSize + backwardLimit;
-  const itemsCounter = new ItemsCounter();
-  const countB = previous ? previous.backward.count : 0;
-  const countF = previous ? previous.forward.count : 0;
-  let bwd, fwd;
-
-  // 1) fetch only in forward direction if this is the first fetch
-  // 2) fetch bufferSize items if Settings.itemSize value hasn't been set up
-  itemsCounter.backward.count = previous
-    ? itemSize
-      ? Math.ceil(backwardLimit / itemSize)
-      : bufferSize
-    : 0;
-  itemsCounter.forward.count = itemSize
-    ? Math.ceil(forwardLimit / itemSize)
-    : bufferSize;
-  if (previous) {
-    itemsCounter.backward.count = Math.max(itemsCounter.backward.count, countB);
-    itemsCounter.forward.count = Math.max(itemsCounter.forward.count, countF);
-  }
-
-  // when bufferSize is big enough
-  bwd = itemsCounter.backward.count - (previous ? countB : 0);
-  fwd = itemsCounter.forward.count - (previous ? countF : 0);
-  const bwdDiff = bwd > 0 ? bufferSize - bwd : 0;
-  const fwdDiff = fwd > 0 ? bufferSize - fwd : 0;
-  if (bwdDiff > 0 && bwd > fwd) {
-    itemsCounter.backward.count += bwdDiff;
-    itemsCounter.forward.count = previous ? countF : itemsCounter.forward.count;
-  }
-  if (fwdDiff > 0 && fwd >= bwd) {
-    itemsCounter.forward.count += fwdDiff;
-    itemsCounter.backward.count = previous
-      ? countB
-      : itemsCounter.backward.count;
-  }
-
-  if (previous) {
-    bwd = itemsCounter.backward.count - countB;
-    fwd = itemsCounter.forward.count - countF;
-    if (bwd > 0 && bwd > fwd) {
-      itemsCounter.backward.count = countB + bwd;
-      itemsCounter.forward.count =
-        fwd > 0 ? countF : itemsCounter.forward.count;
-    }
-    if (fwd > 0 && fwd >= bwd) {
-      itemsCounter.forward.count = countF + fwd;
-      itemsCounter.backward.count =
-        bwd > 0 ? countB : itemsCounter.backward.count;
-    }
-  }
-
-  itemsCounter.backward.index = startIndex - itemsCounter.backward.count;
-  itemsCounter.forward.index = startIndex + itemsCounter.forward.count - 1;
-
-  const defaultSize = await fixture.scroller.buffer.defaultSize;
-  itemsCounter.backward.padding = 0;
-  itemsCounter.forward.padding = Math.max(
-    0,
-    viewportSize - itemsCounter.forward.count * defaultSize
-  );
-
-  return itemsCounter;
-};
-
-const testItemsCounter = async (
-  startIndex: number,
-  fixture: VScrollFixture,
-  itemsCounter: ItemsCounter
-) => {
-  const elements = await fixture.getElements();
-  const firstIndex = await fixture.getElementIndex(elements[0] as HTMLElement);
-  const lastIndex = await fixture.getElementIndex(
-    elements[elements.length - 1] as HTMLElement
-  );
-
-  expect(firstIndex).toEqual(itemsCounter.backward.index);
-  expect(lastIndex).toEqual(itemsCounter.forward.index);
-  expect(
-    await fixture.scroller.viewport.paddings[Direction.backward].size
-  ).toEqual(itemsCounter.backward.padding);
-  expect(
-    await fixture.scroller.viewport.paddings[Direction.forward].size
-  ).toEqual(itemsCounter.forward.padding);
-
-  const bufferInfo = await fixture.adapter.bufferInfo;
-  expect(bufferInfo.firstIndex).toEqual(itemsCounter.backward.index);
-  expect(bufferInfo.lastIndex).toEqual(itemsCounter.forward.index);
-
-  const firstVisible = await fixture.adapter.firstVisible;
-  expect(firstVisible.$index).toEqual(startIndex);
-};
-
-const testSetItemSizeCase = async (
-  fixture: VScrollFixture,
-  config: ITestConfig
-) => {
-  // Wait for the workflow to complete
-  await fixture.adapter.relax();
-
-  const cyclesDone = await fixture.workflow.cyclesDone;
-  const fetchCount = await fixture.page.evaluate(
-    () => window.__vscroll__.workflow.scroller.state.fetch.callCount
-  );
-  const innerLoopCount = await fixture.workflow.innerLoopCount;
-  const clipCount = await fixture.page.evaluate(
-    () => window.__vscroll__.workflow.scroller.state.clip.callCount
-  );
-
-  expect(cyclesDone).toEqual(1);
-  expect(fetchCount).toEqual(2);
-  expect(innerLoopCount).toEqual(3);
-  expect(clipCount).toEqual(0);
-  expect(
-    await fixture.scroller.viewport.paddings[Direction.backward].size
-  ).toEqual(0);
-  expect(
-    await fixture.scroller.viewport.paddings[Direction.forward].size
-  ).toEqual(0);
-
-  const startIndex = config.datasourceSettings.startIndex as number;
-  const tplSettings = config.templateSettings || {};
-  const horizontal = config.datasourceSettings.horizontal;
-  const itemSize = tplSettings[
-    horizontal ? 'itemWidth' : 'itemHeight'
-  ] as number;
-  const itemsCounter = await getSetItemSizeCounter(config, fixture, itemSize);
-  await testItemsCounter(startIndex, fixture, itemsCounter);
-};
-
-type LoopData = {
-  loopCount: number;
-  viewportSize: number;
-  defaultSize: number;
-  bufferSize: number;
-  firstIndex: number;
-  lastIndex: number;
-  bwdPaddingSize: number;
-  fwdPaddingSize: number;
-  elementsLength: number;
-  firstElementIndex: number;
-  lastElementIndex: number;
-  bufferItemsLength: number;
-  bufferFirstIndex: number;
-  bufferLastIndex: number;
-  firstVisibleIndex: number;
-};
-
-const testNotSetItemSizeCase = async (
-  fixture: VScrollFixture,
-  config: ITestConfig
-) => {
-  const startIndex = config.datasourceSettings.startIndex as number;
-  const initialItemSize = config.datasourceSettings.itemSize as number;
-  const tplSettings = config.templateSettings || {};
-  const horizontal = config.datasourceSettings.horizontal;
-  const itemSize = tplSettings[
-    horizontal ? 'itemWidth' : 'itemHeight'
-  ] as number;
-
-  // Capture data from all loops in browser context
-  const loopData = await fixture.page.evaluate(() => {
-    return new Promise<{ loops: LoopData[] }>(resolve => {
-      const workflow = window.__vscroll__.workflow;
-      const innerLoop = workflow.scroller.state.cycle.innerLoop;
-      const loops: LoopData[] = [];
-
-      innerLoop.busy.on(loopPending => {
-        if (loopPending) {
-          return;
-        }
-
-        const loopCount = innerLoop.total;
-
-        // On loops 1, 2, 3: memorize complete state
-        if (loopCount >= 1 && loopCount <= 3) {
-          const buffer = workflow.scroller.buffer;
-          loops.push({
-            loopCount: loopCount,
-            viewportSize: workflow.scroller.viewport.getScrollableSize(),
-            defaultSize: buffer.defaultSize,
-            bufferSize: buffer.size,
-            firstIndex: buffer.firstIndex,
-            lastIndex: buffer.lastIndex,
-            bwdPaddingSize: workflow.scroller.viewport.paddings.backward.size,
-            fwdPaddingSize: workflow.scroller.viewport.paddings.forward.size,
-            elementsLength: buffer.items.length,
-            firstElementIndex: buffer.items[0].$index,
-            lastElementIndex: buffer.items[buffer.items.length - 1].$index,
-            bufferItemsLength: buffer.items.length,
-            bufferFirstIndex: workflow.scroller.adapter.bufferInfo.firstIndex,
-            bufferLastIndex: workflow.scroller.adapter.bufferInfo.lastIndex,
-            firstVisibleIndex: workflow.scroller.adapter.firstVisible.$index
-          });
-        }
-
-        // On loop 4: resolve with all collected data
-        if (loopCount === 4) {
-          resolve({ loops });
-          return;
-        }
-      });
+const testFixedItemSize: Scenario<GoldenConfig> =
+  config => misc => async () => {
+    await misc.relaxNext();
+
+    const { fetch, clip } = misc.scroller.state;
+    expect(misc.workflow.cyclesDone).toEqual(1);
+    expect(fetch.callCount).toEqual(2);
+    expect(misc.innerLoopCount).toEqual(3);
+    expect(clip.callCount).toEqual(0);
+
+    misc.expect.consistent();
+    misc.expect.bufferRange(config.golden);
+    misc.expect.startVisible(config.datasourceSettings.startIndex as number);
+    expect(misc.padding.backward.getSize()).toEqual(0);
+    expect(misc.padding.forward.getSize()).toEqual(0);
+  };
+
+const testMeasuredItemSize: Scenario<GoldenConfig> =
+  config => misc => async () => {
+    const cycleDone = misc.waitNextCycle();
+    const innerLoops = await misc.captureInnerLoops(3, () => ({
+      indexes: misc.scroller.buffer.items.map(item => item.$index),
+      firstIndex: misc.adapter.bufferInfo.firstIndex,
+      lastIndex: misc.adapter.bufferInfo.lastIndex
+    }));
+    await cycleDone;
+    await misc.adapter.relax();
+
+    expect(misc.workflow.cyclesDone).toEqual(1);
+    expect(misc.scroller.state.fetch.callCount).toEqual(3);
+    expect(misc.scroller.state.clip.callCount).toEqual(0);
+
+    innerLoops.forEach(({ indexes, firstIndex, lastIndex }) => {
+      const contiguous = Array.from(
+        { length: lastIndex - firstIndex + 1 },
+        (_, offset) => firstIndex + offset
+      );
+      expect(indexes).toEqual(contiguous);
     });
-  });
-
-  // Wait for scroller to stop completely
-  await fixture.adapter.relax();
 
-  // Check final state in node context
-  const cyclesDone = await fixture.workflow.cyclesDone;
-  const { fetchCount, clipCount } = await fixture.page.evaluate(() => ({
-    fetchCount: window.__vscroll__.workflow.scroller.state.fetch.callCount,
-    clipCount: window.__vscroll__.workflow.scroller.state.clip.callCount
+    misc.expect.consistent();
+    misc.expect.bufferRange(config.golden);
+    misc.expect.startVisible(config.datasourceSettings.startIndex as number);
+    expect(misc.padding.backward.getSize()).toEqual(0);
+    expect(misc.padding.forward.getSize()).toEqual(0);
+  };
+
+const testFirstFetchGap: Scenario = config => misc => async () => {
+  const cycleDone = misc.waitNextCycle();
+  const [firstLoop] = await misc.captureInnerLoops(1, () => ({
+    scrollPosition: misc.getScrollPosition(),
+    backwardPadding: misc.padding.backward.getSize(),
+    firstVisibleIndex: misc.adapter.firstVisible.$index
   }));
-  expect(cyclesDone).toEqual(1);
-  expect(fetchCount).toEqual(3);
-  expect(clipCount).toEqual(0);
 
-  // Validate each loop's itemsCounter against captured snapshots
-  let previousCounter: ItemsCounter | undefined;
-
-  for (const loop of loopData.loops) {
-    const sizeToUse = loop.loopCount === 1 ? initialItemSize : itemSize;
-    const itemsCounter = await getNotSetItemSizeCounter(
-      config,
-      fixture,
-      sizeToUse,
-      previousCounter
-    );
-
-    // Replicate all checks from original testItemsCounter using captured data
-    expect(loop.bwdPaddingSize).toEqual(itemsCounter.backward.padding);
-    expect(loop.fwdPaddingSize).toEqual(itemsCounter.forward.padding);
-    expect(loop.elementsLength).toEqual(itemsCounter.total);
-    expect(loop.bufferItemsLength).toEqual(itemsCounter.total);
-    expect(loop.firstElementIndex).toEqual(itemsCounter.backward.index);
-    expect(loop.lastElementIndex).toEqual(itemsCounter.forward.index);
-    expect(loop.bufferFirstIndex).toEqual(itemsCounter.backward.index);
-    expect(loop.bufferLastIndex).toEqual(itemsCounter.forward.index);
-    expect(loop.firstVisibleIndex).toEqual(startIndex);
-
-    previousCounter = itemsCounter;
-  }
-};
-
-const testLackOfItemsOnFirstFetchCase = async (
-  fixture: VScrollFixture,
-  config: ITestConfig
-) => {
   const startIndex = config.datasourceSettings.startIndex as number;
+  expect(firstLoop.scrollPosition).toBe(firstLoop.backwardPadding);
+  expect(firstLoop.firstVisibleIndex).toEqual(startIndex);
 
-  // Capture state after the first inner loop completes
-  const result = await fixture.page.evaluate(() => {
-    return new Promise<{
-      scrollPosition: number;
-      bwdPaddingSize: number;
-      firstVisibleIndex: number;
-    }>(resolve => {
-      const workflow = window.__vscroll__.workflow;
-      const innerLoop = workflow.scroller.state.cycle.innerLoop;
-      let resolved = false;
-
-      innerLoop.busy.on((loopPending: boolean) => {
-        if (!loopPending && !resolved) {
-          // First inner loop just completed
-          resolved = true;
-          const viewport = workflow.scroller.viewport;
-          resolve({
-            scrollPosition: viewport.scrollPosition,
-            bwdPaddingSize: viewport.paddings.backward.size,
-            firstVisibleIndex: workflow.scroller.adapter.firstVisible.$index
-          });
-        }
-      });
-    });
-  });
-
-  // Start workflow and wait for it to complete
-  await fixture.adapter.relax();
-
-  // Verify state after first inner loop
-  expect(result.scrollPosition).toBe(result.bwdPaddingSize);
-  expect(result.firstVisibleIndex).toEqual(startIndex);
+  await cycleDone;
+  await misc.adapter.relax();
 
-  // Verify final state
-  const finalFirstVisibleIndex = (await fixture.adapter.firstVisible).$index;
-  expect(finalFirstVisibleIndex).toEqual(startIndex);
+  misc.expect.consistent();
+  misc.expect.startVisible(startIndex);
 };
 
-const makeTest = (
+const registerCases = <Config extends InitialLoadConfig>(
+  configs: Config[],
   title: string,
-  config: ITestConfig,
-  testFunc: (fixture: VScrollFixture, config: ITestConfig) => Promise<void>
-) => {
-  test(title, async ({ page }) => {
-    const fixture = await createFixture({ page, config });
-    await testFunc(fixture, config);
-    await fixture.dispose();
-  });
-};
-
-test.describe('Initial Load Spec', () => {
-  test.describe('Fixed itemSize', () => {
-    fixedItemSizeConfigList.forEach((config, i) =>
-      makeTest(
-        `should make 2 fetches to satisfy padding limits (config ${i})`,
-        config,
-        testSetItemSizeCase
-      )
+  scenario: Scenario<Config>
+) =>
+  configs.forEach(config => makeTest({ config, title, it: scenario(config) }));
+
+describe('Initial Load Spec', () => {
+  describe('Fixed itemSize', () => {
+    registerCases(
+      fixedItemSizeConfigList,
+      'should make 2 fetches to satisfy padding limits',
+      testFixedItemSize
     );
-    fixedItemSizeAndBigBufferSizeConfigList.forEach((config, i) =>
-      makeTest(
-        `should make 2 fetches to overflow padding limits (bufferSize is big enough) (config ${i})`,
-        config,
-        testSetItemSizeCase
-      )
+    registerCases(
+      fixedItemSizeAndBigBufferSizeConfigList,
+      'should make 2 fetches to overflow padding limits (bufferSize is big enough)',
+      testFixedItemSize
     );
   });
 
-  test.describe('Tuned itemSize', () => {
-    tunedItemSizeConfigList.forEach((config, i) =>
-      makeTest(
-        `should make 3 fetches to satisfy padding limits (config ${i})`,
-        config,
-        testNotSetItemSizeCase
-      )
+  describe('Tuned itemSize', () => {
+    registerCases(
+      tunedItemSizeConfigList,
+      'should make 3 fetches to satisfy padding limits',
+      testMeasuredItemSize
     );
-    tunedItemSizeAndBigBufferSizeConfigList.forEach((config, i) =>
-      makeTest(
-        `should make 3 fetches to overflow padding limits (bufferSize is big enough) (config ${i})`,
-        config,
-        testNotSetItemSizeCase
-      )
+    registerCases(
+      tunedItemSizeAndBigBufferSizeConfigList,
+      'should make 3 fetches to overflow padding limits (bufferSize is big enough)',
+      testMeasuredItemSize
     );
   });
 
-  test.describe('No itemSize', () => {
-    noItemSizeConfigList.forEach((config, i) =>
-      makeTest(
-        `should make 3 fetches to satisfy padding limits (config ${i})`,
-        config,
-        testNotSetItemSizeCase
-      )
+  describe('No itemSize', () => {
+    registerCases(
+      noItemSizeConfigList,
+      'should make 3 fetches to satisfy padding limits',
+      testMeasuredItemSize
     );
-    noItemSizeAndBigBufferConfigList.forEach((config, i) =>
-      makeTest(
-        `should make 3 fetches to overflow padding limits (bufferSize is big enough) (config ${i})`,
-        config,
-        testNotSetItemSizeCase
-      )
+    registerCases(
+      noItemSizeAndBigBufferConfigList,
+      'should make 3 fetches to overflow padding limits (bufferSize is big enough)',
+      testMeasuredItemSize
     );
   });
 
