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feat!: add TestFiltering hooks and test exclude/skip/order APIs (#4788) - #7071
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📝 Walkthrough
Merge Risk: 🔵 Low · up to
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| Check name | Status | Explanation | Resolution |
|---|---|---|---|
| Docstring Coverage |  |
Docstring coverage is 18.89% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 217 functions across 48 files. (1 skipped… | Write docstrings for the functions missing them to satisfy the coverage threshold. |
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Check name Status Explanation Description Check Check skipped - CodeRabbit’s high-level summary is enabled. Title check The title clearly summarizes the main changes: adding TestFiltering hooks and APIs to exclude, skip, and order tests. Linked Issues check Issue #4788requires test-selection APIs and a hook stage after framework filtering and before the test session. The PR addsExcludeTests,SkipTests, and stableOrderTestsByto `TestDiscoveryCon…Out of Scope Changes check The changes support issue #4788. They include lifecycle implementation, public contexts and APIs, scheduler integration, source-generator and reflection support, analyzer and API snapshot updates, doc…Full details: Linked Issues check
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Explanation
Issue
#4788requires test-selection APIs and a hook stage after framework filtering and before the test session. The PR addsExcludeTests,SkipTests, and stableOrderTestsBytoTestDiscoveryContextandTestFilteringContext. It adds[Before/After(TestFiltering)]support in the source-generator and reflection paths. The implementation applies discovery hooks, framework filtering, filtering hooks, dependency handling, and final registration in the required lifecycle.[After(TestFiltering)]is read-only, discovery exclusions affect listing, and no-hook runs skip the stage. Tests cover filtering, skipping, dependencies, ordering, listing, overloads, analyzers, snapshots, and both execution modes. The alternate names andSkipTestsAPI are documented design choices that preserve the issue intent.
Full details: Out of Scope Changes check
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Explanation
The changes support issue
#4788. They include lifecycle implementation, public contexts and APIs, scheduler integration, source-generator and reflection support, analyzer and API snapshot updates, documentation, and focused unit and engine tests. The additionalBeforeEvery/AfterEveryhandling supports the existing hook model and is covered by tests. The dependency changes described in the PR are not represented in the reviewed change summary and are reported as moved to a separate pull request. No unrelated change is demonstrated.
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Full details: Docstring Coverage
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Explanation
Docstring coverage is 18.89% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 217 functions across 48 files. (1 skipped: 1 unsupported.)
Resolution
Write docstrings for the functions missing them to satisfy the coverage threshold.
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Before hooks trim, after hooks see,
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Review: TestFiltering hooks + Exclude/Skip/OrderI reviewed the diff and read Overall: The design is clean. One Concerns
Good
Overall this is a good feature. I'd ask for point 1 to be split out, and I'd consider points 2 and 3 before merge. |
 [High impact] The PR appears safe to merge; no new actionable issues remain. SummaryAdds
No new actionable issues were found. The previous keyed-priority finding is fixed.
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Review:
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Address review feedback on thomhurst#7071: - SkipTests no longer mutates TestContext while the hook runs. Matches are recorded as pending (first reason wins) and applied when the stage is sealed, only to tests still in the set, so a test that is skipped and then excluded is never modified. A reason set before the stage (e.g. by [Skip]) still wins. - Every predicate and key selector is evaluated before any state changes, so a callback that throws leaves the set unchanged. ExcludeTests already worked this way. - HookRank is now int? (null = not ordered) instead of using 0 as a sentinel, and ranks are applied at seal like skips. The scheduler compares ranks with Nullable.Compare; unranked runs order exactly as before. Documented that OrderTestsBy calls don't compose (last call wins; use a composite key). - _hookExcludedTests is reset at the top of every DiscoverTests call, not only for execution requests.
