feat: Add Testcontainers.TUnit package - #1767
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Add a TUnit counterpart to the Testcontainers.Xunit and Testcontainers.XunitV3 packages. The base classes ContainerTest, ContainerFixture, DbContainerTest and DbContainerFixture implement TUnit's IAsyncInitializer and IAsyncDisposable, so TUnit starts the container before a test runs and disposes of it when the owning scope ends. Fixtures are injected with ClassDataSource and support all TUnit sharing scopes. Container startup honors the test's cancellation token, and log messages are written to the output of the test that is current at log time. The package references TUnit.Core, which is the package intended for libraries that provide TUnit infrastructure without the test runner.
On the .NET 10 SDK, dotnet test refuses to run Microsoft.Testing.Platform test projects (such as TUnit) through VSTest. The Cake Test task now detects projects that set TestingPlatformDotnetTestSupport and runs them with dotnet run, passing the platform's equivalents of the VSTest options: TRX report, code coverage, results directory and test filter. The coverage is produced in the Visual Studio coverage XML format, which the Sonar scanner picks up in addition to OpenCover.
Port the Redis and PostgreSQL examples of the xUnit.net test projects to TUnit. The shared Redis example injects the fixture with ClassDataSource and orders the dependent test with DependsOn, and the PostgreSQL example uses the injected CancellationToken.
The xUnit.net module test projects exercise the Testcontainers.Xunit base classes as a side effect, which Testcontainers.TUnit does not benefit from. Add a shared PostgreSQL fixture example that uses every ADO.NET helper method, a test for the remaining DbContainerTest helpers, and a test for the postponed start exception.
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Included review availability: Your plan provides up to 8 included reviews per hour; 5 remain after this review. WalkthroughAdds ChangesTUnit support
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~45 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant TUnit
participant ContainerTest
participant ContainerLifetime
participant TestContextLogger
participant TestContainer
TUnit->>ContainerTest: Create test instance
TUnit->>ContainerLifetime: InitializeAsync()
ContainerLifetime->>TestContainer: StartAsync(cancellationToken)
TestContainer->>TestContextLogger: Emit container logs
TUnit->>ContainerTest: Execute test
TUnit->>ContainerLifetime: DisposeAsync()
ContainerLifetime->>TestContainer: DisposeAsync()
Merge Risk: ⚪ Minimal · up to The supplied evidence identifies no unresolved behavior that would block publishing the TUnit integration package. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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In `@docs/test_frameworks/tunit.md`:
- Line 24: Update the guidance wording: change “may pointing” to “can point to”
and hyphenate “timed out test” as “timed-out test.”
- Line 90: Indent each ADO.NET C# code fence and its included snippet content by
four spaces beneath the corresponding === tab headers in the TUnit
documentation, covering all six tab sections and preserving the existing code
and tab structure.
In `@src/Testcontainers.TUnit/ContainerLifetime.cs`:
- Around line 81-84: Update InitializeAsync so the execution cancellationToken
is declared before the try block, then rethrow OperationCanceledException when
that token is canceled; continue capturing other startup exceptions in
_exception for deferred reporting.
- Around line 88-91: Update ContainerLifetime.DisposeAsyncCore to dispose the
lazy container whenever _container.IsValueCreated is true, regardless of
_exception; dispose _container.Value directly with ConfigureAwait(false) so
startup failures still release the container and attached resources without
accessing the exception-throwing Container property.
In `@src/Testcontainers.TUnit/DbContainerTestMethods.cs`:
- Line 15: Synchronize lazy initialization in the getter containing
_dbDataSource and _dbProviderFactory.CreateDataSource so concurrent helper calls
cannot create or overwrite multiple data-source instances. Use
Lazy<DbDataSource> or equivalent locking, while preserving the existing
connection-string and provider-factory initialization behavior.
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.github/scripts/Filter-TestProjects.ps1Directory.Packages.propsTestcontainers.slnxbuild/Tasks.csbuild/Usings.csdocs/test_frameworks/tunit.mdmkdocs.ymlsrc/Testcontainers.TUnit/.editorconfigsrc/Testcontainers.TUnit/ContainerFixture.cssrc/Testcontainers.TUnit/ContainerLifetime.cssrc/Testcontainers.TUnit/ContainerTest.cssrc/Testcontainers.TUnit/DbContainerFixture.cssrc/Testcontainers.TUnit/DbContainerTest.cssrc/Testcontainers.TUnit/DbContainerTestMethods.cssrc/Testcontainers.TUnit/IDbContainerTestMethods.cssrc/Testcontainers.TUnit/Logger.cssrc/Testcontainers.TUnit/NullScope.cssrc/Testcontainers.TUnit/TestContextLogger.cssrc/Testcontainers.TUnit/Testcontainers.TUnit.csprojsrc/Testcontainers.TUnit/Usings.cstests/Testcontainers.TUnit.Tests/.editorconfigtests/Testcontainers.TUnit.Tests/.runs-ontests/Testcontainers.TUnit.Tests/ContainerStartFailureTest.cstests/Testcontainers.TUnit.Tests/PostgreSqlContainer.cstests/Testcontainers.TUnit.Tests/PostgreSqlContainerFixture.cstests/Testcontainers.TUnit.Tests/RedisContainerTest1.cs`tests/Testcontainers.TUnit.Tests/RedisContainerTest2.cs`tests/Testcontainers.TUnit.Tests/Testcontainers.TUnit.Tests.csprojtests/Testcontainers.TUnit.Tests/Usings.cs
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The database test project references every test project to discover container implementations. Referencing the TUnit test project pulls TUnit's global usings into the xUnit.net project and makes Assert and Assembly ambiguous. Exclude it like the xUnit.net example projects.