-  test.describe('Lack of items after the 1st fetch', () =>
-    lackOfItemsOnFirstFetchConfigList.forEach((config, i) =>
-      makeTest(
-        `should stretch the forward padding element (${i})`,
+  describe('Lack of items after the 1st fetch', () => {
+    lackOfItemsOnFirstFetchConfigList.forEach((config, index) =>
+      makeTest({
         config,
-        testLackOfItemsOnFirstFetchCase
-      )
-    ));
+        title: `should stretch the forward padding element (${index})`,
+        it: testFirstFetchGap(config)
+      })
+    );
+  });
 });
diff --git a/tests/e2e/specs/min-max-indexes.spec.ts b/tests/e2e/specs/min-max-indexes.spec.ts
index fba6fc1a..ce47715a 100644
--- a/tests/e2e/specs/min-max-indexes.spec.ts
+++ b/tests/e2e/specs/min-max-indexes.spec.ts
@@ -1,22 +1,25 @@
-import { test, expect } from '@playwright/test';
-import { VScrollFixture, Direction } from '../fixture/VScrollFixture.js';
-import { afterEachLogs } from '../fixture/after-each-logs.js';
-import { createFixture } from '../fixture/create-fixture.js';
-import { ITestConfig } from 'types/index.js';
+import { makeTest, Misc, TestConfig } from '../scaffolding';
 
-test.afterEach(afterEachLogs);
+type Config = TestConfig & {
+  datasourceSettings: NonNullable<TestConfig['datasourceSettings']>;
+  templateSettings: NonNullable<TestConfig['templateSettings']>;
+};
+
+interface ExpectedRange {
+  bufferRange: [number, number];
+}
+
+interface ExpectedLoad extends ExpectedRange {
+  loops: number;
+}
+
+interface GoldenCase<Expected extends ExpectedRange = ExpectedRange> {
+  config: Config;
+  expected: Expected;
+}
 
-const configList: ITestConfig[] = [
+const configs: Config[] = [
   {
-    datasourceGet: (index, count, success) => {
-      const data = [];
-      for (let i = index; i < index + count; i++) {
-        if (i >= -49 && i <= 100) {
-          data.push({ id: i, text: `item #${i}` });
-        }
-      }
-      setTimeout(() => success(data), 25);
-    },
     datasourceSettings: {
       startIndex: 1,
       padding: 0.5,
@@ -27,15 +30,6 @@ const configList: ITestConfig[] = [
     templateSettings: { viewportHeight: 200, itemHeight: 20 }
   },
   {
-    datasourceGet: (index, count, success) => {
-      const data = [];
-      for (let i = index; i < index + count; i++) {
-        if (i >= -69 && i <= 1300) {
-          data.push({ id: i, text: `item #${i}` });
-        }
-      }
-      setTimeout(() => success(data), 25);
-    },
     datasourceSettings: {
       startIndex: 600,
       padding: 1.2,
@@ -46,15 +40,6 @@ const configList: ITestConfig[] = [
     templateSettings: { viewportHeight: 100, itemHeight: 40 }
   },
   {
-    datasourceGet: (index, count, success) => {
-      const data = [];
-      for (let i = index; i < index + count; i++) {
-        if (i >= 169 && i <= 230) {
-          data.push({ id: i, text: `item #${i}` });
-        }
-      }
-      setTimeout(() => success(data), 25);
-    },
     datasourceSettings: {
       startIndex: 174,
       padding: 0.7,
@@ -65,15 +50,6 @@ const configList: ITestConfig[] = [
     templateSettings: { viewportHeight: 50, itemHeight: 25 }
   },
   {
-    datasourceGet: (index, count, success) => {
-      const data = [];
-      for (let i = index; i < index + count; i++) {
-        if (i >= 20 && i <= 230) {
-          data.push({ id: i, text: `item #${i}` });
-        }
-      }
-      setTimeout(() => success(data), 25);
-    },
     datasourceSettings: {
       startIndex: 33,
       padding: 0.62,
@@ -85,15 +61,6 @@ const configList: ITestConfig[] = [
     templateSettings: { viewportWidth: 450, itemWidth: 100, horizontal: true }
   },
   {
-    datasourceGet: (index, count, success) => {
-      const data = [];
-      for (let i = index; i < index + count; i++) {
-        if (i >= -40 && i <= 159) {
-          data.push({ id: i, text: `item #${i}` });
-        }
-      }
-      setTimeout(() => success(data), 25);
-    },
     datasourceSettings: {
       startIndex: 1,
       padding: 0.25,
@@ -110,340 +77,210 @@ const configList: ITestConfig[] = [
   }
 ];
 
-const noItemSizeConfigList: ITestConfig[] = configList.map(
-  ({
-    datasourceGet,
-    datasourceSettings: { itemSize: _, ...restDatasourceSettings },
-    ...config
-  }) => ({
-    ...config,
-    datasourceGet,
-    datasourceSettings: { ...restDatasourceSettings }
-  })
-);
-
-const commonConfig = configList[0]; // [-49, ..., 100]
+const withoutSetting = (
+  config: Config,
+  setting: 'itemSize' | 'minIndex' | 'maxIndex'
+): Config => {
+  const datasourceSettings = { ...config.datasourceSettings };
+  delete datasourceSettings[setting];
+  return { ...config, datasourceSettings };
+};
 
-const startIndexAroundMinIndexConfigList: ITestConfig[] = [
-  {
-    ...commonConfig,
-    datasourceSettings: {
-      ...commonConfig.datasourceSettings,
-      startIndex: -9999
-    }
-  },
-  {
-    ...commonConfig,
-    datasourceSettings: { ...commonConfig.datasourceSettings, startIndex: -50 }
-  },
-  {
-    ...commonConfig,
-    datasourceSettings: { ...commonConfig.datasourceSettings, startIndex: -49 }
-  },
-  {
-    ...commonConfig,
-    datasourceSettings: { ...commonConfig.datasourceSettings, startIndex: -48 }
-  }
+const commonExpected: ExpectedLoad[] = [
+  { bufferRange: [-4, 15], loops: 3 },
+  { bufferRange: [595, 605], loops: 3 },
+  { bufferRange: [169, 178], loops: 3 },
+  { bufferRange: [28, 40], loops: 3 },
+  { bufferRange: [-9, 48], loops: 3 }
+];
+const noItemSizeExpected: ExpectedLoad[] = [
+  { bufferRange: [-4, 15], loops: 4 },
+  { bufferRange: [595, 609], loops: 4 },
+  { bufferRange: [169, 178], loops: 3 },
+  { bufferRange: [28, 42], loops: 4 },
+  { bufferRange: [-9, 48], loops: 4 }
+];
+const aroundMinExpected: ExpectedRange[] = [
+  { bufferRange: [-49, -35] },
+  { bufferRange: [-49, -35] },
+  { bufferRange: [-49, -35] },
+  { bufferRange: [-49, -34] }
+];
+const aroundMaxExpected: ExpectedRange[] = [
+  { bufferRange: [86, 100] },
+  { bufferRange: [86, 100] },
+  { bufferRange: [86, 100] },
+  { bufferRange: [86, 100] }
 ];
 
-const startIndexAroundMaxIndexConfigList: ITestConfig[] = [
-  {
-    ...commonConfig,
-    datasourceSettings: { ...commonConfig.datasourceSettings, startIndex: 99 }
-  },
-  {
-    ...commonConfig,
-    datasourceSettings: { ...commonConfig.datasourceSettings, startIndex: 100 }
-  },
-  {
-    ...commonConfig,
-    datasourceSettings: { ...commonConfig.datasourceSettings, startIndex: 101 }
-  },
-  {
-    ...commonConfig,
-    datasourceSettings: { ...commonConfig.datasourceSettings, startIndex: 999 }
+const zip = <Expected extends ExpectedRange>(
+  configs: Config[],
+  expected: Expected[]
+): GoldenCase<Expected>[] => {
+  if (configs.length !== expected.length) {
+    throw new Error(
+      `golden mismatch: ${configs.length} configs vs ${expected.length} expected`
+    );
   }
-];
+  return configs.map((config, index) => ({
+    config,
+    expected: expected[index]
+  }));
+};
 
-const noMaxIndexConfigList: ITestConfig[] = configList.map(
-  ({
-    datasourceGet,
-    datasourceSettings: { maxIndex: _, ...datasourceSettings },
-    ...config
-  }) => ({ ...config, datasourceGet, datasourceSettings })
+const commonCases = zip(configs, commonExpected);
+const noMaxCases = zip(
+  configs.map(config => withoutSetting(config, 'maxIndex')),
+  commonExpected
 );
-
-const noMinIndexConfigList: ITestConfig[] = configList.map(
-  ({
-    datasourceGet,
-    datasourceSettings: { minIndex: _, ...datasourceSettings },
-    ...config
-  }) => ({ ...config, datasourceGet, datasourceSettings })
+const noMinCases = zip(
+  configs.map(config => withoutSetting(config, 'minIndex')),
+  commonExpected
+);
+const noItemSizeCases = zip(
+  configs.map(config => withoutSetting(config, 'itemSize')),
+  noItemSizeExpected
 );
 
-const forwardGapConfigList: ITestConfig[] =
-  startIndexAroundMaxIndexConfigList.map(
-    ({
-      datasourceGet,
-      datasourceSettings: { minIndex: _, ...datasourceSettings },
-      ...config
-    }) => ({ ...config, datasourceGet, datasourceSettings })
-  );
-
-const checkMinMaxIndexes = async (fixture: VScrollFixture) => {
-  const elements = await fixture.getElements();
-  const bufferInfo = await fixture.adapter.bufferInfo;
-  const { firstIndex, lastIndex, minIndex, maxIndex } = bufferInfo;
-  const _minIndex = await fixture.getElementIndex(elements[0]);
-  const _maxIndex = await fixture.getElementIndex(
-    elements[elements.length - 1]
-  );
-
-  expect(firstIndex).toEqual(minIndex);
-  expect(lastIndex).toEqual(maxIndex);
-  expect(minIndex).toEqual(_minIndex);
-  expect(maxIndex).toEqual(_maxIndex);
-};
-
-const getParams = ({
-  datasourceSettings: settings
-}: ITestConfig): {
-  maxIndex: number;
-  minIndex: number;
-  itemSize: number;
-  startIndex: number;
-  padding: number;
-} => ({
-  maxIndex: settings.maxIndex as number,
-  minIndex: settings.minIndex as number,
-  itemSize: settings.itemSize as number,
-  startIndex: settings.startIndex as number,
-  padding: settings.padding as number
-});
-
-const testCommonCase = async (fixture: VScrollFixture, config: ITestConfig) => {
-  await fixture.adapter.relax();
-
-  const bufferSize = await fixture.scroller.settings.bufferSize;
-  const {
-    maxIndex,
-    minIndex,
-    itemSize: _itemSize,
-    startIndex,
-    padding
-  } = getParams(config);
-  const viewportSize = await fixture.scroller.viewport.getSize();
-  const viewportSizeDelta = viewportSize * padding;
-  const itemSize = _itemSize || (await fixture.scroller.buffer.defaultSize);
-  const hasMinIndex = minIndex !== undefined;
-  const hasMaxIndex = maxIndex !== undefined;
-  let innerLoopCount = 3;
-
-  const _negativeItemsAmount = Math.ceil(viewportSizeDelta / itemSize);
-  const negativeItemsAmount = Math.max(_negativeItemsAmount, bufferSize);
-  const _positiveItemsAmount = Math.ceil(
-    (viewportSize + viewportSizeDelta) / itemSize
-  );
-  let positiveItemsAmount = Math.max(_positiveItemsAmount, bufferSize);
+const commonConfig = configs[0];
+const aroundMinCases = zip(
+  [-9999, -50, -49, -48].map<Config>(startIndex => ({
+    ...commonConfig,
+    datasourceSettings: { ...commonConfig.datasourceSettings, startIndex }
+  })),
+  aroundMinExpected
+);
+const aroundMaxConfigs = [99, 100, 101, 999].map<Config>(startIndex => ({
+  ...commonConfig,
+  datasourceSettings: { ...commonConfig.datasourceSettings, startIndex }
+}));
+const aroundMaxCases = zip(aroundMaxConfigs, aroundMaxExpected);
+const forwardGapConfigs = aroundMaxConfigs.map(config =>
+  withoutSetting(config, 'minIndex')
+);
 
-  if (!_itemSize) {
-    // if Settings.itemSize is not set, then there could be 1 more fetch
-    const positiveDiff = _positiveItemsAmount - bufferSize;
-    if (positiveDiff > 0) {
-      innerLoopCount = 4;
-      // if the additional fetch size is less than bufferSize
-      if (positiveDiff < bufferSize) {
-        positiveItemsAmount = 2 * bufferSize;
-      }
+const getItemSize = (misc: Misc, config: Config): number =>
+  config.datasourceSettings.itemSize ?? misc.scroller.buffer.defaultSize;
+
+const testCommonCase =
+  ({ config, expected }: GoldenCase<ExpectedLoad>) =>
+  (misc: Misc) =>
+  async () => {
+    await misc.relaxNext();
+
+    const { minIndex, maxIndex, startIndex } = config.datasourceSettings;
+    const size = getItemSize(misc, config);
+
+    misc.expect.consistent();
+    misc.expect.bufferRange(expected.bufferRange);
+    expect(misc.innerLoopCount).toEqual(expected.loops);
+    misc.expect.startVisible(startIndex as number);
+
+    expect(misc.adapter.bufferInfo.absMinIndex).toEqual(minIndex ?? -Infinity);
+    expect(misc.adapter.bufferInfo.absMaxIndex).toEqual(maxIndex ?? Infinity);
+
+    const { firstIndex, lastIndex } = misc.adapter.bufferInfo;
+    if (minIndex !== undefined && maxIndex !== undefined) {
+      expect(misc.getScrollableSize()).toEqual(
+        (maxIndex - minIndex + 1) * size
+      );
+    } else if (minIndex !== undefined) {
+      expect(misc.getScrollableSize()).toEqual(
+        (lastIndex - minIndex + 1) * size
+      );
+    } else if (maxIndex !== undefined) {
+      expect(misc.getScrollableSize()).toEqual(
+        (maxIndex - firstIndex + 1) * size
+      );
     }
-  }
-
-  const bufferInfo = await fixture.adapter.bufferInfo;
-
-  if (hasMinIndex) {
-    const negativeSize = (startIndex - minIndex) * itemSize;
-    const negativeItemsSize = negativeItemsAmount * itemSize;
-    const bwdPaddingSize = negativeSize - negativeItemsSize;
-    const _bwdPaddingSize =
-      await fixture.scroller.viewport.paddings[Direction.backward].size;
-    expect(_bwdPaddingSize).toEqual(bwdPaddingSize);
-    expect(bufferInfo.absMinIndex).toEqual(minIndex);
-  } else {
-    expect(bufferInfo.absMinIndex).toEqual(-Infinity);
-  }
-
-  if (hasMaxIndex) {
-    const positiveSize = (maxIndex - startIndex + 1) * itemSize;
-    const positiveItemsSize = positiveItemsAmount * itemSize;
-    const fwdPaddingSize = positiveSize - positiveItemsSize;
-    const _fwdPaddingSize =
-      await fixture.scroller.viewport.paddings[Direction.forward].size;
-    expect(_fwdPaddingSize).toEqual(fwdPaddingSize);
-    expect(bufferInfo.absMaxIndex).toEqual(maxIndex);
-  } else {
-    expect(bufferInfo.absMaxIndex).toEqual(Infinity);
-  }
-
-  let totalSize = 0;
-  if (hasMinIndex && hasMaxIndex) {
-    totalSize = (maxIndex - minIndex + 1) * itemSize;
-  } else if (hasMinIndex) {
-    const knownSize = (startIndex - minIndex) * itemSize;
-    totalSize = knownSize + positiveItemsAmount * itemSize;
-  } else if (hasMaxIndex) {
-    const knownSize = (maxIndex - startIndex + 1) * itemSize;
-    totalSize = knownSize + negativeItemsAmount * itemSize;
-  }
-
-  const _totalSize = await fixture.scroller.viewport.getScrollableSize();
-  const _innerLoopCount = await fixture.workflow.innerLoopCount;
-  expect(_totalSize).toEqual(totalSize);
-  expect(_innerLoopCount).toEqual(innerLoopCount);
-  await checkMinMaxIndexes(fixture);
-};
-
-const testStartIndexEdgeCase = async (
-  fixture: VScrollFixture,
-  config: ITestConfig
-) => {
-  await fixture.adapter.relax();
-
-  const { maxIndex, minIndex, itemSize, startIndex, padding } =
-    getParams(config);
-  const bufferInfo = await fixture.adapter.bufferInfo;
-  const viewportSize = await fixture.scroller.viewport.getSize();
-  const totalSize = (maxIndex - minIndex + 1) * itemSize;
-  const viewportSizeDelta = viewportSize * padding;
-  let _startIndex = Math.max(minIndex, startIndex); // startIndex < minIndex
-  _startIndex = Math.min(maxIndex, _startIndex); // startIndex > maxIndex
-
-  // visible part of the viewport must be filled
-  const viewportItemsAmount = Math.ceil(viewportSize / itemSize);
-  const diff = _startIndex + viewportItemsAmount - maxIndex - 1;
-  if (diff > 0) {
-    _startIndex -= diff;
-  }
-
-  const negativeSize = (_startIndex - minIndex) * itemSize;
-  const negativeItemsAmount = Math.ceil(viewportSizeDelta / itemSize);
-  const negativeItemsSize = negativeItemsAmount * itemSize;
-  const bwdPaddingSize = Math.max(0, negativeSize - negativeItemsSize);
-
-  const positiveSize = (maxIndex - _startIndex + 1) * itemSize;
-  const positiveItemsAmount = Math.ceil(
-    (viewportSize + viewportSizeDelta) / itemSize
-  );
-  const positiveItemsSize = positiveItemsAmount * itemSize;
-  const fwdPaddingSize = Math.max(0, positiveSize - positiveItemsSize);
-
-  const _totalSize = await fixture.scroller.viewport.getScrollableSize();
-  const _bwdPaddingSize =
-    await fixture.scroller.viewport.paddings[Direction.backward].size;
-  const _fwdPaddingSize =
-    await fixture.scroller.viewport.paddings[Direction.forward].size;
-  expect(_totalSize).toEqual(totalSize);
-  expect(_bwdPaddingSize).toEqual(bwdPaddingSize);
-  expect(_fwdPaddingSize).toEqual(fwdPaddingSize);
-
-  expect(bufferInfo.absMinIndex).toEqual(minIndex);
-  expect(bufferInfo.absMaxIndex).toEqual(maxIndex);
-  await checkMinMaxIndexes(fixture);
-};
-
-const testForwardGapCase = async (fixture: VScrollFixture) => {
-  await fixture.adapter.relax();
-
-  const gapSize = await fixture.page.evaluate(() => {
-    const viewportChildren =
-      window.__vscroll__.workflow.scroller.routines.element.children;
-    const lastChild = viewportChildren[viewportChildren.length - 2];
-    const lastChildBottom = lastChild.getBoundingClientRect().bottom;
-    const viewport = window.__vscroll__.workflow.scroller.viewport;
-    const viewportSize = viewport.getSize();
-    let gap = viewportSize - lastChildBottom;
-    gap = Math.max(0, gap);
-    return gap;
-  });
-
-  expect(gapSize).toEqual(0);
-  expect(
-    await fixture.scroller.viewport.paddings[Direction.forward].size
-  ).toEqual(0);
+  };
+
+const testStartIndexEdge =
+  ({ config, expected }: GoldenCase) =>
+  (misc: Misc) =>
+  async () => {
+    await misc.relaxNext();
+
+    const minIndex = config.datasourceSettings.minIndex as number;
+    const maxIndex = config.datasourceSettings.maxIndex as number;
+    const size = getItemSize(misc, config);
+
+    misc.expect.consistent();
+    misc.expect.bufferRange(expected.bufferRange);
+    expect(misc.getScrollableSize()).toEqual((maxIndex - minIndex + 1) * size);
+    expect(misc.adapter.bufferInfo.absMinIndex).toEqual(minIndex);
+    expect(misc.adapter.bufferInfo.absMaxIndex).toEqual(maxIndex);
+  };
+
+const testForwardGap = (misc: Misc) => async () => {
+  await misc.relaxNext();
+  misc.expect.consistent();
+  misc.expect.noForwardGap();
 };
 