Review of #7071: TestFiltering hooks, ExcludeTests, SkipTests and OrderTestsByI read the engine flow in What I liked
Suggestions (non-blocking)
No blocking issues found. Nice work. |
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Thanks for the review. All points are addressed:
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Review:
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…hurst#4788) Add [Before/After(TestFiltering)] hooks that run after framework filtering (--treenode-filter, [Explicit]) and before the test session, with a new TestFilteringContext. TestDiscoveryContext ([After(TestDiscovery)]) and TestFilteringContext both gain: - ExcludeTests(predicate): drop tests from the run (not reported) - SkipTests(predicate, reason): report tests as skipped with a reason - OrderTestsBy(key, comparer?): rank tests by key; equal keys keep the default order (class, [NotInParallel(Order)]); [ExecutionPriority] still wins for parallel tests Behaviour: - Discovery-stage exclusions also hide tests from --list-tests/IDE; TestFiltering hooks run for execution requests only - An excluded [DependsOn] target is re-included (logged at Debug); a skipped one skips its dependents - Hook-excluded tests are hidden from TestContext dependency lookups - Contexts are sealed after their stage; [After(TestFiltering)] is read-only - Runs without TestFiltering hooks skip the stage (no extra allocations) Implemented for source-generated and reflection modes, with analyzer support, docs, public API snapshots, and unit/engine/snapshot tests. Also pin patched MessagePack 2.5.303 (GHSA-qhrr-8q5h-9q3h) in TUnit.Aspire.Core and the Aspire test AppHost. Aspire.Hosting 13.6.1 and StreamJsonRpc pull 2.5.302, which fails restore with NU1902; the central 3.x version is not API-compatible with them. Remove once Aspire depends on a patched MessagePack. BREAKING CHANGE: IHookExecutor has two new members, ExecuteBeforeTestFilteringHook and ExecuteAfterTestFilteringHook. Implementers must add them (GenericAbstractExecutor already does). HookType gains TestFiltering, and TestDiscoveryContext.AddTests throws once the [After(TestDiscovery)] hooks have finished.
…ocks.Http Microsoft.Extensions.Http was pinned to 10.0.12 for every target framework, so TUnit.Mocks.Http pulled Microsoft.Extensions.Logging* 10.x into net8.0 and net9.0 consumers, overriding the 8.x/9.x floors that TUnit.Logging.Microsoft, TUnit.Mocks.Logging and TUnit.AspNetCore.Core use. Add an HttpVersion property alongside the existing per-TFM versions: 8.0.1 (net8.0), 9.0.20 (net9.0), 10.0.12 (net10.0).
Revert Directory.Packages.props (per-TFM Microsoft.Extensions.Http) and the MessagePack pins in TUnit.Aspire.Core and the Aspire test AppHost to main. They are unrelated to the TestFiltering hooks and now live in their own PR (branch fix/dependency-version-floors).
Address review feedback on thomhurst#7071: - SkipTests no longer mutates TestContext while the hook runs. Matches are recorded as pending (first reason wins) and applied when the stage is sealed, only to tests still in the set, so a test that is skipped and then excluded is never modified. A reason set before the stage (e.g. by [Skip]) still wins. - Every predicate and key selector is evaluated before any state changes, so a callback that throws leaves the set unchanged. ExcludeTests already worked this way. - HookRank is now int? (null = not ordered) instead of using 0 as a sentinel, and ranks are applied at seal like skips. The scheduler compares ranks with Nullable.Compare; unranked runs order exactly as before. Documented that OrderTestsBy calls don't compose (last call wins; use a composite key). - _hookExcludedTests is reset at the top of every DiscoverTests call, not only for execution requests.
…ep overloaded hooks - Run ITestDiscoveryEventReceiver callbacks before [After(TestDiscovery)] hooks so categories, properties and other receiver-set metadata are visible to hooks, including on re-included [DependsOn] targets; shared by normal and streaming discovery. - Reflection mode: drop the (name, type) guards for After(TestFiltering) and After(TestDiscovery) hooks that silently skipped overloads; _registeredMethods already dedups by full signature, matching source-generated mode. - Track tests removed at discovery (including via AddTests) and report/hide them like TestFiltering exclusions. - Document scheduler sort stability, receiver order, and add XML docs. - Tests: overload fixtures for both stages, discovery exclusion with re-included dependency metadata, MutableTestSet Removed tracking.
- Break full ties in every grouping sort by input position, since
List<T>.Sort is unstable and tied tests could swap between runs.
- Document that unranked tests (re-included [DependsOn] targets) start
before ranked tests in the same phase.
- Note that the framework filter runs after [After(TestDiscovery)], so it
can still drop a test a hook skipped.
- Add a keyed [NotInParallel("key")] ordering fixture and engine test.
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Review: TestFiltering hooks (#7071)I reviewed Strengths
Suggestions (non-blocking)
Overall this is a well-structured, carefully designed feature, and the docs are thorough. The suggestions above are small and none of them should block the merge. |
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Thanks. All four are addressed in 9facd22:
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Actionable comments posted: 3
- 🪄 Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @docs/docs/writing-tests/hooks.md:
- Line 261: Update the Ordering description for OrderTestsBy to include
ExecutionPriority between class and [NotInParallel(Order)] in the equal-key
tie-break sequence, noting that the latter applies to sequential tests.
