fix(engine): align reflection-mode data sources and hooks with source-gen by thomhurst · Pull Request #7094 · thomhurst/TUnit

thomhurst · 2026-10-17T15:41:02Z

Summary

tests/TUnit.UnitTests fails 4 tests on net10.0 with --reflection on main; they pass in source-gen mode. Each failure is a real reflection-mode bug, not a test that relies on source-gen behaviour. I found two more mode differences while reproducing them, and this PR fixes those too.

Root causes and fixes

Test / symptom	Root cause	Fix
`EmptyStaticDataSource_ShouldYieldOneEmptyResult`: `No members to generate were provided for TestParameters`	The reflection path of `MethodDataSourceAttribute.GetDataRowsAsync` threw when `MembersToGenerate` was empty. It is always empty for a parameterless test method.	Treat empty `MembersToGenerate` as valid.
`TestWithAsyncValueTaskDataSource`: `ValueTask<...> cannot be converted to Int32`	The reflection path handled `Task<T>`, `IAsyncEnumerable<T>` and `IEnumerable`, but not `ValueTask<T>`, so the result was passed to the test without being awaited.	Convert `ValueTask<T>` to `Task<T>` with `AsTask` (the `MethodInfo` is cached per type) and reuse the `Task` branch.
`GenericTestWithData<Int32>`: `String cannot be converted to Int32`	For each `[GenerateGenericTest]` type, the reflection collector closed the method and attached every `[Arguments]` row. The generator pairs each row with the instantiation inferred from it, so reflection made 4 tests where source-gen makes 2.	`ResolveMethodInstantiations` uses the generator's algorithm. Each `[Arguments]` row closes the method over the types inferred from its own values and runs only there. Each `[GenerateGenericTest]` type that no row inferred runs with every row. For example, `[GenerateGenericTest(typeof(long))] [Arguments(1)] [Arguments(2L)]` gives `<int>(1)` and `<long>(2)` in both modes.
`InitializeEntity` (+ dependent `CanSetCustomerName` skipped): `Late bound operations cannot be performed on types or methods for which ContainsGenericParameters is true`	`[Before(Class)]` on `RepositoryTestBase<T>` was invoked through the open-generic `MethodInfo`. The generated hook body binds the method to the closed base type of `context.ClassType`.	Hook delegates bind open-generic hook methods to the closed type in the class's inheritance chain, using `MethodBase.GetMethodFromHandle`, with a cache. Static hooks use the class from the hook context; instance hooks use the instance type. A static hook found on a constructed base (`Base<int>` reached from a derived class) is registered against the open definition, as source-gen does, so it runs once and not twice.
Reflection discovery found no tests and crashed with `SemaphoreSlim maxCount 0` when the checkout path contained `ref` or `runtimes` (e.g. `...\reflection-unittests\`)	`ShouldScanAssembly` used `location.Contains("ref")`. With zero assemblies, `new SemaphoreSlim(0, 0)` throws.	Match whole directory names. Also clamp the concurrency to at least 1.
`EmptyStaticDataSource_ShouldYieldOneEmptyResult` did not exist in source-gen mode	An empty `[MethodDataSource]` without `SkipIfEmpty` yields one empty row in reflection mode, so the test runs once with no arguments (#2862). The source-generated `Factory` path yielded no rows, so the test was never created.	Owner decision in #7092: both modes run the test once with no arguments. `GetDataRowsAsync` now yields one empty row after an empty `Factory` enumeration unless `SkipIfEmpty` is set. This is a `TUnit.Core` change, so generator output is unchanged.
Source-gen: `[MethodDataSource(..., SkipIfEmpty = true)]` with an empty source made the test disappear instead of being reported as skipped	The generator's `MethodDataSourceAttribute` emission dropped `SkipIfEmpty`.	Emit `SkipIfEmpty = true`, the same way `DeferEnumeration` is emitted.

AOT and trimming: every change except the generator change is in reflection-only paths. The new reflection is annotated or suppressed in the same way as the code around it. TUnit.Core and TUnit.Engine build with the trim analyzers and produce no warnings. I could not run an AOT publish locally because this machine has no native linker; CI covers AOT through TUnit.Engine.Tests.

Tests

New fixtures in tests/TUnit.TestProject/Bugs/_7092 ([EngineTest(ExpectedResult.Pass)]), one per shape. tests/TUnit.Engine.Tests/Issue7092Tests.cs runs them in both Reflection and AOT modes.