-const makeTest = (
+const registerGolden = <Expected extends ExpectedRange>(
   title: string,
-  config: ITestConfig,
-  testFunc: (fixture: VScrollFixture, config: ITestConfig) => Promise<void>
-) => {
-  test(title, async ({ page }) => {
-    const fixture = await createFixture({ page, config });
-    await testFunc(fixture, config);
-    await fixture.dispose();
-  });
+  testTitle: string,
+  cases: GoldenCase<Expected>[],
+  scenario: (
+    testCase: GoldenCase<Expected>
+  ) => (misc: Misc) => () => Promise<void>
+): void => {
+  describe(title, () =>
+    cases.forEach((testCase, index) =>
+      makeTest({
+        config: testCase.config,
+        title: `${testTitle} (config ${index})`,
+        it: scenario(testCase)
+      })
+    )
+  );
 };
 
-test.describe('Min/max Indexes Spec', () => {
-  test.describe('Common cases', () =>
-    configList.forEach((config, index) =>
-      makeTest(
-        `should fill the viewport and the paddings (config ${index})`,
-        config,
-        testCommonCase
-      )
-    ));
-
-  test.describe('No maxIndex cases', () =>
-    noMaxIndexConfigList.forEach((config, index) =>
-      makeTest(
-        `should fill the viewport and backward padding (config ${index})`,
-        config,
-        testCommonCase
-      )
-    ));
-
-  test.describe('No minIndex cases', () =>
-    noMinIndexConfigList.forEach((config, index) =>
-      makeTest(
-        `should fill the viewport and forward padding (config ${index})`,
-        config,
-        testCommonCase
-      )
-    ));
-
-  test.describe('No itemSize cases', () =>
-    noItemSizeConfigList.forEach((config, index) =>
-      makeTest(
-        `should fill the viewport and the paddings (config ${index})`,
-        config,
-        testCommonCase
-      )
-    ));
-
-  test.describe('startIndex around minIndex', () =>
-    startIndexAroundMinIndexConfigList.forEach((config, index) =>
-      makeTest(
-        `should reset backward padding (config ${index})`,
-        config,
-        testStartIndexEdgeCase
-      )
-    ));
-
-  test.describe('startIndex around maxIndex', () =>
-    startIndexAroundMaxIndexConfigList.forEach((config, index) =>
-      makeTest(
-        `should reset forward padding (config ${index})`,
-        config,
-        testStartIndexEdgeCase
-      )
-    ));
+describe('Min/max Indexes Spec', () => {
+  registerGolden(
+    'Common cases',
+    'should fill the viewport and the paddings',
+    commonCases,
+    testCommonCase
+  );
+  registerGolden(
+    'No maxIndex cases',
+    'should fill the viewport and backward padding',
+    noMaxCases,
+    testCommonCase
+  );
+  registerGolden(
+    'No minIndex cases',
+    'should fill the viewport and forward padding',
+    noMinCases,
+    testCommonCase
+  );
+  registerGolden(
+    'No itemSize cases',
+    'should fill the viewport and the paddings',
+    noItemSizeCases,
+    testCommonCase
+  );
+  registerGolden(
+    'startIndex around minIndex',
+    'should reset backward padding',
+    aroundMinCases,
+    testStartIndexEdge
+  );
+  registerGolden(
+    'startIndex around maxIndex',
+    'should reset forward padding',
+    aroundMaxCases,
+    testStartIndexEdge
+  );
 
-  test.describe('startIndex around maxIndex and no minIndex', () =>
-    forwardGapConfigList.forEach((config, index) =>
-      makeTest(
-        `should fill forward padding gap (config ${index})`,
+  describe('startIndex around maxIndex and no minIndex', () =>
+    forwardGapConfigs.forEach((config, index) =>
+      makeTest({
         config,
-        testForwardGapCase
-      )
+        title: `should fill forward padding gap (config ${index})`,
+        it: testForwardGap
+      })
     ));
 });
diff --git a/tests/e2e/specs/recreation.spec.ts b/tests/e2e/specs/recreation.spec.ts
index 4752833d..99bdff36 100644
--- a/tests/e2e/specs/recreation.spec.ts
+++ b/tests/e2e/specs/recreation.spec.ts
@@ -1,182 +1,104 @@
-import { test, expect, Page } from '@playwright/test';
-import { afterEachLogs } from '../fixture/after-each-logs.js';
-import { createFixture } from '../fixture/create-fixture.js';
-import { ITestConfig } from 'types/index.js';
-
-test.afterEach(afterEachLogs);
-
-const datasourceGet = (
-  index: number,
-  count: number,
-  success: (data: unknown[]) => void
-): void => {
-  const data = [];
-  for (let i = index; i < index + count; i++) {
-    data.push({ id: i, text: `item #${i}` });
-  }
-  setTimeout(() => success(data), 0);
-};
-
-const baseConfig: ITestConfig = {
-  datasourceGet,
+import {
+  makeTest,
+  Misc,
+  TestConfig,
+  Workflow
+} from '../scaffolding';
+
+const baseConfig: TestConfig = {
   datasourceSettings: { startIndex: 1, bufferSize: 5, padding: 0.5 },
   templateSettings: { viewportHeight: 200, itemHeight: 20 }
 };
 
-type RecreationBox = {
-  adapterInitCount: number;
-  wfInitOnFirstMake: boolean;
-};
-type WithRecreationResult = Window & { __recreationBox?: RecreationBox };
-
-const onBefore = async (page: Page) =>
-  page.evaluate(() => {
-    const w = window as WithRecreationResult;
-    const { datasource } = w.__vscroll__;
+const getWorkflowState = <Data,>(workflow: Workflow<Data>) => ({
+  initialized: workflow.isInitialized,
+  internalAdapterInitialized: workflow.scroller?.adapter?.init,
+  disposed: workflow.disposed
+});
 
-    // Subscribe to init$ BEFORE creating workflow
-    const box: RecreationBox = {
-      adapterInitCount: 0,
-      wfInitOnFirstMake: false
-    };
-    w.__recreationBox = box;
+const getInstanceState = (misc: Misc) => ({
+  initialized: misc.workflow.isInitialized,
+  scrollerId: misc.scroller.settings.instanceIndex,
+  internalAdapterId: misc.scroller.adapter.id,
+  adapterId: misc.adapter.id,
+  elementCount: misc.getElements().length
+});
 
-    datasource.adapter.init$.on(value => {
-      if (!value) {
-        return;
-      }
-      if (++box.adapterInitCount === 1) {
-        // First init - capture initial workflow state
-        box.wfInitOnFirstMake = w.__vscroll__.workflow.isInitialized;
+describe('Recreation Spec', () => {
+  describe('Destroying (plain DS)', () => {
+    makeTest({
+      config: { ...baseConfig, noAdapter: true, skipInvariantAutoCheck: true },
+      title: 'should not reset Datasource on destroy',
+      it: misc => async () => {
+        await misc.relaxNext();
+        const workflow = misc.workflow;
+        const before = getWorkflowState(workflow);
+
+        misc.dispose();
+        const after = getWorkflowState(workflow);
+
+        expect(before.initialized).toBe(true);
+        expect(before.internalAdapterInitialized).toBe(true);
+        expect(before.disposed).toBe(false);
+        expect(after.initialized).toBe(false);
+        expect(after.internalAdapterInitialized).toBe(undefined);
+        expect(after.disposed).toBe(true);
       }
     });
   });
 
-test.describe('Recreation Spec', () => {
-  test.describe('Destroying (plain DS)', () => {
-    test('should not reset Datasource on destroy', async ({ page }) => {
-      const fixture = await createFixture({
-        page,
-        config: { ...baseConfig, noAdapter: true }
-      });
-
-      const getWorkflowData = () =>
-        page.evaluate(() => ({
-          workflowInit: window.__vscroll__.workflow.isInitialized,
-          internalAdapterInit:
-            window.__vscroll__.workflow?.scroller?.adapter?.init,
-          disposed: window.__vscroll__.workflow.disposed
-        }));
-
-      // Store workflow data before cleanup
-      const before = await getWorkflowData();
-
-      // Destroy the scroller
-      await fixture.dispose();
-
-      // Wait a bit to ensure no async errors
-      await page.waitForTimeout(25);
-
-      // Store workflow data after cleanup
-      const after = await getWorkflowData();
-
-      expect(before.workflowInit).toBe(true);
-      expect(after.workflowInit).toBe(false);
-      expect(before.internalAdapterInit).toBe(true);
-      expect(after.internalAdapterInit).toBe(undefined);
-      expect(before.disposed).toBe(false);
-      expect(after.disposed).toBe(true);
-    });
-
-    // Note: Test 1.2 ('should not reset Datasource on destroy via ngIf') is deferred.
-    // It requires viewport removal detection feature (Routines.onViewportRemoved with MutationObserver)
-    // to automatically call workflow.dispose() when viewport element is removed from DOM.
-  });
-
-  test.describe('Recreation via ngIf (instance DS)', () => {
-    test('should switch Adapter.init trice', async ({ page }) => {
-      const fixture = await createFixture({
-        page,
-        config: { ...baseConfig, noRelaxOnStart: true, onBefore }
-      });
-
-      const result = await page.evaluate(async () => {
-        const w = window as WithRecreationResult;
-        const { datasource, makeScroller } = w.__vscroll__;
-        // 3 recreation cycles: 1 from onBefore and 2 from this loop
-        for (let i = 0; i < 2; i++) {
-          // Recreate scroller workflow, and wait for adapter is initialized
-          w.__vscroll__.workflow.dispose();
-          makeScroller!();
-          await new Promise(r => datasource.adapter.init$.once(r));
-        }
-        return w.__recreationBox;
-      });
-
-      await fixture.adapter.relax();
-
-      // Workflow should not be initialized immediately after creation
-      expect(result.wfInitOnFirstMake).toBe(false);
-
-      // Adapter should be initialized 3 times
-      expect(result.adapterInitCount).toBe(3);
-
-      await fixture.dispose();
+  describe('Recreation (instance DS)', () => {
+    makeTest({
+      config: baseConfig,
+      title: 'should switch Adapter.init three times',
+      it: misc => async () => {
+        let initCount = 0;
+        let initializedDuringFirstAdapterInit = true;
+        const off = misc.adapter.init$.on(initialized => {
+          if (initialized && ++initCount === 1) {
+            initializedDuringFirstAdapterInit = misc.workflow.isInitialized;
+          }
+        });
+
+        await misc.relaxNext();
+        await misc.recreate();
+        await misc.recreate();
+        off();
+
+        expect(initializedDuringFirstAdapterInit).toBe(false);
+        expect(initCount).toBe(3);
+      }
     });
 
-    test('should re-render the viewport', async ({ page }) => {
-      const fixture = await createFixture({ page, config: baseConfig });
-
-      // Helper to capture state
-      const getState = () =>
-        page.evaluate(() => ({
-          workflowInit: window.__vscroll__.workflow.isInitialized,
-          scrollerId:
-            window.__vscroll__.workflow.scroller.settings.instanceIndex,
-          internalAdapterId: window.__vscroll__.workflow.scroller.adapter.id,
-          adapterId: window.__vscroll__.datasource.adapter.id
-        }));
-
-      // Capture initial state
-      const before = await getState();
-      const beforeElements = await fixture.getElements();
-
-      // Dispose and recreate
-      await fixture.recreateScroller();
-      await fixture.adapter.relax();
-
-      // Capture state after recreation
-      const after = await getState();
-      const afterElements = await fixture.getElements();
-
-      // Verify expectations
-      expect(after.workflowInit).toBe(true);
-      expect(after.scrollerId).toBe(before.scrollerId + 1); // New scroller instance
-      expect(after.internalAdapterId).toBe(before.adapterId); // Scroller uses same adapter
-      expect(after.adapterId).toBe(before.adapterId); // Same external adapter
-      expect(afterElements.length).toBe(beforeElements.length); // Same number of elements
-
-      await fixture.dispose();
+    makeTest({
+      config: baseConfig,
+      title: 'should re-render the viewport',
+      it: misc => async () => {
+        await misc.relaxNext();
+        const before = getInstanceState(misc);
+
+        await misc.recreate();
+        const after = getInstanceState(misc);
+
+        expect(after.initialized).toBe(true);
+        expect(after.scrollerId).toBe(before.scrollerId + 1);
+        expect(after.internalAdapterId).toBe(before.adapterId);
+        expect(after.adapterId).toBe(before.adapterId);
+        expect(after.elementCount).toBe(before.elementCount);
+      }
     });
 
-    test('should scroll and take firstVisible', async ({ page }) => {
-      const fixture = await createFixture({ page, config: baseConfig });
-
-      await fixture.recreateScroller();
-      await page.waitForFunction(
-        () => window.__vscroll__.datasource.adapter.init
-      );
-      await fixture.adapter.relax();
+    makeTest({
+      config: baseConfig,
+      title: 'should scroll and take firstVisible',
+      it: misc => async () => {
+        await misc.relaxNext();
+        await misc.recreate();
+        expect(misc.adapter.firstVisible.$index).toBe(1);
 
-      const firstVisible = await fixture.adapter.firstVisible;
-      expect(firstVisible.$index).toBe(1);
-
-      await fixture.scrollTo(200);
-
-      const firstVisibleAfter = await fixture.adapter.firstVisible;
-      expect(firstVisibleAfter.$index).toBeGreaterThan(1);
-
-      await fixture.dispose();
+        await misc.scrollToRelax(200);
+        expect(misc.adapter.firstVisible.$index).toBeGreaterThan(1);
+      }
     });
   });
 });
diff --git a/tests/e2e/specs/scroll-basic.spec.ts b/tests/e2e/specs/scroll-basic.spec.ts
index 35002d5e..6ac1139c 100644
--- a/tests/e2e/specs/scroll-basic.spec.ts
+++ b/tests/e2e/specs/scroll-basic.spec.ts
@@ -1,55 +1,90 @@
-import { test, expect } from '@playwright/test';
 import {
-  VScrollFixture,
   Direction,
-  type DirectionType
-} from '../fixture/VScrollFixture.js';
-import { afterEachLogs } from '../fixture/after-each-logs.js';
-import { createFixture } from '../fixture/create-fixture.js';
-import { ItemsCounter } from '../helpers/itemsCounter.js';
-import { ITestConfig } from 'types/index.js';
-
-test.afterEach(afterEachLogs);
-
-type IConfig = ITestConfig<{
-  direction: DirectionType;
+  getDatasource,
+  makeTest,
+  Misc,
+  TestConfig
+} from '../scaffolding';
+
+interface ScrollPlan {
+  direction: Direction;
   count: number;
   bouncing?: boolean;
   mass?: boolean;
-}>;
+}
+
+type Config = TestConfig<ScrollPlan> & {
+  custom: ScrollPlan;
+  datasourceSettings: NonNullable<TestConfig['datasourceSettings']> & {
+    startIndex: number;
+    bufferSize: number;
+    padding: number;
+    itemSize: number;
+  };
+  templateSettings: NonNullable<TestConfig['templateSettings']>;
+};
 