Review comments at @src/TUnit.Core/Models/TestDiscoveryContext.cs:
- Line 25: Update SetTests in TestSet to always snapshot its input into a new
array instead of retaining an IReadOnlyList<TestContext>, so later caller
mutations cannot change AllTests.
Review comments at @tests/TUnit.TestProject/TestFilteringOrderTests.cs:
- Around line 16-17: Update all three ordering hooks in TestFilteringOrderTests
to skip fixed-prefix assertions unless the selection contains the complete
relevant group: all three ordering tests, all four rank tests, or all three
keyed-order tests. Alternatively, make each assertion account for which tests
were selected; name each affected test group according to its ordering, rank, or
keyed-order behavior.
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…ery contexts - AddTests (MutableTestSet.SetTests) now rejects tests that were not discovered in this run, before changing any state, so every test still goes through dependency re-inclusion and registration. Duplicates count once instead of running twice. - Document AddTests as replacing the set with a subset of it. - Unit tests: foreign and null tests are rejected without changes, duplicates collapse, and a second request on the same TestDiscoveryContext starts from a fresh set.
Review:
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Thanks. Here's how each point is handled:
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Keyed [NotInParallel("key")] tests with different keys can overlap, so
[ExecutionPriority] now sorts before the OrderTestsBy rank in the keyed
and constrained parallel group sorts, matching the parallel sort. Within
a priority the rank still decides.
Document ExecutionPriority in the equal-key tie-break and the keyed-test
precedence in hooks.md and the OrderTestsBy XML docs.
Only apply the ordering fixtures' hooks when the run holds the whole
class, so a single-test filter no longer fails their fixed-prefix
assertions. Add a keyed-priority fixture and engine test.
Review of #7071 (TestFiltering hooks, ExcludeTests/SkipTests/OrderTestsBy)I read What looks good
Observations (non-blocking)
Overall this is a solid, well-tested design with no blocking issues found. |
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Automated review: 10 findings (6 correctness, 4 cleanup), from reading the code. Nothing was built or run.
| // on every built test, so After(TestDiscovery) hooks see complete metadata and any [DependsOn] | ||
| // target that is excluded and later re-included still has its attributes applied. | ||
| // ITestRegisteredEventReceiver runs later, at registration, and still sees what the hooks did. | ||
| await InvokePostResolutionEventsInParallelAsync(allTests).ConfigureAwait(false); |
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Lifecycle order change: ApplyAfterDiscoveryHooksAsync now runs the ITestDiscoveryEventReceivers (InvokePostResolutionEventsInParallelAsync) before the [After(TestDiscovery)] hooks and before TestSet.Initialize. Previously it was AddTests → hooks → receivers.
Impact: a receiver no longer sees StateBag/state written by an [After(TestDiscovery)] hook, and a receiver reading TestDiscoveryContext.Current.AllTests/TestClasses gets an empty list on the first request, or the previous request's stale contexts when ContextProvider caches the context.
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| if (pendingRanks is not null && pendingRanks.TryGetValue(test, out var rank)) | ||
| { | ||
| test.HookRank = rank; |
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HookRank isn't reset between stages. Seal writes HookRank onto each TestContext, and the discovery and filtering stages share one comparison space in TestGroupingService.
Example: [After(TestDiscovery)] calls OrderTestsBy(name) (ranks 1..500). [Before(TestFiltering)] excludes X, then calls OrderTestsBy(category) (ranks 1..3). X is re-included as a [DependsOn] target and keeps rank 417, so it sorts after every filtering-ranked test and its dependents wait until the end. The docs say unranked re-included dependency targets start before ranked tests.
| // Contract with ConstraintKeyScheduler: it stably re-sorts keyed tests by this value (ascending, ties | ||
| // by array position) and orders waiting candidates by it. When hooks ranked the run the list is already | ||
| // in its final order, so passing each test's position keeps that order intact. | ||
| private static int GetSchedulerPriority(bool hasHookRanks, TestPriority priority, int sortedIndex) |
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Priority order isn't preserved without hook ranks. If hooks didn't rank the run, GetSchedulerPriority falls back to TestPriority.GetHashCode(). ConstraintKeyScheduler sorts that value ascending, and a record-struct hash doesn't preserve Priority order, so keyed [NotInParallel("db")] tests with [ExecutionPriority(High)] can start after Low ones.
