Fix mocks for inaccessible method signature types - #6641
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Keep required overrides; omit setup APIs with inaccessible types. Refs #6634
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📝 WalkthroughWalkthroughThe mock source generator now records method signature accessibility and excludes inaccessible methods from generated extensions and typed wrappers. Regression tests cover protected nested types, abstract gRPC-style clients, generated overrides, factories, extensions, and mock helpers. ChangesAccessible mock signature generation
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🟡 Moderate · up to The change can still generate consumer-facing code that fails to compile for methods with inaccessible generic constraints, and it may omit convenience helpers for otherwise accessible overloads. Merge should wait for these filtering paths to be corrected; the remaining test additions are follow-up coverage. Poem
🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches📝 Generate docstrings
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Greptile SummaryThe PR separates members that must remain on generated implementations from members that can legally appear on consumer-facing setup surfaces. The generic-constraint fix remains incomplete for interface wrappers.
Confidence Score: 4/5The PR is not yet safe to merge because an interface method with an inaccessible generic constraint can still make the generated wrapper fail compilation. The primary setup surface now excludes inaccessible generic constraints, but MockWrapperTypeBuilder independently emits forwarding and generic wrapper declarations for every method without applying the new accessibility flag. Files Needing Attention: src/TUnit.Mocks.SourceGenerator/Discovery/MemberDiscovery.cs and src/TUnit.Mocks.SourceGenerator/Builders/MockWrapperTypeBuilder.cs
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| Filename | Overview |
|---|---|
| src/TUnit.Mocks.SourceGenerator/Discovery/MemberDiscovery.cs | Records assembly-level signature accessibility, including generic constraints, but the resulting flag is not enforced by every consumer-facing builder. |
| src/TUnit.Mocks.SourceGenerator/Discovery/TypeAccessibility.cs | Recursively classifies arrays, containing types, generic arguments, and unresolved symbols for assembly accessibility. |
| src/TUnit.Mocks.SourceGenerator/Builders/MockMembersBuilder.cs | Correctly filters inaccessible methods, properties, indexers, and events from the primary setup and verification surface. |
| src/TUnit.Mocks.SourceGenerator/Builders/MockImplBuilder.cs | Preserves required implementation members while limiting helper visibility and unavailable ref-struct setup machinery. |
| tests/TUnit.Mocks.SourceGenerator.Tests/Issue6634Tests.cs | Provides broad regression coverage for inaccessible signatures, but the generic-constraint case covers an abstract class rather than the unfiltered interface-wrapper path. |
| tests/TUnit.Mocks.SourceGenerator.Tests/Snapshots/Grpc_Style_Abstract_Method_Generation_Snapshot.verified.txt | Confirms that the gRPC-style override remains generated while its inaccessible setup API is omitted. |
Flowchart
%%{init: {'theme': 'neutral'}}%%
flowchart TD
A[Discover generic method] --> B[Check return, parameters, and constraints]
B --> C{Signature accessible?}
C -->|Yes| D[Emit primary setup surface]
C -->|No| E[Omit primary setup surface]
A --> F[Build interface wrapper]
F --> G[Emit forwarding and generic wrapper members]
G --> H[Inaccessible constraint is named in consumer assembly]
H --> I[Compilation error]
Reviews (2): Last reviewed commit: "fix(mocks): filter all inaccessible surf..." | Re-trigger Greptile
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In `@src/TUnit.Mocks.SourceGenerator/Builders/MockMembersBuilder.cs`:
- Around line 107-108: Extract the configurable-method predicate currently used
before extension emission into a shared predicate, then apply it consistently to
the method sequence consumed by EmitAnyArgsOverload and EmitParamsAnyArgOverload
collision checks. Ensure inaccessible methods are excluded from both
convenience-overload checks while preserving the existing
IsSignatureAccessibleFromAssembly, ExplicitInterfaceName, and IsStaticAbstract
conditions.
In `@src/TUnit.Mocks.SourceGenerator/Discovery/MemberDiscovery.cs`:
- Around line 758-761: Update IsMethodSignatureAccessibleFromAssembly to also
validate every constraint type from method.TypeParameters, using
TypeAccessibility.IsAccessibleFromAssembly alongside the return type and
parameter checks. Ensure methods with inaccessible generic constraint types are
rejected while leaving abstract override generation unchanged.
In `@tests/TUnit.Mocks.SourceGenerator.Tests/Issue6634Tests.cs`:
- Around line 52-137: Add a reflection-mode test for the GrpcClient mocking
scenario covered by
Grpc_Style_Abstract_Method_With_Protected_Internal_State_Is_Mockable, creating
and configuring the mock through TUnit.Engine reflection execution rather than
RunGenerator. Invoke the generated mock’s relevant methods and assert the same
accessibility and behavior outcomes, ensuring both execution modes are
explicitly covered.
Apply the same fix in `@tests/TUnit.Mocks.SourceGenerator.Tests/Issue6634Tests.cs`
around lines 73 - 112: Covers the new unresolved-symbol accessibility branch.
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Code review
Reviewed the fix for gRPC-style inaccessible-signature-type mocking (#6634). The core idea — keep the required override in the generated mock impl but omit the public setup/verify extension for members whose signature can't legally be named outside the mock subclass — is sound, and the new Issue6634Tests.cs coverage for the motivating method case (and the IErrorTypeSymbol defensive check) looks correct. CLAUDE.md compliance is clean (snapshot committed as .verified.txt, no VSTest, no blocking async, N/A for dual-mode/AOT since this is source-gen-only compile-time logic).