-const configList: IConfig[] = [
+type BaseConfig = Omit<Config, 'custom'>;
+
+/**
+ * Settled state captured EMPIRICALLY for one (scenario, baseConfig) pair once
+ * the scroll sequence completes. These values encode vscroll's own fetch/clip/
+ * padding decisions, so they are hardcoded rather than recomputed here —
+ * recomputing would duplicate the scroller logic under test (the "oracle" we
+ * deliberately avoid).
+ *
+ * - `range`: buffer edge indexes [firstIndex, lastIndex] left in the buffer.
+ * - `oppositePadding`: px size of the padding opposite the final scroll
+ *   direction (the scrolled-to side is always 0, asserted separately).
+ *
+ * To regenerate after an intentional algorithm change, log
+ * `misc.adapter.bufferInfo` / `misc.padding[dir].getSize()` inside `testScroll`.
+ */
+interface Golden {
+  range: [number, number];
+  oppositePadding: number;
+}
+
+interface Scenario {
+  suite: string;
+  plan: (index: number) => ScrollPlan;
+  title: (plan: ScrollPlan, index: number) => string;
+  golden: Golden[];
+}
+
+const baseConfigs: BaseConfig[] = [
   {
+    datasource: () => getDatasource({ delay: 25 }),
     datasourceSettings: {
       startIndex: 100,
       bufferSize: 4,
       padding: 0.22,
       itemSize: 20
     },
-    templateSettings: { viewportHeight: 71, itemHeight: 20 },
-    custom: { direction: Direction.forward, count: 1 }
+    templateSettings: { viewportHeight: 71, itemHeight: 20 }
   },
   {
+    datasource: () => getDatasource({ delay: 25 }),
     datasourceSettings: {
       startIndex: 1,
       bufferSize: 5,
       padding: 0.2,
       itemSize: 20
     },
-    templateSettings: { viewportHeight: 100, itemHeight: 20 },
-    custom: { direction: Direction.forward, count: 1 }
+    templateSettings: { viewportHeight: 100, itemHeight: 20 }
   },
   {
+    datasource: () => getDatasource({ delay: 25 }),
     datasourceSettings: {
       startIndex: -15,
       bufferSize: 12,
       padding: 0.98,
       itemSize: 20
     },
-    templateSettings: { viewportHeight: 66, itemHeight: 20 },
-    custom: { direction: Direction.forward, count: 1 }
+    templateSettings: { viewportHeight: 66, itemHeight: 20 }
   },
   {
+    datasource: () => getDatasource({ delay: 25 }),
     datasourceSettings: {
       startIndex: 1,
       bufferSize: 5,
@@ -57,10 +92,14 @@ const configList: IConfig[] = [
       horizontal: true,
       itemSize: 100
     },
-    templateSettings: { viewportWidth: 450, itemWidth: 100, horizontal: true },
-    custom: { direction: Direction.forward, count: 1 }
+    templateSettings: {
+      viewportWidth: 450,
+      itemWidth: 100,
+      horizontal: true
+    }
   },
   {
+    datasource: () => getDatasource({ delay: 25 }),
     datasourceSettings: {
       startIndex: -74,
       bufferSize: 4,
@@ -68,327 +107,189 @@ const configList: IConfig[] = [
       horizontal: true,
       itemSize: 75
     },
-    templateSettings: { viewportWidth: 300, itemWidth: 75, horizontal: true },
-    custom: { direction: Direction.forward, count: 1 }
+    templateSettings: {
+      viewportWidth: 300,
+      itemWidth: 75,
+      horizontal: true
+    }
   }
 ];
 
-// Helper functions (ported from original)
-const treatIndex = (index: number) => (index <= 3 ? index : 3 * 2 - index);
+const treatIndex = (index: number): number => (index <= 3 ? index : 6 - index);
 
-const doScrollMax = async (config: IConfig, fixture: VScrollFixture) => {
-  if (config.custom.direction === Direction.forward) {
-    await fixture.scrollMax();
-  } else {
-    await fixture.scrollMin();
-  }
-};
+const invert = (direction: Direction): Direction =>
+  direction === Direction.forward ? Direction.backward : Direction.forward;
 
-const invertDirection = (config: IConfig) => {
-  const _forward = config.custom.direction === Direction.forward;
-  config.custom.direction = _forward ? Direction.backward : Direction.forward;
-};
+const scrollToEdge = (misc: Misc, direction: Direction): Promise<void> =>
+  direction === Direction.forward
+    ? misc.scrollMaxRelax()
+    : misc.scrollMinRelax();
 
-const getInitialItemsCounter = async (
-  fixture: VScrollFixture,
-  config: IConfig
-): Promise<ItemsCounter> => {
-  const edgeItem = await fixture.scroller.buffer.getEdgeVisibleItem(
-    Direction.forward
-  );
-  const oppositeItem = await fixture.scroller.buffer.getEdgeVisibleItem(
-    Direction.backward
-  );
-  const result = new ItemsCounter();
+const testScroll =
+  (config: Config, golden: Golden) => (misc: Misc) => async () => {
+    await misc.relaxNext();
 
-  if (!edgeItem || !oppositeItem) {
-    return result;
-  }
+    const { count, bouncing, mass } = config.custom;
+    const middleCycle = Math.ceil((count + 1) / 2);
+    let direction = config.custom.direction;
 
-  const startIndex = config.datasourceSettings.startIndex;
+    for (let cycle = 2; cycle <= count + 1; cycle++) {
+      if (bouncing || (mass && cycle === middleCycle)) {
+        direction = invert(direction);
+      }
+      await scrollToEdge(misc, direction);
+    }
 
-  result.set(Direction.forward, {
-    count: edgeItem.$index - startIndex + 1,
-    index: edgeItem.$index,
-    padding: 0,
-    size: 0
-  });
-  result.set(Direction.backward, {
-    count: startIndex - oppositeItem.$index,
-    index: oppositeItem.$index,
-    padding: 0,
-    size: NaN
+    misc.expect.bufferRange(golden.range);
+    expect(misc.padding[direction].getSize()).toBe(0);
+    expect(misc.padding[invert(direction)].getSize()).toBe(
+      golden.oppositePadding
+    );
+    misc.expect.viewportFilled();
+  };
+
+const repeatedPlan =
+  (direction: Direction) =>
+  (index: number): ScrollPlan => ({
+    direction,
+    count: 3 + treatIndex(index)
   });
 
-  return result;
-};
-
-const getFullHouseDiff = (
-  viewportSize: number,
-  paddingDelta: number,
-  itemSize: number,
-  bufferSize: number
-): number => {
-  const sizeToFill = viewportSize + 2 * paddingDelta;
-  const itemsToFillNotRounded = sizeToFill / itemSize;
-  const itemsToFillRounded = Math.ceil(sizeToFill / itemSize);
-  const itemsToFill =
-    itemsToFillRounded + (itemsToFillNotRounded === itemsToFillRounded ? 0 : 1);
-  const bufferSizeDiff = bufferSize - itemsToFill;
-  return Math.max(0, bufferSizeDiff);
-};
-
-const getCurrentItemsCounter = async (
-  fixture: VScrollFixture,
-  direction: DirectionType,
-  previous: ItemsCounter,
-  config: IConfig
-): Promise<ItemsCounter> => {
-  const bufferSize = config.datasourceSettings.bufferSize;
-  const padding = config.datasourceSettings.padding;
-  const viewportSize = await fixture.scroller.viewport.getSize();
-  const itemSize = await fixture.scroller.buffer.defaultSize;
-  const fwd = direction === Direction.forward;
-  const opposite = fwd ? Direction.backward : Direction.forward;
-  const delta = viewportSize * padding;
-
-  // handle direction (fetch)
-  const fullHouseDiff = getFullHouseDiff(
-    viewportSize,
-    delta,
-    itemSize,
-    bufferSize
-  );
-  const _singleFetchCount = Math.ceil(delta / itemSize);
-  const singleFetchCount = Math.max(bufferSize, _singleFetchCount);
-  const itemsToFetch =
-    previous.direction && previous.direction !== direction
-      ? _singleFetchCount + fullHouseDiff
-      : singleFetchCount;
-  const newDirIndex =
-    previous.get(direction).index +
-    (fwd ? 1 : -1) * (previous.get(direction).padding / itemSize) +
-    (fwd ? 1 : -1) * itemsToFetch;
-
-  // handle opposite (clip)
-  const oppPadding = previous.get(opposite).padding;
-  const previousTotalSize = previous.total * itemSize + previous.paddings;
-  const sizeToClip = previousTotalSize - oppPadding - viewportSize - delta;
-  const itemsToClip = Math.floor(sizeToClip / itemSize);
-  const newOppIndex =
-    previous.get(opposite).index + (fwd ? 1 : -1) * itemsToClip;
-  const newOppPadding = itemsToClip * itemSize + oppPadding;
-
-  const result = new ItemsCounter(direction);
-  result.set(direction, {
-    index: newDirIndex,
-    padding: 0,
-    count: NaN,
-    size: NaN
-  });
-  result.set(opposite, {
-    index: newOppIndex,
-    padding: newOppPadding,
-    count: NaN,
-    size: NaN
+const alternatingPlan =
+  (direction: Direction, mode: 'bouncing' | 'mass') =>
+  (index: number): ScrollPlan => ({
+    direction,
+    count: (3 + treatIndex(index)) * 2,
+    [mode]: true
   });
-  return result;
-};
 
-// Main test function
-const shouldScroll = async (fixture: VScrollFixture, config: IConfig) => {
-  const custom = config.custom;
-  const wfCount = custom.count + 1;
-  const wfCountMiddle = Math.ceil(wfCount / 2);
-  let itemsCounter: ItemsCounter;
-  let cycles = 1;
-
-  // Initial state
-  itemsCounter = await getInitialItemsCounter(fixture, config);
-
-  // Perform scrolls
-  while (cycles < wfCount) {
-    cycles++;
-
-    if (custom.bouncing) {
-      invertDirection(config);
-    } else if (custom.mass) {
-      if (cycles === wfCountMiddle) {
-        invertDirection(config);
-      }
-    }
-
-    await doScrollMax(config, fixture);
+const scenarios: Scenario[] = [
+  {
+    suite: 'Single max fwd scroll event',
+    plan: () => ({ direction: Direction.forward, count: 1 }),
+    title: (_plan, index) =>
+      `should process 1 forward max scroll (config ${index})`,
+    golden: [
+      { range: [100, 108], oppositePadding: 80 },
+      { range: [1, 11], oppositePadding: 100 },
+      { range: [-10, 8], oppositePadding: 340 },
+      { range: [1, 14], oppositePadding: 500 },
+      { range: [-74, -64], oppositePadding: 300 }
+    ]
+  },
+  {
+    suite: 'Single max bwd scroll event',
+    plan: () => ({ direction: Direction.backward, count: 1 }),
+    title: (_plan, index) =>
+      `should process 1 backward max scroll (config ${index})`,
+    golden: [
+      { range: [92, 100], oppositePadding: 80 },
+      { range: [-9, 1], oppositePadding: 100 },
+      { range: [-39, -21], oppositePadding: 340 },
+      { range: [-9, 4], oppositePadding: 500 },
+      { range: [-82, -72], oppositePadding: 300 }
+    ]
+  },
+  {
+    suite: 'Mass max fwd scroll events',
+    plan: repeatedPlan(Direction.forward),
+    title: (plan, index) =>
+      `should process ${plan.count} forward scrolls (config ${index})`,
+    golden: [
+      { range: [108, 116], oppositePadding: 240 },
+      { range: [16, 26], oppositePadding: 400 },
+      { range: [38, 56], oppositePadding: 1300 },
+      { range: [26, 39], oppositePadding: 3000 },
+      { range: [-58, -48], oppositePadding: 1500 }
+    ]
+  },
+  {
+    suite: 'Mass max bwd scroll events',
+    plan: repeatedPlan(Direction.backward),
+    title: (plan, index) =>
+      `should process ${plan.count} backward scrolls (config ${index})`,
+    golden: [
+      { range: [84, 92], oppositePadding: 240 },
+      { range: [-24, -14], oppositePadding: 400 },
+      { range: [-87, -69], oppositePadding: 1300 },
+      { range: [-34, -21], oppositePadding: 3000 },
+      { range: [-98, -88], oppositePadding: 1500 }
+    ]
+  },
+  {
+    suite: 'Bouncing max two-directional scroll events (fwd started)',
+    plan: alternatingPlan(Direction.forward, 'bouncing'),
+    title: (plan, index) =>
+      `should process ${plan.count} bouncing scrolls (config ${index})`,
+    golden: [
+      { range: [102, 107], oppositePadding: 240 },
+      { range: [4, 10], oppositePadding: 320 },
+      { range: [10, 21], oppositePadding: 1380 },
+      { range: [26, 39], oppositePadding: 6000 },
+      { range: [-62, -53], oppositePadding: 2400 }
+    ]
+  },
+  {
+    suite: 'Bouncing max two-directional scroll events (bwd started)',
+    plan: alternatingPlan(Direction.backward, 'bouncing'),
+    title: (plan, index) =>
+      `should process ${plan.count} bouncing scrolls (config ${index})`,
+    golden: [
+      { range: [93, 98], oppositePadding: 240 },
+      { range: [-8, -2], oppositePadding: 320 },
+      { range: [-52, -41], oppositePadding: 1380 },
+      { range: [-34, -21], oppositePadding: 6000 },
+      { range: [-93, -84], oppositePadding: 2400 }
+    ]
+  },
+  {
+    suite:
+      'Mass two-directional scroll events (first half fwd, second half bwd)',
+    plan: alternatingPlan(Direction.forward, 'mass'),
+    title: (plan, index) =>
+      `should process ${plan.count} two-directional scrolls (config ${index})`,
+    golden: [
+      { range: [83, 91], oppositePadding: 420 },
+      { range: [-25, -15], oppositePadding: 720 },
+      { range: [-92, -74], oppositePadding: 2360 },
+      { range: [-39, -26], oppositePadding: 6000 },
+      { range: [-101, -91], oppositePadding: 2925 }
+    ]
+  },
+  {
+    suite:
+      'Mass two-directional scroll events (first half bwd, second half fwd)',
+    plan: alternatingPlan(Direction.backward, 'mass'),
+    title: (plan, index) =>
+      `should process ${plan.count} two-directional scrolls (config ${index})`,
+    golden: [
+      { range: [109, 117], oppositePadding: 420 },
+      { range: [17, 27], oppositePadding: 720 },
+      { range: [43, 61], oppositePadding: 2360 },
+      { range: [31, 44], oppositePadding: 6000 },
+      { range: [-55, -45], oppositePadding: 2925 }
+    ]
+  }
+];
 
-    itemsCounter = await getCurrentItemsCounter(
-      fixture,
-      custom.direction,
-      itemsCounter,
-      config
+const registerScenario = (scenario: Scenario): void => {
+  if (scenario.golden.length !== baseConfigs.length) {
+    throw new Error(
+      `golden mismatch in "${scenario.suite}": ` +
+        `${scenario.golden.length} vs ${baseConfigs.length} configs`
     );
   }
-
-  // Final expectations
-  const direction: DirectionType = custom.direction;
-  const opposite: DirectionType =
-    direction === Direction.forward ? Direction.backward : Direction.forward;
-
-  const edgeItem = await fixture.scroller.buffer.getEdgeVisibleItem(direction);
-  const oppositeItem =
-    await fixture.scroller.buffer.getEdgeVisibleItem(opposite);
-  const edgeItemIndex = itemsCounter.get(direction).index;
-  const oppositeItemIndex = itemsCounter.get(opposite).index;
-
-  // await new Promise(resolve => setTimeout(resolve, 1000000));
-  expect(edgeItem && edgeItem.$index).toEqual(edgeItemIndex);
-  expect(oppositeItem && oppositeItem.$index).toEqual(oppositeItemIndex);
-  expect(await fixture.scroller.viewport.paddings[direction].size).toEqual(
-    itemsCounter.get(direction).padding
-  );
-  expect(await fixture.scroller.viewport.paddings[opposite].size).toEqual(
-    itemsCounter.get(opposite).padding
-  );
-  expect(await fixture.checkElementContentByIndex(edgeItemIndex)).toEqual(true);
-  expect(await fixture.checkElementContentByIndex(oppositeItemIndex)).toEqual(
-    true
-  );
-};
-
-const makeTest = (title: string, config: IConfig) => {
-  test(title, async ({ page }) => {
-    config.datasourceGet = (index, count, success) => {
-      const data = [];
-      for (let i = index; i < index + count; i++) {
-        data.push({ id: i, text: `item #${i}` });
-      }
-      setTimeout(() => success(data), 25);
-    };
-    const fixture = await createFixture({ page, config });
-    await shouldScroll(fixture, config);
-    await fixture.dispose();
+  describe(scenario.suite, () => {
+    baseConfigs.forEach((baseConfig, index) => {
+      const plan = scenario.plan(index);
+      const config: Config = { ...baseConfig, custom: plan };
+      makeTest({
+        config,
+        title: scenario.title(plan, index),
+        it: testScroll(config, scenario.golden[index])
+      });
+    });
   });
 };
 