New generator snapshot Tests7092 checks that SkipIfEmpty = true is emitted.
New ReflectionAssemblyLocationFilterTests in TUnit.UnitTests covers the path filter.

Local results (Windows, net10.0):

TUnit.UnitTests, source-gen: 538 total, 0 failed (537 before the empty-source change, because EmptyStaticDataSource_ShouldYieldOneEmptyResult was missing).
TUnit.UnitTests, --reflection: 538 total, 0 failed. It was 532 total with 4 failed on main.
The Bugs._7092 fixtures, run directly in both modes: all pass. The SkipIfEmpty fixture is reported as 1 skipped in both modes.
TestProject [EngineTest=Pass] tests, source-gen mode: 5968 total, 0 failed. Reflection mode: 5955 total, 0 failed.
TUnit.Engine.Tests Issue7092Tests: Reflection mode passes. The AOT cases skip locally.
Related TUnit.Engine.Tests classes all pass in Reflection mode: hook classes, DataSourceCountTests, DataSourceExceptionPropagationTests, GenericMethodWithDataSourceTests, DeferEnumerationTests, SkipTests and others.
TUnit.Core.SourceGenerator.Tests: all 186 pass on net10.0. The new snapshot also passes on net8.0 and net472.

Behaviour change for source-gen users

A test with an empty [MethodDataSource] and no SkipIfEmpty now runs once with no arguments in source-gen mode, as it already did in reflection mode. Before this change the test was not created at all. If the test method has parameters, that run fails with an argument-count error, which is the same result reflection mode already gives. Set SkipIfEmpty = true to report the test as skipped instead.

Review follow-ups

Generic-base class hooks ran twice in reflection mode: fixed, and the fixture now asserts an exact run count.
[GenerateGenericTest] row pairing now matches source-gen output, including rows such as an int literal on a <long> instantiation. The compatibility filter is gone.
Reflection also infers instantiations from typed data sources (DataSourceGeneratorAttribute<T>, AsyncDataSourceGeneratorAttribute<T>) and from IInfersType<T> parameter attributes such as Matrix<T>, as source-gen does. A [GenerateGenericTest] type that any of these already produced is not repeated. So is inference from a [MethodDataSource] returning IEnumerable<Func<(...)>>. Tuple types are flattened through TRest, so eight or more elements infer correctly. Rows whose inferred types violate constraints are skipped, as the generator does today; fix(engine): substitute class type arguments and array element types in build-time constraint checks #7102 changes the generator to report them as failures, and reflection will need the same change once it merges.
Rows whose values suggest conflicting types ([Arguments("x", 1)] on Test<T>(T, T)) take the last type in both modes. That is existing source-gen behaviour, so I left it unchanged.
Known source-gen gaps, older than this PR and left for follow-up: when several rows infer the same type, only the first runs ([Arguments(1)] [Arguments(2)] Test<T>(T) gives only Test<int>(1)). params T[] with [GenerateGenericTest] does not compile (CS0246).

Summary by CodeRabbit

Bug Fixes
- Empty method data sources now run parameterless tests once by default, or are skipped when SkipIfEmpty is enabled.
- ValueTask-based data sources are awaited correctly.
- Generic tests now match data rows and typed data sources to inferred types, while retaining rows for explicitly generated types.
- Hooks on generic base classes run for the appropriate closed type without duplicate static registration.
- Assembly discovery more accurately excludes framework directories, avoiding false matches from partial directory names.

…-gen - MethodDataSource no longer throws for parameterless test methods in reflection mode. - Reflection-mode MethodDataSource awaits ValueTask<T> results. - Arguments rows on a GenerateGenericTest-closed method are kept only for the instantiation their values fit, as the generator does. - Static and instance hooks declared on open generic base classes are bound to the closed type before invocation. - Assembly location filtering matches whole directory names, so paths containing "ref" or "runtimes" no longer hide every test assembly; zero scannable assemblies no longer crash discovery. - The source generator now emits SkipIfEmpty on MethodDataSource. Fixes #7092

chatgpt-codex-connector · 2026-10-17T15:41:15Z

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📝 Walkthrough

Reflection discovery now handles empty and asynchronous method data sources, infers generic test types from data sources and argument rows, binds generic base hooks to closed types, and filters assembly paths by directory name. Generated method data-source attributes retain SkipIfEmpty = true.