However, the fix is implemented as a filter bolted onto two call sites in MockMembersBuilder.cs (instanceMethods and WrappedMethods) rather than as a single accessibility gate applied uniformly wherever a member can reach a public generated signature. That's the root cause of three gaps found below — the same bug class (CS0122/CS0246 from naming an inaccessible type in generated public code) resurfaces in three sibling code paths that weren't touched:
1. Properties, indexers, and events get no accessibility protection
MockMemberModel.IsSignatureAccessibleFromAssembly (Models/MockMemberModel.cs#L75-L85) defaults to true and is only ever computed for methods, in CreateMethodModel. CreatePropertyModel/CreateIndexerModel in MemberDiscovery.cs never set it, and the property/indexer/event extension filters in Builders/MockMembersBuilder.cs#L118-L146 check only IsConfigurableSurfaceProperty/IsIndexer/IsStaticAbstract — no accessibility check at all. So protected abstract State Config { get; } (with State inaccessible) still emits a public PropertyMockCall<State> Config extension → the exact CS0122 this PR sets out to fix, just for properties. Same gap for indexers (Item/SetItem) and events. This is untested — Issue6634Tests.cs only covers methods and constructors.
2. New regression: dangling out/ref setter-delegate reference → CS0246
Builders/MockMembersBuilder.cs#L186-L216: EmitOutRefSetterDelegateNamespace now sources its delegate list from WrappedMethods, which this PR filters on IsSignatureAccessibleFromAssembly. But MockImplBuilder.EmitOutRefParamAssignments (Builders/MockImplBuilder.cs#L1556-L1585) still emits a reference to that delegate for every method in model.Methods with a non-span ref-struct out/ref parameter, gated only on SupportsClosedRefStructSetter (accessibility-independent). Before this PR the two filters agreed; now a method with one inaccessible parameter and a separate ref-struct out/ref parameter (e.g. protected abstract void Read(State s, ref Buffer b);) has its delegate declaration dropped from WrappedMethods while the impl still references it by name — a new CS0246, not present before this PR.
3. Generic method constraints aren't checked
IsMethodSignatureAccessibleFromAssembly (Discovery/MemberDiscovery.cs#L756-L763) only checks the return type and parameter types. Type parameters are always "accessible" in TypeAccessibility.IsAccessibleFromAssembly regardless of their constraints, but constraint clauses are emitted verbatim into the public extension signature (GetCombinedConstraintClauses in MockMembersBuilder.cs). So protected abstract void Handle<T>(T value) where T : State; (with State inaccessible) still gets a public extension whose where T : State clause triggers CS0122 — again the same bug class, just via a constraint instead of a parameter/return type.
Suggested direction
Rather than patching each of these three sites individually, consider computing one IsSignatureAccessibleFromAssembly-style predicate that covers everything which can appear in a member's public generated signature (parameter/return types for methods, property/indexer/event types, and generic constraint types), and apply it at a single point — ideally as part of the existing member-accessibility filtering in MemberDiscovery.cs (IsMemberAccessible) rather than as an additional per-call-site .Where() in the builder. That would also keep the out/ref delegate emission automatically in sync instead of requiring a second parallel accessibility check in MockImplBuilder.
All three issues were independently verified against the current code (not just the diff) before being reported here.
Keep signature filtering aligned across members and generated helpers. Refs #6634
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Addressed verified review gaps in c06f3c5:
Added one focused regression per behavior. Full TUnit.Mocks source-generator suite passes: 384/384 across net8.0, net9.0, and net10.0. No snapshot changes. The requested reflection-mode mock test is not applicable: TUnit.Engine reflection mode is an alternate test-metadata collection path, not an alternate TUnit.Mocks implementation. TUnit.Mocks is compile-time source-generated in both cases, so such a test would execute the same generated code rather than cover a second path. |
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| && method.TypeParameters.All(typeParameter => | ||
| typeParameter.ConstraintTypes.All(constraint => | ||
| TypeAccessibility.IsAccessibleFromAssembly(constraint, compilation))); |
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When a mocked generic interface method is constrained to a type inaccessible from the consumer assembly, MockWrapperTypeBuilder emits forwarding and generic wrapper declarations without applying IsSignatureAccessibleFromAssembly, causing the generated consumer code to fail compilation with an accessibility error such as CS0122.
Knowledge Base Used: TUnit.Mocks: source-generated mocking
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| => method.IsSignatureAccessibleFromAssembly | ||
| && (method.ExplicitInterfaceName is null || method.IsStaticAbstract); |
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When a multi-type mock's primary class has an inaccessible method such as protected State Get() and an additional interface exposes int Get(), this predicate removes the primary method from the generated member surface, but SecondarySurfaceFactory.CreateContext still adds it to PrimaryMethodNameParams. Consequently, BuildPairModel unnecessarily renames the accessible interface setup to IExtra_Get, even though no primary Get extension exists to conflict with it. Apply the same accessibility predicate when constructing the primary collision context so the secondary API retains its expected name.
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Code reviewRe-reviewed after the follow-up commit (c06f3c5) addressing the three gaps flagged in the previous review. All three are fixed correctly:
Also checked the shared-extraction refactor ( No new issues found. CLAUDE.md compliance is clean: no snapshot |
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Summary
Why
gRPC
ClientBase<T>uses a protected abstractNewInstancemethod whose parameter is a protected-internal nestedClientBaseConfiguration. The generated subclass can override that member, but generated static setup APIs in the consumer assembly cannot expose its parameter type. This producedCS0122and prevented gRPC clients from being mocked.Tests
dotnet test tests/TUnit.Mocks.SourceGenerator.Tests/TUnit.Mocks.SourceGenerator.Tests.csproj --no-restore(360 passed across net8.0, net9.0, and net10.0)Refs #6634
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Bug Fixes
Tests