-// Test suites
-test.describe('Basic Scroll Spec', () => {
-  test.describe('Single max fwd scroll event', () =>
-    configList.forEach((config, index) =>
-      makeTest(`should process 1 forward max scroll (config ${index})`, config)
-    ));
-
-  test.describe('Single max bwd scroll event', () =>
-    configList
-      .map(config => ({
-        ...config,
-        custom: {
-          ...config.custom,
-          direction: Direction.backward
-        }
-      }))
-      .forEach((config, index) =>
-        makeTest(
-          `should process 1 backward max scroll (config ${index})`,
-          config
-        )
-      ));
-
-  test.describe('Mass max fwd scroll events', () =>
-    configList
-      .map((config, index) => ({
-        ...config,
-        custom: {
-          direction: Direction.forward,
-          count: 3 + treatIndex(index)
-        }
-      }))
-      .forEach((config, index) =>
-        makeTest(
-          `should process ${config.custom.count} forward scrolls (config ${index})`,
-          config
-        )
-      ));
-
-  test.describe('Mass max bwd scroll events', () =>
-    configList
-      .map((config, index) => ({
-        ...config,
-        custom: {
-          direction: Direction.backward,
-          count: 3 + treatIndex(index)
-        }
-      }))
-      .forEach((config, index) =>
-        makeTest(
-          `should process ${config.custom.count} backward scrolls (config ${index})`,
-          config
-        )
-      ));
-
-  test.describe('Bouncing max two-directional scroll events (fwd started)', () =>
-    configList
-      .map((config, index) => ({
-        ...config,
-        custom: {
-          direction: Direction.forward,
-          count: (3 + treatIndex(index)) * 2,
-          bouncing: true
-        }
-      }))
-      .forEach((config, index) =>
-        makeTest(
-          `should process ${config.custom.count} bouncing scrolls (config ${index})`,
-          config
-        )
-      ));
-
-  test.describe('Bouncing max two-directional scroll events (bwd started)', () =>
-    configList
-      .map((config, index) => ({
-        ...config,
-        custom: {
-          direction: Direction.backward,
-          count: (3 + treatIndex(index)) * 2,
-          bouncing: true
-        }
-      }))
-      .forEach((config, index) =>
-        makeTest(
-          `should process ${config.custom.count} bouncing scrolls (config ${index})`,
-          config
-        )
-      ));
-
-  test.describe('Mass two-directional scroll events (first half fwd, second half bwd)', () =>
-    configList
-      .map((config, index) => ({
-        ...config,
-        custom: {
-          direction: Direction.forward,
-          count: (3 + treatIndex(index)) * 2,
-          mass: true
-        }
-      }))
-      .forEach((config, index) =>
-        makeTest(
-          `should process ${config.custom.count} two-directional scrolls (config ${index})`,
-          config
-        )
-      ));
-
-  test.describe('Mass two-directional scroll events (first half bwd, second half fwd)', () =>
-    configList
-      .map((config, index) => ({
-        ...config,
-        custom: {
-          direction: Direction.backward,
-          count: (3 + treatIndex(index)) * 2,
-          mass: true
-        }
-      }))
-      .forEach((config, index) =>
-        makeTest(
-          `should process ${config.custom.count} two-directional scrolls (config ${index})`,
-          config
-        )
-      ));
-});
+describe('Basic Scroll Spec', () => scenarios.forEach(registerScenario));
diff --git a/tests/e2e/specs/scroll-delay.spec.ts b/tests/e2e/specs/scroll-delay.spec.ts
index bcbc0c14..6ff97e2b 100644
--- a/tests/e2e/specs/scroll-delay.spec.ts
+++ b/tests/e2e/specs/scroll-delay.spec.ts
@@ -1,152 +1,109 @@
-import { test, expect } from '@playwright/test';
-import { afterEachLogs } from '../fixture/after-each-logs.js';
-import { createFixture } from '../fixture/create-fixture.js';
-import { ITestConfig } from 'types/index.js';
-
-test.afterEach(afterEachLogs);
+import {
+  getDatasource,
+  makeTest,
+  Misc,
+  TestConfig
+} from '../scaffolding';
+
+const baseConfig: TestConfig = {
+  datasource: () => getDatasource({ delay: 150 }),
+  datasourceSettings: {
+    startIndex: 1,
+    bufferSize: 5,
+    padding: 0.5,
+    itemSize: 20
+  },
+  templateSettings: { viewportHeight: 200, itemHeight: 20 },
+  timeout: 5000
+};
 
-const datasourceGet: ITestConfig['datasourceGet'] = (index, count, success) => {
-  const data = [];
-  for (let i = index; i < index + count; i++) {
-    data.push({ id: i, text: `item #${i}` });
+const waitUntilCycle = async (misc: Misc, target: number): Promise<void> => {
+  while (misc.workflow.cyclesDone < target) {
+    await misc.waitNextCycle();
   }
-  setTimeout(() => success(data), 150);
+  await misc.adapter.relax();
 };
 
-/**
- * Test: Throttled scroll event handling
- *
- * Rapidly triggers multiple scroll operations and verifies that the workflow
- * throttles them into fewer cycles than the number of scroll events.
- */
-test.describe('Delay Scroll Spec', () => {
-  test('should work with throttled scroll event handling', async ({ page }) => {
-    const config: ITestConfig = {
-      datasourceGet,
-      datasourceSettings: {
-        startIndex: 1,
-        bufferSize: 5,
-        padding: 0.5,
-        itemSize: 20
-      },
-      datasourceDevSettings: {
-        throttle: 500
-      },
-      templateSettings: {
-        viewportHeight: 200,
-        itemHeight: 20
+const runAlternatingBurst = (
+  misc: Misc,
+  count: number,
+  interval: number
+): Promise<number> =>
+  new Promise(resolve => {
+    let completed = 0;
+    const timer = setInterval(() => {
+      completed++;
+      if (completed % 2 === 0) {
+        misc.scrollMin();
+      } else {
+        misc.scrollMax();
       }
-    };
-
-    const fixture = await createFixture({ page, config });
-    const initCyclesCount = await fixture.workflow.cyclesDone;
-    expect(initCyclesCount).toBe(1);
-
-    // Start rapid scrolling and monitor cycles in browser context
-    const count = await page.evaluate(() => {
-      return new Promise<number>(resolve => {
-        const COUNT = 10;
-        let scrollCount = 0;
-        let timer: ReturnType<typeof setInterval>;
-        const workflow = window.__vscroll__.workflow;
-        const adapter = window.__vscroll__.datasource.adapter;
-
-        // Subscribe to cyclesDone$ - resolve when cycle 3 completes
-        workflow.cyclesDone$.on(cycles => {
-          if (cycles === 3) {
-            resolve(scrollCount);
-          }
-        });
+      if (completed === count) {
+        clearInterval(timer);
+        resolve(completed);
+      }
+    }, interval);
+  });
 
-        // Start the scrolling timer after cycle 1 completes (already completed)
-        timer = setInterval(() => {
-          scrollCount++;
-          if (scrollCount % 2 === 0) {
-            adapter.fix({ scrollPosition: 0 }); // scrollMin
-          } else {
-            adapter.fix({ scrollPosition: Infinity }); // scrollMax
-          }
-          if (scrollCount === COUNT) {
-            clearInterval(timer);
-          }
-        }, 10);
-      });
+const startProgressiveBurst = (misc: Misc, startPosition: number) => {
+  let count = 0;
+  let endPosition = startPosition;
+  const frames = new Set<number>();
+  const timer = setInterval(() => {
+    const frame = requestAnimationFrame(() => {
+      frames.delete(frame);
+      endPosition = startPosition + ++count * 5;
+      misc.scrollTo(endPosition);
     });
+    frames.add(frame);
+  }, 25);
+
+  return {
+    stop: () => {
+      clearInterval(timer);
+      frames.forEach(cancelAnimationFrame);
+      frames.clear();
+    },
+    getEndPosition: () => endPosition
+  };
+};
 
-    // Verify all scrolls were executed
-    expect(count).toBe(10);
-
-    await fixture.dispose();
+describe('Delay Scroll Spec', () => {
+  makeTest({
+    config: {
+      ...baseConfig,
+      datasourceDevSettings: { throttle: 500 }
+    },
+    title: 'should work with throttled scroll event handling',
+    it: misc => async () => {
+      await misc.relaxNext();
+      expect(misc.workflow.cyclesDone).toBe(1);
+
+      const thirdCycle = waitUntilCycle(misc, 3);
+      const count = await runAlternatingBurst(misc, 10, 10);
+      await thirdCycle;
+
+      expect(count).toBe(10);
+    }
   });
 
-  test('should handle additional scrolling during slow fetch', async ({
-    page
-  }) => {
-    const config: ITestConfig = {
-      datasourceGet,
-      datasourceSettings: {
-        startIndex: 1,
-        bufferSize: 5,
-        padding: 0.5,
-        itemSize: 20
-      },
-      templateSettings: {
-        viewportHeight: 200,
-        itemHeight: 20
-      }
-    };
-
-    const fixture = await createFixture({ page, config });
-    const initCyclesCount = await fixture.workflow.cyclesDone;
-    expect(initCyclesCount).toBe(1);
-
-    const startPosition = await fixture.scroller.viewport.scrollPosition;
-
-    // Start rapid scrolling and monitor cycles in browser context
-    const result = await page.evaluate(
-      ({ start }) =>
-        new Promise<{ endPos: number; position: number }>(resolve => {
-          const COUNT = 10;
-          let scrollCount = 0;
-          let endPos: number;
-          let timer: ReturnType<typeof setInterval>;
-          const workflow = window.__vscroll__.workflow;
-          const adapter = window.__vscroll__.datasource.adapter;
-
-          // Subscribe to cyclesDone$ - stop timer when the nearest cycle completes (cycle 2)
-          workflow.cyclesDone$.on(count => {
-            if (count === 2) {
-              clearInterval(timer);
-              const position = workflow.scroller.viewport.scrollPosition;
-              resolve({ endPos, position });
-            }
-          });
-
-          // Start the scrolling timer
-          timer = setInterval(
-            () =>
-              requestAnimationFrame(() => {
-                scrollCount++;
-                endPos = start + scrollCount * 5;
-
-                // Trigger scroll via adapter.fix
-                adapter.fix({ scrollPosition: endPos });
-
-                // Stop timer if all scrolls done
-                if (scrollCount === COUNT) {
-                  clearInterval(timer);
-                }
-              }),
-            25
-          );
-        }),
-      { start: startPosition }
-    );
-
-    // Verify final position
-    expect(result.position).toBe(result.endPos);
-    expect(result.endPos).toBeGreaterThan(startPosition);
-
-    await fixture.dispose();
+  makeTest({
+    config: baseConfig,
+    title: 'should handle additional scrolling during slow fetch',
+    it: misc => async () => {
+      await misc.relaxNext();
+      expect(misc.workflow.cyclesDone).toBe(1);
+
+      const startPosition = misc.getScrollPosition();
+      const nextCycle = misc.waitNextCycle();
+      const burst = startProgressiveBurst(misc, startPosition);
+      await nextCycle;
+      burst.stop();
+      await misc.adapter.relax();
+
+      const endPosition = burst.getEndPosition();
+      expect(endPosition).toBeGreaterThan(startPosition);
+      expect(misc.getScrollPosition()).toBe(endPosition);
+    }
   });
 });
diff --git a/tests/e2e/specs/scroll-fast.spec.ts b/tests/e2e/specs/scroll-fast.spec.ts
index 7fba1fad..223aa462 100644
--- a/tests/e2e/specs/scroll-fast.spec.ts
+++ b/tests/e2e/specs/scroll-fast.spec.ts
@@ -1,47 +1,26 @@
-import { test, expect } from '@playwright/test';
-import { afterEachLogs } from '../fixture/after-each-logs.js';
-import { createFixture } from '../fixture/create-fixture.js';
 import {
   Direction,
-  VScrollFixture,
-  type DirectionType
-} from '../fixture/VScrollFixture.js';
-import { ITestConfig } from 'types/index.js';
+  getDatasource,
+  makeTest,
+  Misc,
+  TestConfig
+} from '../scaffolding';
 
-test.afterEach(afterEachLogs);
-
-interface ICustom {
+interface FastScrollConfig {
   items: number;
   scrollCount: number;
-  start: DirectionType;
+  finalEdge: Direction;
 }
-type IConfig = ITestConfig<ICustom>;
 
-// Datasource generators for limited ranges
-// Note: We can't use closure variables because the function gets serialized.
-const datasourceGet1to100 = (index, count, success) => {
-  const data = [];
-  for (let i = index; i < index + count; i++) {
-    if (i >= 1 && i <= 100) {
-      data.push({ id: i, text: `item #${i}` });
-    }
-  }
-  setTimeout(() => success(data), 25);
+type Config = TestConfig<FastScrollConfig> & {
+  custom: FastScrollConfig;
+  datasourceSettings: NonNullable<TestConfig['datasourceSettings']>;
+  templateSettings: NonNullable<TestConfig['templateSettings']>;
 };
 
-const datasourceGet51to200 = (index, count, success) => {
-  const data = [];
-  for (let i = index; i < index + count; i++) {
-    if (i >= 51 && i <= 200) {
-      data.push({ id: i, text: `item #${i}` });
-    }
-  }
-  setTimeout(() => success(data), 25);
-};
-
-const configList: IConfig[] = [
+const baseConfigs: Config[] = [
   {
-    datasourceGet: datasourceGet1to100,
+    datasource: () => getDatasource({ min: 1, max: 100, delay: 25 }),
     datasourceSettings: {
       startIndex: 1,
       bufferSize: 5,
@@ -50,10 +29,10 @@ const configList: IConfig[] = [
       maxIndex: 100
     },
     templateSettings: { viewportHeight: 100, itemHeight: 20 },
-    custom: { items: 100, scrollCount: 5, start: Direction.backward }
+    custom: { items: 100, scrollCount: 5, finalEdge: Direction.backward }
   },
   {
-    datasourceGet: datasourceGet1to100,
+    datasource: () => getDatasource({ min: 1, max: 100, delay: 25 }),
     datasourceSettings: {
       startIndex: 1,
       bufferSize: 3,
@@ -62,10 +41,10 @@ const configList: IConfig[] = [
       maxIndex: 100
     },
     templateSettings: { viewportHeight: 110, itemHeight: 20 },
-    custom: { items: 100, scrollCount: 8, start: Direction.backward }
+    custom: { items: 100, scrollCount: 8, finalEdge: Direction.backward }
   },
   {
-    datasourceGet: datasourceGet51to200,
+    datasource: () => getDatasource({ min: 51, max: 200, delay: 25 }),
     datasourceSettings: {
       startIndex: 51,
       bufferSize: 7,
@@ -74,10 +53,10 @@ const configList: IConfig[] = [
       maxIndex: 200
     },
     templateSettings: { viewportHeight: 69, itemHeight: 20 },
-    custom: { items: 150, scrollCount: 6, start: Direction.backward }
+    custom: { items: 150, scrollCount: 6, finalEdge: Direction.backward }
   },
   {
-    datasourceGet: datasourceGet51to200,
+    datasource: () => getDatasource({ min: 51, max: 200, delay: 25 }),
     datasourceSettings: {
       startIndex: 51,
       bufferSize: 20,
@@ -91,192 +70,65 @@ const configList: IConfig[] = [
       viewportHeight: 0,
       itemHeight: 20
     },
-    custom: { items: 150, scrollCount: 5, start: Direction.backward }
+    custom: { items: 150, scrollCount: 5, finalEdge: Direction.backward }
   }
 ];
 
-const configEofList: IConfig[] = configList.map(config => ({
+const eofConfigs = baseConfigs.map<Config>(config => ({
   ...config,
-  custom: {
-    ...config.custom,
-    start: Direction.forward
-  }
+  custom: { ...config.custom, finalEdge: Direction.forward }
 }));
 