Changes: Reflection and Data-Source Discovery

Layer / File(s)	Summary
Method data-source handling `src/TUnit.Core/Attributes/TestData/MethodDataSourceAttribute.cs`, `src/TUnit.Core.SourceGenerator/Generators/TestMetadataGenerator.cs`, `tests/TUnit.Core.SourceGenerator.Tests/Bugs/7092/*`, `tests/TUnit.Core.SourceGenerator.Tests/Tests7092.Test.verified.txt`, `tests/TUnit.TestProject/Bugs/_7092/SkipIfEmptyMethodDataSourceTests.cs`, `tests/TUnit.TestProject/Bugs/_7092/EmptyMethodDataSourceTests.cs`, `tests/TUnit.TestProject/Bugs/_7092/ReflectionModeParityTests.cs`, `tests/TUnit.Engine.Tests/Issue7092Tests.cs`, `tests/TUnit.UnitTests/EmptyDataSourceTests.cs`	Reflection method data sources support parameterless methods, generic `ValueTask` results, and an empty argument row unless `SkipIfEmpty` is true. Generated attributes retain `SkipIfEmpty = true`. Regression tests cover empty sources, asynchronous sources, and skip behavior.
Generic argument-row inference `src/TUnit.Engine/Discovery/ReflectionTestDataCollector.cs`, `tests/TUnit.TestProject/Bugs/_7092/ReflectionModeParityTests.cs`, `tests/TUnit.TestProject/Bugs/_7092/GenerateGenericTest*Tests.cs`, `tests/TUnit.Engine.Tests/Issue7092Tests.cs`	Reflection discovery infers method type arguments from argument rows, typed data sources, method data sources, and parameter attributes. It associates applicable sources with each instantiation and avoids duplicate inferred types. Tests cover type inference and row pairing.
Generic base hook binding `src/TUnit.Engine/Discovery/ReflectionHookDiscoveryService.cs`, `tests/TUnit.TestProject/Bugs/_7092/ReflectionModeParityTests.cs`, `tests/TUnit.Engine.Tests/Issue7092Tests.cs`	Static hooks on constructed generic bases register against open definitions. Hook delegates resolve open generic methods against matching closed types before invocation.
Assembly location filtering `src/TUnit.Engine/Discovery/ReflectionTestDataCollector.cs`, `tests/TUnit.UnitTests/ReflectionAssemblyLocationFilterTests.cs`	Assembly filtering checks exact ancestor-directory names, ignoring case, instead of matching directory-name substrings. Assembly-scan concurrency is clamped to at least one. Tests cover matching and non-matching directory names.

Priority: ➖ Normal

Estimated code review effort: 4 (Complex) | ~45 minutes

Change: Bug fix · Severity of issue fixed: Medium

Sequence Diagram(s)

sequenceDiagram
  participant ReflectionTestDataCollector
  participant GenericInference
  participant DataSources
  participant TestMetadata
  ReflectionTestDataCollector->>GenericInference: resolve generic method instantiations
  GenericInference->>DataSources: infer types and applicable rows
  DataSources-->>GenericInference: type arguments and rows
  GenericInference-->>ReflectionTestDataCollector: concrete methods and source associations
  ReflectionTestDataCollector->>TestMetadata: build metadata with applicable data sources

Merge Risk: 🔵 Low · up to 5a2a1

Unusual argument rows or same-named provider methods may cause incorrect generic test instantiation or failures. These bounded cases warrant owner awareness, but do not appear to block merging.

Pre-merge checks: 4 · 1

Failed checks: 1 warning

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 35.71% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 70 functions across 15 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

Passed checks: 4 passed

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly and concisely describes the main objective: aligning reflection-mode data sources and hooks with source-generated behavior. It is specific, relevant, and suitable for repository hist…
Linked Issues check		Issue `#7092` is the active direct target. The reviewed changes address its coding requirements for parameterless `MethodDataSource`, `ValueTask<T>` data sources, generic argument-row pairing and infere…
Out of Scope Changes check		The production changes remain connected to issue `#7092`. The core changes implement data-source parity, the engine changes implement reflection discovery and generic and hook behavior, and the generato…

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Explanation

The title clearly and concisely describes the main objective: aligning reflection-mode data sources and hooks with source-generated behavior. It is specific, relevant, and suitable for repository history.