The keyed list is already sorted priority-first, so always passing the sorted index (dropping the hasHookRanks special case) fixes both paths.
| break; | ||
| case HookType.TestFiltering: | ||
| // [AfterEvery(TestFiltering)] is treated the same as [After(TestFiltering)], as for TestDiscovery | ||
| RegisterAfterTestFilteringHook(type, method, order); |
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Reflection and source-gen modes differ. Reflection mode dedupes registration by method signature (_registeredMethods) across Before and After attributes. So [Before(TestFiltering)] [After(TestFiltering)] static void Log(TestFilteringContext c) registers twice in source-gen mode, but in reflection mode the After registration is dropped by the TryAdd guard in RegisterAfterHook.
The guard predates this PR, but both filtering hooks take the same TestFilteringContext, which makes this pattern natural here. AGENTS.md requires identical metadata behaviour in both modes. Keying by (hook kind + signature) would fix it.
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| foreach (var test in _tests) | ||
| { | ||
| // A reason set before the stage (e.g. by [Skip]) wins over hook skips. |
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This guard never fires for [Skip]. "A reason set before the stage (e.g. by [Skip]) wins over hook skips" checks test.SkipReason, but SkipAttribute applies its reason in OnTestRegistered, during RegisterTestsAsync, which runs after both stages are sealed.
So the hook's reason is set first, a Before(TestFiltering) predicate like t => t.SkipReason is null matches [Skip] tests, and a conditional SkipAttribute subclass or receiver that only skips when SkipReason is empty behaves differently. The documented "already-skipped tests keep their original reason" only holds because the attribute overwrites the reason later.
| // Now invoke event receivers (registration phase) | ||
| // ITestRegisteredEventReceiver can access dependency information and any state set by After(TestDiscovery) hooks | ||
| await InvokePostResolutionEventsInParallelAsync(allTests).ConfigureAwait(false); | ||
| allTests = await ApplyAfterDiscoveryHooksAsync(contextProvider, allTests, cancellationToken).ConfigureAwait(false); |
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The streaming path doesn't re-include dependencies. DiscoverTestsFullyStreamingAsync drops tests excluded by [After(TestDiscovery)] but, unlike DiscoverTests (IncludeDependencies), never re-includes excluded [DependsOn] targets. If X is excluded and Y depends on X, Y's in-degree never reaches 0, so Y hits the cycle-break fallback and is yielded without its dependency.
The method currently has no callers, so this is latent until it's wired in.
| return ordered.ToArray(); | ||
| } | ||
| /// <summary> | ||
| /// Gets every discovered test, before framework filtering (tree-node filters, <c>[Explicit]</c>) is applied. |
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Doc doesn't hold on the filtered path. This says AllTests holds every discovered test "before framework filtering (tree-node filters, [Explicit]) is applied". But on the filter-aware execution path (filter != null && isForExecution), DiscoverAndResolveTestsAsync pre-filters metadata before building tests. With --treenode-filter /A/*/*/*, hooks only see the matching tests and their dependencies. Either reword the doc or call out this exception.
| /// <c>[After(TestFiltering)]</c> hooks see the final set and cannot change it. | ||
| /// These hooks run only when tests are executed, not for discovery-only requests such as <c>--list-tests</c>. | ||
| /// </remarks> | ||
| public class TestFilteringContext : Context |
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Duplicated API surface. This copies TestDiscoveryContext's whole test-set API (AllTests, Assemblies, TestClasses, ExcludeTests, SkipTests, OrderTestsBy) plus about 30 lines of identical XML docs. A shared base (or interface) over MutableTestSet would declare these members once and stop the exclude/skip/order semantics and docs drifting apart.
| // back to the input position so the order is deterministic (List<T>.Sort is unstable). | ||
| notInParallelList.Sort((a, b) => | ||
| { | ||
| var rankCompare = CompareHookRank(a.Test, b.Test); |
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Hot path nit. The sequential and keyed sorts call CompareHookRank(a.Test, b.Test), which reads test.Context.HookRank (nullable) on every comparison, adding O(N log N) extra lookups. The parallel path already caches HookRank in TestSortKey. Carrying it into the notInParallel/keyed tuples the same way as ClassName/Index would avoid the repeated reads.
| break; | ||
| case HookType.TestFiltering: | ||
| // [BeforeEvery(TestFiltering)] is treated the same as [Before(TestFiltering)], as for TestDiscovery | ||
| RegisterBeforeTestFilteringHook(type, method, order); |
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Cleanup. The PR extracts helpers for After(TestDiscovery) and both TestFiltering hooks, but Before(TestDiscovery) is still built inline in two places (RegisterBeforeHook and RegisterBeforeEveryHook). A matching RegisterBeforeTestDiscoveryHook helper would remove the last copy, so future changes to hook construction (FilePath, RegistrationIndex, executor) only touch one place.