-/**
- * Run fast alternating scrolls in browser context
- */
-const runFastScroll = (
-  fixture: VScrollFixture,
-  customConfig: ICustom
-): Promise<void> =>
-  fixture.page.evaluate(
-    ({ scrollCount, start }) =>
-      new Promise(resolve => {
-        const adapter = window.__vscroll__.datasource.adapter;
-        let iteration = 0;
-
-        const doScroll = () => {
-          setTimeout(() => {
-            // scrollMax
-            adapter.fix({ scrollPosition: Infinity });
-
-            setTimeout(async () => {
-              // scrollMin (except on last iteration for EOF tests)
-              if (iteration < scrollCount || start === 'backward') {
-                adapter.fix({ scrollPosition: 0 });
-              }
-
-              iteration++;
-              if (iteration <= scrollCount) {
-                doScroll();
-              } else {
-                resolve();
-              }
-            }, 25);
-          }, 25);
-        };
-
-        doScroll();
-      }),
-    { scrollCount: customConfig.scrollCount, start: customConfig.start }
-  );
-
-/**
- * Wait for expected edge element to be reached
- * Simple feedback loop: Wait → Check → Correct if needed → Repeat
- */
-const waitForExpectedEdge = async (
-  fixture: VScrollFixture,
-  config: IConfig
-): Promise<void> => {
-  const startIdx = config.datasourceSettings.startIndex as number;
-  const itemsCount = config.custom.items;
-  const timeout = 10000;
-  const startTime = Date.now();
-
-  while (true) {
-    // Check timeout
-    if (Date.now() - startTime > timeout) {
-      throw new Error('Timeout waiting for expected edge element');
-    }
-
-    // Step 1: Wait for workflow to be idle
-    await fixture.adapter.relax();
-
-    // Step 2: Get all state in ONE call
-    const state = await fixture.page.evaluate(() => {
-      const vscroll = window.__vscroll__;
-      const { buffer, viewport } = vscroll.workflow.scroller;
-      const Direction = window.VScroll.Direction;
-      const position = viewport.scrollPosition;
-      const eof = position === 0;
-      const direction = eof ? Direction.backward : Direction.forward;
-      const edgeItem = buffer.getEdgeVisibleItem(direction);
-
-      return {
-        bufferSize: buffer.size,
-        position,
-        eof,
-        edgeItem: edgeItem ? { $index: edgeItem.$index } : null
-      };
-    });
-
-    // Step 3: Do calculations/checks in Node.js
-    if (!state.bufferSize || !state.edgeItem) {
-      continue; // Buffer or edge item not ready
-    }
-
-    const expectedIndex = startIdx + (state.eof ? 0 : itemsCount - 1);
-
-    // Step 4: Check if we're at target edge
-    if (state.edgeItem.$index === expectedIndex) {
-      break; // Success!
-    }
-
-    // Step 5: Issue corrective scroll
-    await fixture.adapter.fix({
-      scrollPosition: state.eof ? 0 : Infinity
-    });
-  }
-};
-
-/**
- * Verify final expectations after fast scrolling
- */
-const verifyExpectations = async (
-  fixture: VScrollFixture,
-  config: IConfig
-): Promise<void> => {
-  const startIndex = config.datasourceSettings.startIndex as number;
-  const position = await fixture.scroller.viewport.scrollPosition;
-  const itemHeight = config.templateSettings.itemHeight || 20;
-
-  // Get buffer and padding info
-  const bufferSize = await fixture.scroller.buffer.size;
-  const backwardPadding =
-    await fixture.scroller.viewport.paddings[Direction.backward].size;
-  const forwardPadding =
-    await fixture.scroller.viewport.paddings[Direction.forward].size;
-
-  const bufferHeight = bufferSize * itemHeight;
-  const totalSize = backwardPadding + forwardPadding + bufferHeight;
-  const totalItemsHeight = config.custom.items * itemHeight;
-
-  // Verify total size matches expected
-  expect(totalSize).toBe(totalItemsHeight);
-  expect(bufferSize).toBeGreaterThan(0);
-
-  if (bufferSize > 0) {
-    if (position === 0) {
-      // At BOF - check first element
-      const first = await fixture.scroller.buffer.getEdgeVisibleItem(
-        Direction.backward
-      );
-      expect(first.$index).toBe(startIndex);
-    } else {
-      // At EOF - check last element
-      const last = await fixture.scroller.buffer.getEdgeVisibleItem(
-        Direction.forward
-      );
-      expect(last.$index).toBe(startIndex + config.custom.items - 1);
+const runFastScroll = async (misc: Misc, config: FastScrollConfig) => {
+  for (let iteration = 0; iteration <= config.scrollCount; iteration++) {
+    await misc.delay(25);
+    misc.scrollMax();
+    await misc.delay(25);
+    if (
+      iteration < config.scrollCount ||
+      config.finalEdge === Direction.backward
+    ) {
+      misc.scrollMin();
     }
   }
 };
 
-/**
- * Main test function
- */
-const shouldReachEdge = async (fixture: VScrollFixture, config: IConfig) => {
-  // Wait for initial load
-  await fixture.adapter.relax();
-
-  // Run fast scrolling and wait for it to complete
-  await runFastScroll(fixture, config.custom);
+const expectCompleteDataset = (misc: Misc, config: Config) => {
+  misc.expect.consistent();
+  const { buffer, viewport } = misc.scroller;
+  const itemSize = config.templateSettings.itemHeight || 20;
+  const totalSize =
+    viewport.paddings.backward.size +
+    buffer.size * itemSize +
+    viewport.paddings.forward.size;
 
-  // Wait for expected edge element
-  await waitForExpectedEdge(fixture, config);
+  expect(totalSize).toBe(config.custom.items * itemSize);
+  expect(buffer.size).toBeGreaterThan(0);
 
-  // Verify final state
-  await verifyExpectations(fixture, config);
+  const atBof = misc.getScrollPosition() === 0;
+  const edge = buffer.items[atBof ? 0 : buffer.items.length - 1];
+  const startIndex = config.datasourceSettings.startIndex as number;
+  const expectedIndex = startIndex + (atBof ? 0 : config.custom.items - 1);
+  expect(edge?.$index).toBe(expectedIndex);
 };
 
-const makeTest = (title: string, config: IConfig) => {
-  test(title, async ({ page }) => {
-    const fixture = await createFixture({ page, config });
-    await shouldReachEdge(fixture, config);
-    await fixture.dispose();
-  });
+const testFastScroll = (config: Config) => (misc: Misc) => async () => {
+  await misc.relaxNext();
+  await runFastScroll(misc, config.custom);
+  await misc.reachEdge(config.custom.finalEdge);
+  expectCompleteDataset(misc, config);
 };
 
-test.describe('Fast Scroll Spec', () => {
-  test.describe('multi-scroll to the BOF', () =>
-    configList.forEach((config, index) =>
-      makeTest(`should reach BOF without gaps (config ${index})`, config)
-    ));
+const registerCases = (configs: Config[], edge: 'BOF' | 'EOF') =>
+  configs.forEach((config, index) =>
+    makeTest({
+      config,
+      title: `should reach ${edge} without gaps (config ${index})`,
+      it: testFastScroll(config)
+    })
+  );
 
-  test.describe('multi-scroll to the EOF', () =>
-    configEofList.forEach((config, index) =>
-      makeTest(`should reach EOF without gaps (config ${index})`, config)
-    ));
+describe('Fast Scroll Spec', () => {
+  describe('multi-scroll to the BOF', () => registerCases(baseConfigs, 'BOF'));
+  describe('multi-scroll to the EOF', () => registerCases(eofConfigs, 'EOF'));
 });
diff --git a/tests/e2e/specs/viewport.spec.ts b/tests/e2e/specs/viewport.spec.ts
index d7575e14..544aed5d 100644
--- a/tests/e2e/specs/viewport.spec.ts
+++ b/tests/e2e/specs/viewport.spec.ts
@@ -1,110 +1,73 @@
-import { test, expect } from '@playwright/test';
-import { afterEachLogs } from '../fixture/after-each-logs.js';
-import { createFixture } from '../fixture/create-fixture.js';
-import { VScrollFixture } from '../fixture/VScrollFixture.js';
-import { ITestConfig } from 'types/index.js';
+import {
+  getDatasource,
+  makeTest,
+  Misc,
+  TestConfig
+} from '../scaffolding';
 
-test.afterEach(afterEachLogs);
-
-interface ICustom {
+interface CustomConfig {
   scrollTo?: number;
 }
-type IConfig = ITestConfig<ICustom>;
 
-// Datasource: limited callback (1-100)
-const datasourceGet = (index, count, success) => {
-  const data = [];
-  const start = Math.max(1, index);
-  const end = index + count - 1;
-  if (start > 100 || end < 1) {
-    success(data);
-    return;
-  }
-  const first = Math.max(1, start);
-  const last = Math.min(100, end);
-  for (let i = first; i <= last; i++) {
-    data.push({ id: i, text: `item #${i}` });
-  }
-  success(data);
+type ViewportConfig = TestConfig<CustomConfig> & {
+  custom: CustomConfig;
+  datasourceSettings: NonNullable<TestConfig['datasourceSettings']>;
+  templateSettings: NonNullable<TestConfig['templateSettings']>;
 };
 
-// Base config: windowViewport with 50px header
-const windowWith50HeaderConfig: IConfig = {
-  datasourceGet,
+const baseConfig: ViewportConfig = {
+  datasource: () => getDatasource({ min: 1, max: 100, delay: 1 }),
   datasourceSettings: { startIndex: 1, windowViewport: true },
-  templateSettings: {
-    itemHeight: 50,
-    noViewportClass: true,
-    viewportHeight: 0,
-    headerHeight: 50
-  },
-  custom: { scrollTo: undefined }
+  templateSettings: { itemHeight: 50, noViewportClass: true, headerHeight: 50 },
+  custom: {}
 };
 
-// Config with 500px header
-const windowWith500HeaderConfig: IConfig = {
-  ...windowWith50HeaderConfig,
-  templateSettings: {
-    ...windowWith50HeaderConfig.templateSettings,
-    headerHeight: 500
-  }
+const tallHeaderConfig: ViewportConfig = {
+  ...baseConfig,
+  templateSettings: { ...baseConfig.templateSettings, headerHeight: 500 }
 };
 
-// All test configurations
-const windowWithHeaderConfigList: IConfig[] = [
-  windowWith50HeaderConfig,
-  windowWith500HeaderConfig,
-  { ...windowWith50HeaderConfig, custom: { scrollTo: 99999 } },
-  { ...windowWith500HeaderConfig, custom: { scrollTo: 99999 } },
-  { ...windowWith500HeaderConfig, custom: { scrollTo: 450 } },
-  { ...windowWith500HeaderConfig, custom: { scrollTo: 50 } },
-  { ...windowWith500HeaderConfig, custom: { scrollTo: 500 } }
+const configs: ViewportConfig[] = [
+  baseConfig,
+  tallHeaderConfig,
+  { ...baseConfig, custom: { scrollTo: 99999 } },
+  { ...tallHeaderConfig, custom: { scrollTo: 99999 } },
+  { ...tallHeaderConfig, custom: { scrollTo: 450 } },
+  { ...tallHeaderConfig, custom: { scrollTo: 50 } },
+  { ...tallHeaderConfig, custom: { scrollTo: 500 } }
 ];
 
-// Test implementation
-const shouldWorkOnWindowWithHeader = async (
-  fixture: VScrollFixture,
-  config: IConfig
-) => {
-  const itemHeight = config.templateSettings.itemHeight || 50;
-  const headerHeight = config.templateSettings.headerHeight || 0;
-  let position = 0;
-  let index = 1;
-
-  // Wait for initial load
-  await fixture.adapter.relax();
+const testWindowViewport =
+  (config: ViewportConfig) => (misc: Misc) => async () => {
+    await misc.relaxNext();
 
-  if (config.custom?.scrollTo !== undefined) {
-    // Scroll (synchronous in browser)
-    await fixture.adapter.fix({ scrollPosition: config.custom.scrollTo });
-    // Read position immediately after scroll (before workflow processes it)
-    position = await fixture.scroller.viewport.scrollPosition;
-    index = Math.max(1, Math.ceil((position - headerHeight) / itemHeight));
-    // Now wait for workflow to process the scroll
-    await fixture.adapter.relax();
-  }
+    const itemHeight = config.templateSettings.itemHeight as number;
+    const headerHeight = config.templateSettings.headerHeight as number;
+    let position = 0;
+    let index = 1;
 
-  const actualPosition = await fixture.scroller.viewport.scrollPosition;
-  const firstVisible = await fixture.adapter.firstVisible;
-
-  expect(actualPosition).toBe(position);
-  expect(firstVisible.$index).toBe(index);
-};
+    if (config.custom.scrollTo !== undefined) {
+      await misc.scrollToRelax(config.custom.scrollTo);
+      position = misc.getScrollPosition();
+      index = Math.max(1, Math.ceil((position - headerHeight) / itemHeight));
+    }
 
-test.describe('Viewport Spec', () => {
-  test.describe('Entire Window with Header', () => {
-    windowWithHeaderConfigList.forEach((config, idx) => {
-      const scrollToText =
-        config.custom?.scrollTo !== undefined
-          ? ` scroll to ${config.custom.scrollTo}`
-          : ' not scroll';
-      const headerText = `${config.templateSettings.headerHeight}-offset`;
+    expect(misc.getScrollPosition()).toEqual(position);
+    expect(misc.adapter.firstVisible.$index).toEqual(index);
+  };
 