Full details: Linked Issues check

Explanation

Issue #7092 is the active direct target. The reviewed changes address its coding requirements for parameterless MethodDataSource, ValueTask<T> data sources, generic argument-row pairing and inference, open-generic hooks, assembly-path filtering, discovery concurrency, and generated SkipIfEmpty. The changes also align empty-source behavior across reflection and source generation. Focused regression tests cover these behaviors, including tuple and typed-source inference. The supplied results report passing source-generation, reflection, and focused engine tests.

Full details: Out of Scope Changes check

Explanation

The production changes remain connected to issue #7092. The core changes implement data-source parity, the engine changes implement reflection discovery and generic and hook behavior, and the generator change preserves SkipIfEmpty. The added fixtures, snapshot, and unit tests verify these objectives. No unrelated change is established by the available evidence.

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greptile-apps · 2026-10-17T15:48:03Z

Confidence Score: 5/5

[Medium impact] The PR appears safe to merge; no new blocking issue was found.

Summary

Aligns reflection-mode data sources and generic hooks with source-generated tests.

Generic test rows run with the types their data sources infer.
Method data sources handle empty rows, parameterless tests, and ValueTask results consistently.
Hooks on generic base classes run on the matching closed type.
Reflection discovery filters framework paths by whole directory name.

No new actionable issues found. All seven supplied previous threads were unnumbered; their reported fixes are present.

thomhurst explicitly left constraint-error reporting, older source-gen repeated-row behavior, and params T[] compilation for follow-up. thomhurst also retained last-value inference for conflicting types and declined to copy source-gen's mistyped cross-row behavior on generic classes.

Tests were inspected, not run.

Diagram

%%{init: {'theme': 'neutral'}}%%
flowchart TD
  A[Generic test method] --> B[Infer types from sources]
  B --> C[Close method and select its source rows]
  A --> D[Explicit generated types]
  D --> E{Already inferred?}
  E -->|Yes| F[Skip duplicate instantiation]
  E -->|No| G[Run all method sources]
  C --> H[Build test metadata]
  G --> H

_{Reviews (10) · Last reviewed commit: "Merge remote-tracking branch 'origin/mai..." · Reviewed by Greptile}

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Review comments at @src/TUnit.Engine/Discovery/ReflectionAttributeExtractor.cs:
- Around line 281-284: In ReflectionAttributeExtractor, validate supplied values
for T[] parameters against each closed array element type before returning on a
values.Length and closedParameters.Length mismatch; discard incompatible rows
when any compatible row exists, while preserving the fallback that retains all
rows when none are compatible. Add a regression with mixed array-bound rows and
verify reflection and source-generated modes produce the same result.

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- Around line 995-997: Update hook discovery around CloseOpenGenericHookMethod
so each closed test class has only one registration per generic-base class hook.
Deduplicate the open-definition and constructed-base registrations using a key
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src/TUnit.Core.SourceGenerator/Generators/TestMetadataGenerator.cs
src/TUnit.Core/Attributes/TestData/MethodDataSourceAttribute.cs
src/TUnit.Engine/Discovery/ReflectionAttributeExtractor.cs
src/TUnit.Engine/Discovery/ReflectionHookDiscoveryService.cs
src/TUnit.Engine/Discovery/ReflectionTestDataCollector.cs
tests/TUnit.Core.SourceGenerator.Tests/Bugs/7092/Tests7092.cs
tests/TUnit.Core.SourceGenerator.Tests/Tests7092.Test.verified.txt
tests/TUnit.Engine.Tests/Issue7092Tests.cs
tests/TUnit.TestProject/Bugs/_7092/ReflectionModeParityTests.cs
tests/TUnit.TestProject/Bugs/_7092/SkipIfEmptyMethodDataSourceTests.cs
tests/TUnit.UnitTests/ReflectionAssemblyLocationFilterTests.cs

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github-actions · 2026-10-17T16:02:23Z

Review of #7094

I read the diff but did not build the PR or run any tests. Each fix targets a root cause, and the PR description lines it up with the failing tests. The pieces I looked at were the SkipIfEmpty generator change, the ValueTask<T> handling, the generic-argument filtering, the open-generic hook binding, and the assembly-location matching.