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Thanks for this, @Quattordici. It's a well-thought-out feature. However, it includes breaking changes, so we can't merge it into the current major version:
We're deferring this until a V2. We're not ready to start V2 yet, so this will be on hold for a while. The inline review comments above still apply when we pick it up. |
Description
Adds a hook stage that runs once the final set of tests is known, and lets hooks exclude, skip and order tests.
New
[Before/After(TestFiltering)]hooks run after framework filtering (--treenode-filter,[Explicit]) and before the test session. They receive a newTestFilteringContext.[Before(TestFiltering)]can change the set;[After(TestFiltering)]sees the final set and is read-only.TestDiscoveryContextandTestFilteringContextgain:ExcludeTests(predicate): drop tests from the run (not reported).SkipTests(predicate, reason): report tests as skipped with a reason.OrderTestsBy(key, comparer?): rank tests by key. Tests with equal keys keep the default order (class, then[NotInParallel(Order)]), so a coarse key such as a category doesn't break existing sequences.[ExecutionPriority]still wins for tests that can run in parallel.Behaviour
[After(TestDiscovery)]also hide tests from--list-testsand the IDE.TestFilteringhooks run for execution requests only.[DependsOn]target is re-included, as with--treenode-filter, and logged at--log-level Debug. A skipped one skips its dependents.TestContext.Current.Dependencies.GetTests(...), so lookups no longer throw "Cannot get unfinished tests".[After(TestFiltering)], throwsInvalidOperationException.TestFilteringhooks skip the stage entirely, so there are no extra allocations.Design notes (differences from the issue)
TestFilteringinstead ofFiltering. It matchesTestDiscovery, andHookTypemembers land in every user's scope through the globalusing static TUnit.Core.HookType, so a bareFilteringcould clash with user types.SkipTestswas added alongsideExcludeTests, so policy-based exclusions can stay visible in reports.OrderTestsByreplaces the proposedReorderTests(Func<IEnumerable, IEnumerable>). It can't add or drop tests, and equal keys don't override[NotInParallel(Order)].AllTests, consistent with the existing contexts, instead of the proposedTests.Dependency fixes included
TUnit.Aspire.Coreand the Aspire test AppHost. Aspire.Hosting 13.6.1 and StreamJsonRpc pull 2.5.302, which failed restore with NU1902. The central 3.x version is not API-compatible with them.Microsoft.Extensions.Httpnow uses per-TFM versions (8.0.1 / 9.0.20 / 10.0.12). The previous 10.0.12-for-all-TFMs pin pulledMicrosoft.Extensions.Logging*10.x into net8.0/net9.0 consumers ofTUnit.Mocks.Http.Related Issue
Fixes #4788
Type of Change
Breaking:
IHookExecutorhas two new members,ExecuteBeforeTestFilteringHookandExecuteAfterTestFilteringHook. Direct implementers must add them;GenericAbstractExecutoralready does.TestDiscoveryContext.AddTestsnow throws once the[After(TestDiscovery)]hooks have finished.Checklist
Required
TUnit-Specific Requirements
TUnit.Core.SourceGenerator)TUnit.Engine)TUnit.Core.SourceGenerator.Testsand/orTUnit.PublicAPItests.received.txtfiles and accepted them as.verified.txt.verified.txtfiles[DynamicallyAccessedMembers]annotationsdotnet publish -p:PublishAot=trueTesting
dotnet test)Additional Notes
Tests added:
MutableTestSetTests(unit), TestProject fixtures with matching engine tests for exclude/skip, dependencies, total and ranked ordering (checked via TRX start times) and dependency lookups, a--list-testscase, a hook-generator snapshot, and analyzer cases.Verified locally (.NET 10 SDK):
[EngineTest=Pass]set passes in source-gen mode (5,964 tests, 0 failed) and viaExpectedStateTestsin reflection mode.TUnit.Mocks.Http.Testspasses on net8/net9/net10.Not verified locally:
Core_Library_Has_No_API_Changessnapshots were updated by applying the same API lines as net10, because only the .NET 10 runtime was available.pwsh; the newhooks.mdexample was compiled separately instead.dotnet testor the benchmarks.Not changed: references between TUnit packages remain minimum-version (
>= X) rather than exact. Pinning tightly coupled pairs such as Core↔Engine is a packaging-policy decision, so it's left for a separate discussion.Summary by CodeRabbit