diff --git a/tests/unit/learn_test.sh b/tests/unit/learn_test.sh
new file mode 100644
index 00000000..80d470bb
--- /dev/null
+++ b/tests/unit/learn_test.sh
@@ -0,0 +1,91 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# src/learn.sh had no tests at all. These cover its non-interactive core: the
+# progress persistence and the environment lifecycle. LEARN_PROGRESS_FILE is a
+# readonly resolved from $HOME at source time, so each test sources learn.sh in
+# a fresh shell with HOME pointed at an isolated directory — the suite's own
+# already-sourced copy (bound to the real $HOME) is never exercised.
+
+# Runs a snippet against a freshly-sourced learn.sh inside an isolated HOME/CWD.
+function _learn_in_sandbox() {
+  local sandbox root_dir
+  sandbox="$(bashunit::temp_dir)"
+  # BASHUNIT_ROOT_DIR may be relative (e.g. "."); resolve it before cd-ing away.
+  root_dir="$(cd "$BASHUNIT_ROOT_DIR" && pwd)"
+  (
+    cd "$sandbox" &&
+      HOME="$sandbox" bash -c '
+        set -euo pipefail
+        GREP="$(command -v grep)"
+        # shellcheck source=/dev/null
+        source "'"$root_dir"'/src/learn.sh"
+        '"$1"'
+      '
+  )
+}
+
+function test_learn_mark_completed_then_is_completed() {
+  local out
+  out="$(_learn_in_sandbox '
+    bashunit::learn::mark_completed "lesson_3"
+    if bashunit::learn::is_completed "lesson_3"; then echo tracked; fi
+  ')"
+
+  assert_same "tracked" "$out"
+}
+
+function test_learn_is_completed_is_exact_lesson_match() {
+  local out
+  out="$(_learn_in_sandbox '
+    bashunit::learn::mark_completed "lesson_1"
+    if ! bashunit::learn::is_completed "lesson_10"; then echo distinct; fi
+  ')"
+
+  assert_same "distinct" "$out"
+}
+
+function test_learn_is_completed_without_progress_file() {
+  local out
+  out="$(_learn_in_sandbox '
+    if ! bashunit::learn::is_completed "lesson_1"; then echo untracked; fi
+  ')"
+
+  assert_same "untracked" "$out"
+}
+
+function test_learn_mark_completed_accumulates_lessons() {
+  local out
+  out="$(_learn_in_sandbox '
+    bashunit::learn::mark_completed "lesson_1"
+    bashunit::learn::mark_completed "lesson_2"
+    if bashunit::learn::is_completed "lesson_1" &&
+      bashunit::learn::is_completed "lesson_2"; then echo both; fi
+  ')"
+
+  assert_same "both" "$out"
+}
+
+function test_learn_init_creates_workspace_and_cleanup_removes_it() {
+  local out
+  out="$(_learn_in_sandbox '
+    bashunit::learn::init
+    [ -d "$LEARN_TEMP_DIR" ] && echo "workspace"
+    [ -d tests ] && echo "tests-dir"
+    dir="$LEARN_TEMP_DIR"
+    bashunit::learn::cleanup
+    [ ! -d "$dir" ] && echo "cleaned"
+  ')"
+
+  assert_same $'workspace\ntests-dir\ncleaned' "$out"
+}
+
+function test_learn_cleanup_is_safe_without_init() {
+  local out
+  out="$(_learn_in_sandbox '
+    bashunit::learn::cleanup
+    echo "safe"
+  ')"
+
+  assert_same "safe" "$out"
+}