I found nothing blocking. These are suggestions:

Generic-argument filtering (ReflectionAttributeExtractor.FilterArgumentsForClosedGenericMethod). It approximates the generator's type inference with IsInstanceOfType on the boxed value. This could diverge from the generator in edge cases, for example Test<long> with [Arguments(5)], where the generator infers int. The fallback of keeping all rows when none fit is a sensible safety net. Consider adding a reflection-mode test for a mixed-type case, such as int, string and a null row. That would pin the parity with the source-gen output.
Open-generic hook binding. The change is correct. CloseOpenGenericHookMethod caches per (method, classType), so the lookup cost is paid once. MethodBase.GetMethodFromHandle is AOT-safe. Both hook delegate paths use the same helper, which is good. The helper falls back to the original method when no closed match exists, so the original error still shows. A comment saying that this fallback is intentional would help.
ValueTask<T> conversion. The AsTask lookup is cached per type, which is fine. Because the reflection path calls Invoke, a TargetInvocationException could wrap any exception the source throws. Check that the surrounding code already unwraps it, as it does for the Task branch.
Assembly-location check. Matching whole directory names is clearly better than the old Contains("ref") substring test. The test coverage for the new method covers this.
SkipIfEmpty in the generator. Emitting it keeps source-gen consistent with reflection mode. The new snapshot test covers it.

The Math.Max(1, …) guard on the concurrency count is a good defensive fix.

Overall the PR looks good.

…with inferred types Reflection hook discovery registered a static hook on Base<T> for both the open definition and each constructed base reached through a derived class, so once the open copy was bound to the closed type the hook ran twice. Static hooks on constructed generic bases now register against the open definition, as the source generator does. For [GenerateGenericTest] methods with [Arguments], reflection mode now mirrors the generator: each row closes the method over the types inferred from its own values, and [GenerateGenericTest] types that no row inferred run with every row. This replaces the row compatibility filter, which dropped rows such as an int literal on a <long> instantiation.

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Inline comments:
Review comments at @src/TUnit.Engine/Discovery/ReflectionTestDataCollector.cs:
- Around line 1457-1467: Update generic type inference in both the reflection
collector and source generator to reject conflicting inferred types for the same
generic parameter: compare each new inference with the existing one and return
null on a mismatch; retain the existing assignment behavior when they match or
no prior inference exists. Locate the reflection logic in the loop using
typeArguments and the source-generator logic using inferredTypes.

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…gen mode An empty [MethodDataSource] without SkipIfEmpty runs the test once with no arguments, as NoDataSource does (#2862). The reflection path already did this, but the source-generated Factory path yielded no rows, so in source-gen mode the test did not exist. Apply the same rule after the Factory enumeration so both modes agree.

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only still-valid issues, skip the rest with a brief reason, keep changes
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Inline comments:
Review comments at
@src/TUnit.Core/Attributes/TestData/MethodDataSourceAttribute.cs:
- Around line 160-172: Update the PR description to state that an empty
source-generated MethodDataSource runs the test once with no arguments when
SkipIfEmpty is false, matching reflection mode. Preserve the implementation and
do not revert this behavior.

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With [GenerateGenericTest], reflection mode inferred instantiations only from [Arguments] rows. The source generator also infers them from typed data sources (DataSourceGeneratorAttribute<T> and AsyncDataSourceGeneratorAttribute<T>) and from IInfersType<T> parameter attributes, and it skips the [GenerateGenericTest] entry for any type a data source already produced. Reflection mode now does the same, so a typed source's rows no longer disappear and a covered type no longer runs twice.

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Comment thread src/TUnit.Engine/Discovery/ReflectionHookDiscoveryService.cs Resolved

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Comment thread src/TUnit.Engine/Discovery/ReflectionAttributeExtractor.cs Resolved

Comment thread src/TUnit.Engine/Discovery/ReflectionHookDiscoveryService.cs Resolved

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Comment thread src/TUnit.Engine/Discovery/ReflectionAttributeExtractor.cs Resolved

Comment thread src/TUnit.Engine/Discovery/ReflectionHookDiscoveryService.cs Resolved

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Reflection mode: TUnit.UnitTests fails 4 tests that pass in source-gen mode #7092

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Source-gen: generic method runs only the first [Arguments] row per inferred type #7096

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test(engine): cover Matrix<T> generic inference parity for #7092

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Confidence Score: 5/5

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coderabbitai Bot commented Oct 17, 2026 •

edited

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greptile-apps Bot commented Oct 17, 2026 •

edited

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