-      test(`should${scrollToText} with ${headerText}`, async ({ page }) => {
-        const fixture = await createFixture({ page, config });
-        await shouldWorkOnWindowWithHeader(fixture, config);
-        await fixture.dispose();
-      });
-    });
+describe('Viewport Spec', () => {
+  describe('Entire Window with Header', () => {
+    configs.forEach(config =>
+      makeTest({
+        config,
+        title: `should${
+          config.custom.scrollTo === undefined
+            ? ' not scroll'
+            : ` scroll to ${config.custom.scrollTo}`
+        } with ${config.templateSettings.headerHeight}-offset`,
+        it: testWindowViewport(config)
+      })
+    );
   });
 });
diff --git a/tests/e2e/tsconfig.json b/tests/e2e/tsconfig.json
index 3181a0c8..d0bae48a 100644
--- a/tests/e2e/tsconfig.json
+++ b/tests/e2e/tsconfig.json
@@ -1,18 +1,14 @@
 {
   "compilerOptions": {
-    "baseUrl": ".",
-    "outDir": "./dist",
-    "types": ["node", "@playwright/test"],
-    "module": "ESNext",
-    "moduleResolution": "bundler",
-    "esModuleInterop": true,
-    "skipLibCheck": true,
     "target": "ESNext",
+    "module": "ESNext",
+    "moduleResolution": "Bundler",
     "lib": ["ESNext", "DOM"],
-    "strict": false,
-    "allowJs": true,
-    "resolveJsonModule": true
+    "types": ["vitest/globals"],
+    "strict": true,
+    "strictPropertyInitialization": false,
+    "skipLibCheck": true,
+    "noEmit": true
   },
-  "include": ["**/*.ts", "types/**/*.d.ts"],
-  "exclude": ["node_modules", "dist"]
+  "include": ["./**/*.ts", "../../src/**/*.ts"]
 }
diff --git a/tests/e2e/types.ts b/tests/e2e/types.ts
new file mode 100644
index 00000000..328b41a0
--- /dev/null
+++ b/tests/e2e/types.ts
@@ -0,0 +1,44 @@
+import type {
+  DevSettings,
+  IDatasource,
+  Settings
+} from './scaffolding/vscroll';
+
+export interface TestItem {
+  id: number;
+  text: string;
+  size?: number;
+}
+
+export interface TemplateSettings {
+  noViewportClass?: boolean;
+  viewportHeight?: number;
+  viewportWidth?: number | null;
+  itemHeight?: number;
+  itemWidth?: number | null;
+  horizontal?: boolean;
+  dynamicSize?: string | null;
+  viewportPadding?: number;
+  headerHeight?: number;
+}
+
+export interface TestConfig<Custom = void, Data = TestItem> {
+  datasource?: () => IDatasource<Data>;
+  datasourceSettings?: Settings<Data>;
+  datasourceDevSettings?: DevSettings;
+  templateSettings?: TemplateSettings;
+  noAdapter?: boolean;
+  custom?: Custom;
+  timeout?: number;
+  skipInvariantAutoCheck?: boolean;
+}
+
+export interface IndexedItem<Data = TestItem> {
+  $index: number;
+  data: Data;
+}
+
+export type DatasourceProcessor<Data = TestItem> = (
+  items: IndexedItem<Data>[],
+  ...args: unknown[]
+) => unknown;
diff --git a/tests/e2e/types/global.d.ts b/tests/e2e/types/global.d.ts
deleted file mode 100644
index 945eda01..00000000
--- a/tests/e2e/types/global.d.ts
+++ /dev/null
@@ -1,29 +0,0 @@
-/**
- * Global type definitions for e2e tests
- * Extends Window with vscroll-specific properties
- */
-
-import * as VScroll from '../../../src/index';
-import type { IAdapter } from '../../../src/interfaces/adapter';
-import type { Workflow } from '../../../src/workflow';
-
-interface VScrollTest<ItemData = unknown> {
-  workflow: Workflow<ItemData>;
-  datasource: {
-    adapter?: IAdapter<ItemData>;
-  };
-  makeScroller?: () => Workflow<ItemData>; // Creates Workflow with fresh oldItems closure
-  Direction: {
-    forward: string;
-    backward: string;
-  };
-}
-
-declare global {
-  interface Window {
-    VScroll: typeof VScroll;
-    __vscroll__: VScrollTest;
-  }
-}
-
-export {};
diff --git a/tests/e2e/types/index.ts b/tests/e2e/types/index.ts
deleted file mode 100644
index 1985afd8..00000000
--- a/tests/e2e/types/index.ts
+++ /dev/null
@@ -1,39 +0,0 @@
-import type { Page } from '@playwright/test';
-import type { IDatasource, Item, Workflow } from '../../../src/index.js';
-import type {
-  Settings,
-  DevSettings
-} from '../../../src/interfaces/settings.js';
-
-export type { Page };
-export type { IDatasource, Item, Workflow };
-
-interface ITemplateSettings {
-  viewportHeight?: number;
-  viewportWidth?: number;
-  itemHeight?: number;
-  itemWidth?: number;
-  horizontal?: boolean;
-  noViewportClass?: boolean;
-  headerHeight?: number;
-}
-
-export interface ITestConfig<Custom = unknown> {
-  datasourceGet?: IDatasource['get'];
-  datasourceSettings: Settings;
-  datasourceDevSettings?: DevSettings;
-  templateSettings: ITemplateSettings;
-  noAdapter?: boolean;
-  noRelaxOnStart?: boolean;
-  custom?: Custom;
-  onBefore?: (page: Page) => Promise<void>;
-  templateFn?: (item: unknown) => string;
-}
-
-export interface VScrollFixtureConfig {
-  datasource: IDatasource;
-  noAdapter?: boolean;
-  templateSettings?: ITemplateSettings;
-  templateFn?: (item: unknown) => string;
-  onBefore?: (page: Page) => Promise<void>;
-}
diff --git a/tests/e2e/vitest.config.ts b/tests/e2e/vitest.config.ts
new file mode 100644
index 00000000..269823e2
--- /dev/null
+++ b/tests/e2e/vitest.config.ts
@@ -0,0 +1,54 @@
+import { fileURLToPath } from 'node:url';
+import { playwright } from '@vitest/browser-playwright';
+import { defineConfig } from 'vitest/config';
+
+const testsRoot = fileURLToPath(new URL('../', import.meta.url));
+const repositoryRoot = fileURLToPath(new URL('../../', import.meta.url));
+const sourceRoot = fileURLToPath(new URL('../../src/', import.meta.url)).replaceAll(
+  '\\',
+  '/'
+);
+const testFilesRoot = testsRoot.replaceAll('\\', '/');
+
+export default defineConfig({
+  root: testsRoot,
+  server: {
+    fs: {
+      allow: [repositoryRoot]
+    }
+  },
+  test: {
+    include: ['e2e/specs/**/*.spec.ts'],
+    fileParallelism: process.env.CI === 'true',
+    attachmentsDir: '.vitest-attachments',
+    globals: true,
+    testTimeout: 5000,
+    hookTimeout: 5000,
+    coverage: {
+      provider: 'istanbul',
+      allowExternal: true,
+      exclude: [
+        `${testFilesRoot}**/*`,
+        '**/node_modules/**',
+        `${sourceRoot}interfaces/**/*.ts`
+      ],
+      reportsDirectory: '../coverage/e2e',
+      reporter: ['text', 'json', 'json-summary', 'lcov', 'cobertura'],
+      thresholds: {
+        branches: 80,
+        functions: 80,
+        lines: 85,
+        statements: 85
+      }
+    },
+    browser: {
+      enabled: true,
+      provider: playwright(),
+      headless: true,
+      screenshotFailures: true,
+      screenshotDirectory: '.vitest-attachments/screenshots',
+      viewport: { width: 1024, height: 768 },
+      instances: [{ browser: 'chromium' }]
+    }
+  }
+});
diff --git a/tests/jest.config.js b/tests/jest.config.js
index 6bc5f98b..43e8f6ed 100644
--- a/tests/jest.config.js
+++ b/tests/jest.config.js
@@ -1,9 +1,38 @@
+import path from 'node:path';
+import { fileURLToPath } from 'node:url';
+
+const testsRoot = fileURLToPath(new URL('./', import.meta.url));
+const dependency = (...parts) => path.join(testsRoot, 'node_modules', ...parts);
+
 export default {
-  testMatch: ['**/unit/**/*.spec.ts'],
+  rootDir: '..',
+  testMatch: ['<rootDir>/tests/unit/**/*.spec.ts'],
   transform: {
-    '^.+\\.ts$': 'babel-jest'
+    '^.+\\.ts$': [
+      dependency('babel-jest'),
+      {
+        presets: [
+          [dependency('@babel', 'preset-env'), { targets: { node: 'current' } }],
+          dependency('@babel', 'preset-typescript')
+        ]
+      }
+    ]
   },
   moduleFileExtensions: ['ts', 'js'],
-  collectCoverageFrom: ['../src/**/*.ts'],
-  coveragePathIgnorePatterns: ['/node_modules/']
+  collectCoverageFrom: [
+    '<rootDir>/src/**/*.ts',
+    '!<rootDir>/src/interfaces/**/*.ts'
+  ],
+  coverageDirectory: '<rootDir>/coverage/unit',
+  coverageProvider: 'v8',
+  coverageReporters: ['text', 'json', 'json-summary', 'lcov', 'cobertura'],
+  coveragePathIgnorePatterns: ['/node_modules/'],
+  coverageThreshold: {
+    global: {
+      branches: 85,
+      functions: 40,
+      lines: 55,
+      statements: 55
+    }
+  }
 };
diff --git a/tests/package-lock.json b/tests/package-lock.json
index ed7d1be1..545f2b8a 100644
--- a/tests/package-lock.json
+++ b/tests/package-lock.json
@@ -8,24 +8,27 @@
       "name": "vscroll-tests",
       "version": "1.8.3",
       "devDependencies": {
-        "@babel/core": "^7.28.5",
-        "@babel/preset-env": "^7.28.5",
-        "@babel/preset-typescript": "^7.28.5",
-        "@playwright/test": "^1.57.0",
+        "@babel/core": "^7.29.7",
+        "@babel/preset-env": "^7.29.7",
+        "@babel/preset-typescript": "^7.29.7",
         "@types/jest": "^30.0.0",
-        "babel-jest": "^30.2.0",
-        "jest": "^30.2.0",
-        "typescript": "^5.9.3"
+        "@vitest/browser-playwright": "^4.1.10",
+        "@vitest/coverage-istanbul": "^4.1.10",
+        "babel-jest": "^30.4.1",
+        "jest": "^30.4.2",
+        "playwright": "^1.61.1",
+        "typescript": "^5.9.3",
+        "vitest": "^4.1.10"
       }
     },
     "node_modules/@babel/code-frame": {
-      "version": "7.27.1",
-      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.27.1.tgz",
-      "integrity": "sha512-cjQ7ZlQ0Mv3b47hABuTevyTuYN4i+loJKGeV9flcCgIK37cCXRh+L1bd3iBHlynerhQ7BhCkn2BPbQUL+rGqFg==",
+      "version": "7.29.7",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.29.7.tgz",
+      "integrity": "sha512-Aup7aUOfpbAUg2ROOJN6Iw5f9DMBlzu0mIkm/malLQFN/YQgO48wCj0Kxa3sEHJvPVFg7siR+qRInwXd2qhQKw==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "@babel/helper-validator-identifier": "^7.27.1",
+        "@babel/helper-validator-identifier": "^7.29.7",
         "js-tokens": "^4.0.0",
         "picocolors": "^1.1.1"
       },
@@ -34,9 +37,9 @@
       }
     },
     "node_modules/@babel/compat-data": {
-      "version": "7.28.5",
-      "resolved": "https://registry.npmjs.org/@babel/compat-data/-/compat-data-7.28.5.tgz",
-      "integrity": "sha512-6uFXyCayocRbqhZOB+6XcuZbkMNimwfVGFji8CTZnCzOHVGvDqzvitu1re2AU5LROliz7eQPhB8CpAMvnx9EjA==",
+      "version": "7.29.7",
+      "resolved": "https://registry.npmjs.org/@babel/compat-data/-/compat-data-7.29.7.tgz",
+      "integrity": "sha512-locTkQyKvwIEgBzVrn8693ebc97F2U8ZHjbXwDXJ5Fn2TCpNwTlKcaKLkdHop5c/icOFE7qt7Q9JC5hnKNa6Gg==",
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+      "version": "1.2.4",
+      "resolved": "https://registry.npmjs.org/tinyexec/-/tinyexec-1.2.4.tgz",
+      "integrity": "sha512-SHf/r48b7vOrjve9PxJo3MN5v5yuyjHvdUcrQffT3WXMUfnGmHDVbC4k3sHJaJTgZCwpUplIaAo5ANtMyp3YHg==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/tinyglobby": {
+      "version": "0.2.17",
+      "resolved": "https://registry.npmjs.org/tinyglobby/-/tinyglobby-0.2.17.tgz",
+      "integrity": "sha512-wXR/dYpcqKmfWpEdZjiKJOwCNFndD0DMnrW/cYjVGttEkBfVgcLFHoNrlj47mjOVic9yyNu65alsgF4NQyTa2g==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "fdir": "^6.5.0",
+        "picomatch": "^4.0.4"
+      },
+      "engines": {
+        "node": ">=12.0.0"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/SuperchupuDev"
+      }
+    },
+    "node_modules/tinyrainbow": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/tinyrainbow/-/tinyrainbow-3.1.0.tgz",
+      "integrity": "sha512-Bf+ILmBgretUrdJxzXM0SgXLZ3XfiaUuOj/IKQHuTXip+05Xn+uyEYdVg0kYDipTBcLrCVyUzAPz7QmArb0mmw==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=14.0.0"
+      }
+    },
     "node_modules/tmpl": {
       "version": "1.0.5",
       "resolved": "https://registry.npmjs.org/tmpl/-/tmpl-1.0.5.tgz",
@@ -5607,17 +8290,14 @@
       "dev": true,
       "license": "BSD-3-Clause"
     },
-    "node_modules/to-regex-range": {
-      "version": "5.0.1",
-      "resolved": "https://registry.npmjs.org/to-regex-range/-/to-regex-range-5.0.1.tgz",
-      "integrity": "sha512-65P7iz6X5yEr1cwcgvQxbbIw7Uk3gOy5dIdtZ4rDveLqhrdJP+Li/Hx6tyK0NEb+2GCyneCMJiGqrADCSNk8sQ==",
+    "node_modules/totalist": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/totalist/-/totalist-3.0.1.tgz",
+      "integrity": "sha512-sf4i37nQ2LBx4m3wB74y+ubopq6W/dIzXg0FDGjsYnZHVa1Da8FH853wlL2gtUhg+xJXjfk3kUZS3BRoQeoQBQ==",
       "dev": true,
       "license": "MIT",
-      "dependencies": {
-        "is-number": "^7.0.0"
-      },
       "engines": {
-        "node": ">=8.0"
+        "node": ">=6"
       }
     },
     "node_modules/tslib": {
@@ -5717,44 +8397,47 @@
       }
     },
     "node_modules/unrs-resolver": {
-      "version": "1.11.1",
-      "resolved": "https://registry.npmjs.org/unrs-resolver/-/unrs-resolver-1.11.1.tgz",
-      "integrity": "sha512-bSjt9pjaEBnNiGgc9rUiHGKv5l4/TGzDmYw3RhnkJGtLhbnnA/5qJj7x3dNDCRx/PJxu774LlH8lCOlB4hEfKg==",
+      "version": "1.12.2",
+      "resolved": "https://registry.npmjs.org/unrs-resolver/-/unrs-resolver-1.12.2.tgz",
+      "integrity": "sha512-dmlRxBJJayXjqTwC+JtF1HhJmgf3ftQ3YejFcZrf4+KKtJv0qDsK1pjqaaVjG7wJ5NJ6UVP1OqRMQ71Z4C3rxQ==",
       "dev": true,
       "hasInstallScript": true,
       "license": "MIT",
       "dependencies": {
-        "napi-postinstall": "^0.3.0"
+        "napi-postinstall": "^0.3.4"
       },
       "funding": {
         "url": "https://opencollective.com/unrs-resolver"
       },
       "optionalDependencies": {
-        "@unrs/resolver-binding-android-arm-eabi": "1.11.1",
-        "@unrs/resolver-binding-android-arm64": "1.11.1",
-        "@unrs/resolver-binding-darwin-arm64": "1.11.1",
-        "@unrs/resolver-binding-darwin-x64": "1.11.1",
-        "@unrs/resolver-binding-freebsd-x64": "1.11.1",
-        "@unrs/resolver-binding-linux-arm-gnueabihf": "1.11.1",
-        "@unrs/resolver-binding-linux-arm-musleabihf": "1.11.1",
-        "@unrs/resolver-binding-linux-arm64-gnu": "1.11.1",
-        "@unrs/resolver-binding-linux-arm64-musl": "1.11.1",
-        "@unrs/resolver-binding-linux-ppc64-gnu": "1.11.1",
-        "@unrs/resolver-binding-linux-riscv64-gnu": "1.11.1",
-        "@unrs/resolver-binding-linux-riscv64-musl": "1.11.1",
-        "@unrs/resolver-binding-linux-s390x-gnu": "1.11.1",
-        "@unrs/resolver-binding-linux-x64-gnu": "1.11.1",
-        "@unrs/resolver-binding-linux-x64-musl": "1.11.1",
-        "@unrs/resolver-binding-wasm32-wasi": "1.11.1",
-        "@unrs/resolver-binding-win32-arm64-msvc": "1.11.1",
-        "@unrs/resolver-binding-win32-ia32-msvc": "1.11.1",
-        "@unrs/resolver-binding-win32-x64-msvc": "1.11.1"
+        "@unrs/resolver-binding-android-arm-eabi": "1.12.2",
+        "@unrs/resolver-binding-android-arm64": "1.12.2",
+        "@unrs/resolver-binding-darwin-arm64": "1.12.2",
+        "@unrs/resolver-binding-darwin-x64": "1.12.2",
+        "@unrs/resolver-binding-freebsd-x64": "1.12.2",
+        "@unrs/resolver-binding-linux-arm-gnueabihf": "1.12.2",
+        "@unrs/resolver-binding-linux-arm-musleabihf": "1.12.2",
+        "@unrs/resolver-binding-linux-arm64-gnu": "1.12.2",
+        "@unrs/resolver-binding-linux-arm64-musl": "1.12.2",
+        "@unrs/resolver-binding-linux-loong64-gnu": "1.12.2",
+        "@unrs/resolver-binding-linux-loong64-musl": "1.12.2",
+        "@unrs/resolver-binding-linux-ppc64-gnu": "1.12.2",
+        "@unrs/resolver-binding-linux-riscv64-gnu": "1.12.2",
+        "@unrs/resolver-binding-linux-riscv64-musl": "1.12.2",
+        "@unrs/resolver-binding-linux-s390x-gnu": "1.12.2",
+        "@unrs/resolver-binding-linux-x64-gnu": "1.12.2",
+        "@unrs/resolver-binding-linux-x64-musl": "1.12.2",
+        "@unrs/resolver-binding-openharmony-arm64": "1.12.2",
+        "@unrs/resolver-binding-wasm32-wasi": "1.12.2",
+        "@unrs/resolver-binding-win32-arm64-msvc": "1.12.2",
+        "@unrs/resolver-binding-win32-ia32-msvc": "1.12.2",
+        "@unrs/resolver-binding-win32-x64-msvc": "1.12.2"
       }
     },
     "node_modules/update-browserslist-db": {
-      "version": "1.1.4",
-      "resolved": "https://registry.npmjs.org/update-browserslist-db/-/update-browserslist-db-1.1.4.tgz",
-      "integrity": "sha512-q0SPT4xyU84saUX+tomz1WLkxUbuaJnR1xWt17M7fJtEJigJeWUNGUqrauFXsHnqev9y9JTRGwk13tFBuKby4A==",
+      "version": "1.2.3",
+      "resolved": "https://registry.npmjs.org/update-browserslist-db/-/update-browserslist-db-1.2.3.tgz",
+      "integrity": "sha512-Js0m9cx+qOgDxo0eMiFGEueWztz+d4+M3rGlmKPT+T4IS/jP4ylw3Nwpu6cpTTP8R1MAC1kF4VbdLt3ARf209w==",
       "dev": true,
       "funding": [
         {
@@ -5797,6 +8480,174 @@
         "node": ">=10.12.0"
       }
     },
+    "node_modules/vite": {
+      "version": "8.1.5",
+      "resolved": "https://registry.npmjs.org/vite/-/vite-8.1.5.tgz",
+      "integrity": "sha512-7ULLwsCdYx/nRyrpiEwvqb5TFHrMVZyBt+rg/OAXT7rgj/z+DtTDyKFeLAdDkubDVDKD8jOsndmy7m55XcfUsw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "lightningcss": "^1.32.0",
+        "picomatch": "^4.0.5",
+        "postcss": "^8.5.17",
+        "rolldown": "~1.1.5",
+        "tinyglobby": "^0.2.17"
+      },
+      "bin": {
+        "vite": "bin/vite.js"
+      },
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      },
+      "funding": {
+        "url": "https://github.com/vitejs/vite?sponsor=1"
+      },
+      "optionalDependencies": {
+        "fsevents": "~2.3.3"
+      },
+      "peerDependencies": {
+        "@types/node": "^20.19.0 || >=22.12.0",
+        "@vitejs/devtools": "^0.3.0",
+        "esbuild": "^0.27.0 || ^0.28.0",
+        "jiti": ">=1.21.0",
+        "less": "^4.0.0",
+        "sass": "^1.70.0",
+        "sass-embedded": "^1.70.0",
+        "stylus": ">=0.54.8",
+        "sugarss": "^5.0.0",
+        "terser": "^5.16.0",
+        "tsx": "^4.8.1",
+        "yaml": "^2.4.2"
+      },
+      "peerDependenciesMeta": {
+        "@types/node": {
+          "optional": true
+        },
+        "@vitejs/devtools": {
+          "optional": true
+        },
+        "esbuild": {
+          "optional": true
+        },
+        "jiti": {
+          "optional": true
+        },
+        "less": {
+          "optional": true
+        },
+        "sass": {
+          "optional": true
+        },
+        "sass-embedded": {
+          "optional": true
+        },
+        "stylus": {
+          "optional": true
+        },
+        "sugarss": {
+          "optional": true
+        },
+        "terser": {
+          "optional": true
+        },
+        "tsx": {
+          "optional": true
+        },
+        "yaml": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/vitest": {
+      "version": "4.1.10",
+      "resolved": "https://registry.npmjs.org/vitest/-/vitest-4.1.10.tgz",
+      "integrity": "sha512-R9jUTe5S4Qb0HCd4TNqpC7oGcrMssMRGXLW80ubjWsW9VH5GF8y1Y0SFLY9AbqSk6nt0PnOx4H4WNJYZ13GUPw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@vitest/expect": "4.1.10",
+        "@vitest/mocker": "4.1.10",
+        "@vitest/pretty-format": "4.1.10",
+        "@vitest/runner": "4.1.10",
+        "@vitest/snapshot": "4.1.10",
+        "@vitest/spy": "4.1.10",
+        "@vitest/utils": "4.1.10",
+        "es-module-lexer": "^2.0.0",
+        "expect-type": "^1.3.0",
+        "magic-string": "^0.30.21",
+        "obug": "^2.1.1",
+        "pathe": "^2.0.3",
+        "picomatch": "^4.0.3",
+        "std-env": "^4.0.0-rc.1",
+        "tinybench": "^2.9.0",
+        "tinyexec": "^1.0.2",
+        "tinyglobby": "^0.2.15",
+        "tinyrainbow": "^3.1.0",
+        "vite": "^6.0.0 || ^7.0.0 || ^8.0.0",
+        "why-is-node-running": "^2.3.0"
+      },
+      "bin": {
+        "vitest": "vitest.mjs"
+      },
+      "engines": {
+        "node": "^20.0.0 || ^22.0.0 || >=24.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/vitest"
+      },
+      "peerDependencies": {
+        "@edge-runtime/vm": "*",
+        "@opentelemetry/api": "^1.9.0",
+        "@types/node": "^20.0.0 || ^22.0.0 || >=24.0.0",
+        "@vitest/browser-playwright": "4.1.10",
+        "@vitest/browser-preview": "4.1.10",
+        "@vitest/browser-webdriverio": "4.1.10",
+        "@vitest/coverage-istanbul": "4.1.10",
+        "@vitest/coverage-v8": "4.1.10",
+        "@vitest/ui": "4.1.10",
+        "happy-dom": "*",
+        "jsdom": "*",
+        "vite": "^6.0.0 || ^7.0.0 || ^8.0.0"
+      },
+      "peerDependenciesMeta": {
+        "@edge-runtime/vm": {
+          "optional": true
+        },
+        "@opentelemetry/api": {
+          "optional": true
+        },
+        "@types/node": {
+          "optional": true
+        },
+        "@vitest/browser-playwright": {
+          "optional": true
+        },
+        "@vitest/browser-preview": {
+          "optional": true
+        },
+        "@vitest/browser-webdriverio": {
+          "optional": true
+        },
+        "@vitest/coverage-istanbul": {
+          "optional": true
+        },
+        "@vitest/coverage-v8": {
+          "optional": true
+        },
+        "@vitest/ui": {
+          "optional": true
+        },
+        "happy-dom": {
+          "optional": true
+        },
+        "jsdom": {
+          "optional": true
+        },
+        "vite": {
+          "optional": false
+        }
+      }
+    },
     "node_modules/walker": {
       "version": "1.0.8",
       "resolved": "https://registry.npmjs.org/walker/-/walker-1.0.8.tgz",
@@ -5823,6 +8674,23 @@
         "node": ">= 8"
       }
     },
+    "node_modules/why-is-node-running": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/why-is-node-running/-/why-is-node-running-2.3.0.tgz",
+      "integrity": "sha512-hUrmaWBdVDcxvYqnyh09zunKzROWjbZTiNy8dBEjkS7ehEDQibXJ7XvlmtbwuTclUiIyN+CyXQD4Vmko8fNm8w==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "siginfo": "^2.0.0",
+        "stackback": "0.0.2"
+      },
+      "bin": {
+        "why-is-node-running": "cli.js"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/wrap-ansi": {
       "version": "8.1.0",
       "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-8.1.0.tgz",
@@ -5939,6 +8807,28 @@
         "node": "^14.17.0 || ^16.13.0 || >=18.0.0"
       }
     },
+    "node_modules/ws": {
+      "version": "8.21.1",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-8.21.1.tgz",
+      "integrity": "sha512-+0NTnW77fFN/DjQi6k/Sq/Yvk4Sgajw7urW8V+asjXnRgDs9gyGkdb7EzgfhA4goXsRIZKE28fzIXBHEzhuiWw==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=10.0.0"
+      },
+      "peerDependencies": {
+        "bufferutil": "^4.0.1",
+        "utf-8-validate": ">=5.0.2"
+      },
+      "peerDependenciesMeta": {
+        "bufferutil": {
+          "optional": true
+        },
+        "utf-8-validate": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/y18n": {
       "version": "5.0.8",
       "resolved": "https://registry.npmjs.org/y18n/-/y18n-5.0.8.tgz",
@@ -5957,9 +8847,9 @@
       "license": "ISC"
     },
     "node_modules/yargs": {
-      "version": "17.7.2",
-      "resolved": "https://registry.npmjs.org/yargs/-/yargs-17.7.2.tgz",
-      "integrity": "sha512-7dSzzRQ++CKnNI/krKnYRV7JKKPUXMEh61soaHKg9mrWEhzFWhFnxPxGl+69cD1Ou63C13NUPCnmIcrvqCuM6w==",
+      "version": "17.7.3",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-17.7.3.tgz",
+      "integrity": "sha512-GZtjxm/J/4TSxuL3FNYjCmLktBTnIw/rVmKSIyKeYAZpmJB2ig9VauCC5xsa82GNKVKDAqpOn3KVzNt0zmrU0g==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
@@ -6044,4 +8934,4 @@
       }
     }
   }
-}
\ No newline at end of file
+}
diff --git a/tests/package.json b/tests/package.json
index 13fac5cc..8347ab22 100644
--- a/tests/package.json
+++ b/tests/package.json
@@ -5,21 +5,26 @@
   "description": "Test suite for vscroll",
   "type": "module",
   "scripts": {
-    "test:unit": "jest",
-    "test:e2e": "playwright test --config=e2e/playwright.config.ts",
-    "test:e2e:ui": "playwright test --config=e2e/playwright.config.ts --ui",
-    "test:e2e:debug": "playwright test --config=e2e/playwright.config.ts --debug",
+    "test:unit": "jest --runInBand",
+    "test:unit:coverage": "jest --runInBand --coverage",
+    "test:e2e": "vitest run --config=e2e/vitest.config.ts",
+    "test:e2e:coverage": "vitest run --config=e2e/vitest.config.ts --coverage.enabled",
+    "test:e2e:ui": "vitest --config=e2e/vitest.config.ts --browser.headless=false",
     "test": "npm run test:unit && npm run test:e2e",
+    "test:coverage": "npm run test:unit:coverage && npm run test:e2e:coverage",
     "watch": "jest --watch"
   },
   "devDependencies": {
-    "@babel/core": "^7.28.5",
-    "@babel/preset-env": "^7.28.5",
-    "@babel/preset-typescript": "^7.28.5",
-    "@playwright/test": "^1.57.0",
+    "@babel/core": "^7.29.7",
+    "@babel/preset-env": "^7.29.7",
+    "@babel/preset-typescript": "^7.29.7",
     "@types/jest": "^30.0.0",
-    "babel-jest": "^30.2.0",
-    "jest": "^30.2.0",
-    "typescript": "^5.9.3"
+    "@vitest/browser-playwright": "^4.1.10",
+    "@vitest/coverage-istanbul": "^4.1.10",
+    "babel-jest": "^30.4.1",
+    "jest": "^30.4.2",
+    "playwright": "^1.61.1",
+    "typescript": "^5.9.3",
+    "vitest": "^4.1.10"
   }
-}
\ No newline at end of file
+}
diff --git a/tests/unit/adapter.spec.ts b/tests/unit/adapter.spec.ts
index 98779c83..6245cf11 100644
--- a/tests/unit/adapter.spec.ts
+++ b/tests/unit/adapter.spec.ts
@@ -1,7 +1,9 @@
 import { Scroller } from '../../src/scroller';
 import { AdapterPropName } from '../../src/classes/adapter/props';
-import { Datasource } from '../../src/classes/datasource';
+import { Datasource, makeDatasource } from '../../src/classes/datasource';
+import { Reactive } from '../../src/classes/reactive';
 import { wantedUtils } from '../../src/classes/adapter/wanted';
+import type { AdapterMethodResult, ProcessSubject } from '../../src/interfaces';
 import version from '../../src/version';
 