…ontainers.TUnit A cancellation requested by TUnit while the container starts is now propagated instead of being postponed like other start failures, so the test is reported as canceled. A container that was created but failed to start is disposed of when the owning scope ends instead of being left to the resource reaper. The ADO.NET data source is created through a thread-safe Lazy<T>, because TUnit runs tests that share a fixture in parallel. Internal members are documented.
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@HofmeisterAn The remaining CI failure is unrelated to this PR: the The same tag the module pins, |
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One idea that came out of the Minio failure, for a separate PR if it is of interest: a small CI job that runs |
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What does this PR do?
Adds a
Testcontainers.TUnitpackage, the TUnit counterpart toTestcontainers.XunitandTestcontainers.XunitV3, together with a test project, documentation, and the build changes needed to run it in CI.The package deliberately follows the design of the existing xUnit.net test framework packages: the same class names, the same lifecycle semantics, the same ADO.NET helpers, and the same example tests and documentation structure. Anyone familiar with
Testcontainers.Xunitshould be able to read the TUnit package without learning a new model. Where the two differ, it is because TUnit offers a native mechanism (class data sources,[DependsOn], ambient test context) for something xUnit.net needs a sink, an orderer, or an extension for.Package. The public surface mirrors the xUnit.net packages:
ContainerTest,ContainerFixture,DbContainerTest, andDbContainerFixture, built on a sharedContainerLifetimebase class.ContainerLifetimeimplements TUnit'sIAsyncInitializerandIAsyncDisposable. TUnit starts the container before a test runs and disposes of it when the owning scope ends. As in the xUnit.net packages, a start failure is captured and rethrown onContaineraccess so the test fails with the actual cause.ContainerTestgives each test its own container, because TUnit creates a new test class instance per test.ContainerFixtureis injected with[ClassDataSource<TFixture>]and supports everySharedType(per class, per assembly, per test session, keyed) without extra attributes or extensions.TestContext.Current.Execution.CancellationToken, matching the xUnit.net v3 behavior from feat: Allow canceling container start in xUnit.net v3 fixtures #1431.[ClassDataSource<...>]properties (for example a network or a dependent container) and use them insideConfigure(). This is documented in the guide.Configure()is abstract. The obsoleteConfigure(TBuilderEntity)overload and theconfigureconstructor callback from the xUnit.net packages are not carried over, since parameterless module builders are obsolete as well (feat: Require explicit container image in Testcontainers.Xunit #1612).TUnit.Core1.68.4, the package intended for libraries that provide TUnit infrastructure without the runner. The source generator, polyfills, and implicit usings are disabled for the library. Target frameworks match the xUnit.net packages.DbContainerTestMethods,IDbContainerTestMethods,Logger,NullScope) are copied rather than shared, because the xUnit.net sources are bound to theTestcontainers.Xunitnamespace andTestcontainers.XunitV3already relies on compiling them as they are.Tests.
tests/Testcontainers.TUnit.Testsports the Redis and PostgreSQL examples of the xUnit.net test project. The shared Redis example orders the dependent test with[DependsOn]instead of a custom test case orderer, and the PostgreSQL example uses the injectedCancellationToken. Since the xUnit.net module tests exercise the xUnit.net base classes as a side effect and the TUnit package does not benefit from that, the project also contains a shared PostgreSQLDbContainerFixtureexample that uses every ADO.NET helper method, and a test for the postponed start exception. 16 tests, about 90% block coverage of the library.Build. On the .NET 10 SDK,
dotnet testrefuses to run Microsoft.Testing.Platform projects through VSTest. The CakeTesttask now detects projects that setTestingPlatformDotnetTestSupport(TUnit sets it totrue, xunit.v3 sets it tofalse) and runs them withdotnet run, passing the platform's equivalents of the VSTest options: TRX report, code coverage, results directory, and test filter. Coverage is produced in the Visual Studio coverage XML format, andsonar.cs.vscoveragexml.reportsPathsis added next to the existing OpenCover path. The xUnit.net projects are unaffected and still run through VSTest.Docs. A
Testing with TUnitguide is added next to the xUnit.net guide, built from the same snippet markers in the test project. Package versions are managed centrally and the test project is registered for CI via.runs-onand the database module filter.Why is it important?
TUnit is increasingly used for integration tests and has first-class support for shared, asynchronously initialized fixtures, which is exactly the pattern the xUnit.net packages exist for. Without a package, TUnit users have to hand-roll the lifetime management, the ADO.NET helpers, and the log forwarding that
Testcontainers.Xunitalready provides. Modeling the new package on the xUnit.net one keeps the two consistent for users who maintain tests in both frameworks, and keeps the maintenance surface familiar for the project.Related issues
How to test this PR
The
Testtarget writesTestcontainers.TUnit.Tests.trxandTestcontainers.TUnit.Tests.coverage.xmltotest-results. To confirm the VSTest path is unchanged, run the same two targets with--test-project=Testcontainers.XunitV3and check thatcoverage.opencover.xmlis still produced.The package can be inspected with
dotnet pack src/Testcontainers.TUnit -c Release. Its only dependencies areTestcontainersandTUnit.Core.Follow-ups
--blame-hang-timeoutsafeguard has no direct Microsoft.Testing.Platform equivalent and is not applied to platform projects. The TUnit test project only runs on the Linux runner, where hangs have not been an issue.Summary by CodeRabbit