 const MOCK = {
@@ -19,6 +21,60 @@ const MOCK = {
   }
 };
 
+const createDatasource = () =>
+  new Datasource({
+    get: (_index: number, _count: number) => Promise.resolve([])
+  });
+
+const disposedResult: AdapterMethodResult = {
+  immediate: false,
+  success: false,
+  details: 'Adapter was disposed'
+};
+
+const createHost = () => {
+  const adapterRun$ = new Reactive<ProcessSubject>();
+  const datasource = createDatasource();
+  const scroller = new Scroller({
+    datasource,
+    element: MOCK.element,
+    workflow: {
+      onDataChanged: () => null,
+      call: process => adapterRun$.set(process)
+    }
+  });
+  scroller.viewport.reset = () => null;
+  scroller.init(adapterRun$);
+  scroller.state.cycle.busy.set(true);
+
+  let disposed = false;
+  return {
+    adapter: datasource.adapter,
+    dispose: () => {
+      if (disposed) {
+        return;
+      }
+      disposed = true;
+      adapterRun$.dispose();
+      scroller.dispose(true);
+      datasource.dispose();
+    }
+  };
+};
+
+const expectSettled = (
+  promise: Promise<AdapterMethodResult>
+): Promise<AdapterMethodResult> =>
+  Promise.race([
+    promise,
+    new Promise<never>((_resolve, reject) =>
+      setTimeout(
+        () => reject(new Error('Adapter promise did not settle on dispose')),
+        0
+      )
+    )
+  ]);
+
 describe('Adapter Init Spec', () => {
   const ds = new Datasource(MOCK.datasource);
 
@@ -33,6 +89,100 @@ describe('Adapter Init Spec', () => {
   });
 });
 
+describe('Adapter Custom Reactive Source Spec', () => {
+  it('should preserve the source and forward values across recreation', () => {
+    const source = {};
+    const values: unknown[] = [];
+    const CustomDatasource = makeDatasource(() => ({
+      mock: false,
+      reactive: {
+        [AdapterPropName.isLoading$]: {
+          source,
+          emit: (target, value) => {
+            expect(target).toBe(source);
+            values.push(value);
+          }
+        }
+      }
+    }));
+    const datasource = new CustomDatasource(MOCK.datasource);
+    const createScroller = () => {
+      const scroller = new Scroller({
+        datasource,
+        element: MOCK.element,
+        workflow: MOCK.workflow
+      });
+      scroller.viewport.reset = () => null;
+      scroller.init();
+      return scroller;
+    };
+    let scroller = createScroller();
+
+    try {
+      expect(datasource.adapter.isLoading$).toBe(source);
+      scroller.state.cycle.busy.set(true);
+      scroller.dispose(true);
+
+      scroller = createScroller();
+      expect(datasource.adapter.isLoading$).toBe(source);
+      scroller.state.cycle.busy.set(true);
+
+      expect(values).toEqual([true, false, true]);
+    } finally {
+      scroller.dispose(true);
+      datasource.dispose();
+    }
+  });
+});
+
+describe('Adapter Lifecycle Spec', () => {
+  describe('before initialization', () => {
+    test.each(['relax', 'reload', 'reset', 'check', 'clip'] as const)(
+      '%s resolves immediately',
+      async method => {
+        const datasource = createDatasource();
+        try {
+          await expect(datasource.adapter[method]()).resolves.toEqual({
+            immediate: true,
+            success: true,
+            details: 'Adapter is not initialized'
+          });
+        } finally {
+          datasource.dispose();
+        }
+      }
+    );
+  });
+
+  describe('on dispose', () => {
+    it('settles a pending relax without running its callback', async () => {
+      const host = createHost();
+      const callback = jest.fn();
+      try {
+        const result = host.adapter.relax(callback);
+        host.dispose();
+
+        await expect(expectSettled(result)).resolves.toEqual(disposedResult);
+        expect(callback).not.toHaveBeenCalled();
+      } finally {
+        host.dispose();
+      }
+    });
+
+    it('settles a pending workflow method', async () => {
+      const host = createHost();
+      try {
+        const result = host.adapter.check();
+        host.dispose();
+
+        await expect(expectSettled(result)).resolves.toEqual(disposedResult);
+      } finally {
+        host.dispose();
+      }
+    });
+  });
+});
+
 describe('Adapter Wanted Spec', () => {
   let scroller;
 
diff --git a/tests/unit/cache.spec.ts b/tests/unit/cache.spec.ts
index 101a9ef0..33bfd7e4 100644
--- a/tests/unit/cache.spec.ts
+++ b/tests/unit/cache.spec.ts
@@ -660,6 +660,17 @@ describe('Cache Spec', () => {
           Array.from({ length: 10 }).map((j, i) => ({ [100 + i]: 20 }))
         ));
 
+      it('should keep frequent size on a tie regardless of insertion order', () =>
+        checkDefaultSize({
+          sizeStrategy: SizeStrategy.Frequent,
+          cacheSize: 3,
+          itemSize: 12,
+          setItemSize: item => (item.size = item.$index === 1 ? 20 : 12),
+          updateCache: cache =>
+            cache.add({ $index: 4, size: 20, data: {} } as Item),
+          before: 12
+        }));
+
       it('should change frequent size on add (new, more)', () =>
         checkFrequentOnAdd(
           Array.from({ length: 11 }).map((j, i) => ({ [100 + i]: 20 })),
diff --git a/tests/unit/datasource-bad.spec.ts b/tests/unit/datasource-bad.spec.ts
index 8c54c7c5..6638879c 100644
--- a/tests/unit/datasource-bad.spec.ts
+++ b/tests/unit/datasource-bad.spec.ts
@@ -1,14 +1,10 @@
 import { INVALID_DATASOURCE_PREFIX, Scroller } from '../../src/scroller';
 
 describe('Wrong Datasource on Scroller instantiation', () => {
-  const checkScrollerError = (datasource, error) => {
-    try {
-      new Scroller({ datasource });
-    } catch (e) {
-      expect(e.message).toContain(INVALID_DATASOURCE_PREFIX);
-      expect(e.message).toContain(error);
-    }
-  };
+  const checkScrollerError = (datasource, error) =>
+    expect(() => new Scroller({ datasource })).toThrow(
+      `${INVALID_DATASOURCE_PREFIX} ${error}`
+    );
 
   it('should throw "get" must be set', () =>
     [void 0, null, 'wrong', {}, { get: void 0 }].forEach(ds =>
diff --git a/tests/unit/fetch.spec.ts b/tests/unit/fetch.spec.ts
new file mode 100644
index 00000000..e0030957
--- /dev/null
+++ b/tests/unit/fetch.spec.ts
@@ -0,0 +1,117 @@
+import { Scroller } from '../../src/scroller';
+import Fetch from '../../src/processes/fetch';
+import { CommonProcess, ProcessStatus } from '../../src/processes/misc';
+
+type Success = (data: unknown[]) => void;
+type Failure = (error: unknown) => void;
+type Get = (
+  index: number,
+  count: number,
+  success: Success,
+  fail: Failure
+) => unknown;
+
+interface ErrorSource {
+  get: Get;
+  release?: () => void;
+}
+
+const error = 0;
+
+const sources: Array<[string, () => ErrorSource]> = [
+  [
+    'synchronous callback',
+    () => ({
+      get: (_index, _count, _success, fail) => fail(error)
+    })
+  ],
+  [
+    'asynchronous callback',
+    () => {
+      let fail: Failure;
+      return {
+        get: (_index, _count, _success, onError) => {
+          fail = onError;
+        },
+        release: () => fail(error)
+      };
+    }
+  ],
+  [
+    'rejected Promise',
+    () => ({
+      get: () => Promise.reject(error)
+    })
+  ],
+  [
+    'synchronous Observable',
+    () => ({
+      get: () => ({
+        subscribe: (_success: Success, fail: Failure) => {
+          fail(error);
+          return { unsubscribe: () => null };
+        }
+      })
+    })
+  ],
+  [
+    'asynchronous Observable',
+    () => {
+      let fail: Failure;
+      return {
+        get: () => ({
+          subscribe: (_success: Success, onError: Failure) => {
+            fail = onError;
+            return { unsubscribe: () => null };
+          }
+        }),
+        release: () => fail(error)
+      };
+    }
+  ]
+];
+
+const createScroller = (get: Get) => {
+  const call = jest.fn();
+  const scroller = {
+    datasource: { get },
+    workflow: { call },
+    logger: { log: jest.fn() },
+    state: {
+      fetch: {
+        index: 1,
+        count: 2,
+        cancel: null
+      },
+      scroll: {
+        positionBeforeAsync: null
+      }
+    },
+    viewport: {
+      scrollPosition: 0
+    }
+  } as unknown as Scroller;
+
+  return { call, scroller };
+};
+
+describe('Datasource errors', () => {
+  test.each(sources)(
+    '%s produces one Fetch error',
+    async (_title, createSource) => {
+      const source = createSource();
+      const { call, scroller } = createScroller(source.get);
+
+      Fetch.run(scroller);
+      source.release?.();
+      await Promise.resolve();
+
+      expect(call).toHaveBeenCalledTimes(1);
+      expect(call).toHaveBeenCalledWith({
+        process: CommonProcess.fetch,
+        status: ProcessStatus.error,
+        payload: { error }
+      });
+    }
+  );
+});
diff --git a/tests/unit/reactive.spec.ts b/tests/unit/reactive.spec.ts
index 1b15351d..881e03f6 100644
--- a/tests/unit/reactive.spec.ts
+++ b/tests/unit/reactive.spec.ts
@@ -64,6 +64,20 @@ describe('Reactive', () => {
       expect($.get()).toEqual(VALUES[VALUES.length - 1]);
       expect(call).toEqual(1);
     });
+
+    it('should emit once when subscription emits immediately', () => {
+      const values: string[] = [];
+      const $ = new Reactive(VALUES[0], { emitOnSubscribe: true });
+
+      $.once(value => {
+        values.push(value);
+        $.set(VALUES[1]);
+      });
+      $.set(VALUES[2]);
+
+      expect(values).toEqual([VALUES[0]]);
+      expect($.get()).toBe(VALUES[2]);
+    });
   });
 
   describe('emitOnSubscribe', () => {