Process every GenerateMock attribute

[thomhurst]

Summary

• process every assembly-level GenerateMock attribute instead of returning after the first
• add a regression test using the reported Amazon.SQS.IAmazonSQS interface
• retain the exact AWS SDK dependency used by the regression test

Root cause

Roslyn supplies repeated assembly attributes together in one GeneratorAttributeSyntaxContext. TransformGenerateMockAttribute returned from inside its loop, so only the first attribute produced mock models and all later attributes were silently ignored.

Impact

Projects with multiple GenerateMock attributes now receive generated mocks for every valid target, including Amazon.SQS.IAmazonSQS when it is not the first attribute.

Validation

• regression failed before the fix across net8.0, net9.0, and net10.0
• TUnit.Mocks.SourceGenerator.Tests: 303 passed across all three target frameworks
• Roslyn compatibility builds: 4.4, 4.7, and 4.14
• no .received.txt snapshot files

Fixes#6604

Summary by CodeRabbit

• Bug Fixes

  • Mock generation now supports multiple assembly-level mock declarations, ensuring all specified interfaces receive generated mocks.

• New Features

  • Added support for generating mocks for Amazon SQS interfaces.

• Tests

  • Added coverage validating mock generation across multiple targets, including Amazon SQS integrations.

• Chores

  • Standardized the Amazon SQS SDK package version across the project.

[coderabbitai]

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: cf336d12-5805-4404-b194-b92e8a3b3974

📥 Commits

Reviewing files that changed from the base of the PR and between 3bf6439 and d7d3045.

📒 Files selected for processing (1)

• src/TUnit.Mocks.SourceGenerator/Discovery/MockTypeDiscovery.cs

📝 Walkthrough

Walkthrough

The source generator now processes all valid assembly-level GenerateMock attributes. Tests verify mock generation for multiple targets, including Amazon.SQS.IAmazonSQS, with centralized SQS package version management.

Changes

Mock attribute discovery

Layer / File(s)	Summary
Accumulate generated mock models src/TUnit.Mocks.SourceGenerator/Discovery/MockTypeDiscovery.cs	The discovery logic adds models from every valid assembly-level GenerateMock attribute and returns the complete collection.
Validate multiple generated mocks tests/TUnit.Mocks.SourceGenerator.Tests/MockGeneratorTests.cs, tests/TUnit.Mocks.SourceGenerator.Tests/TUnit.Mocks.SourceGenerator.Tests.csproj, Directory.Packages.props	A snapshot test verifies mocks for IFirst and Amazon.SQS.IAmazonSQS. The test project references AWSSDK.SQS version 4.0.100.7.

Estimated code review effort: 2 (Simple) | ~10 minutes

Mergeability Score:🟡 Moderate · up to 3bf64

The PR correctly processes multiple GenerateMock attributes, but its regression coverage does not compile the generated SQS mock and does not include the required verified snapshot for changed generator output, leaving concrete correctness and verification gaps that should be addressed before merge.

Possibly related PRs

• thomhurst/TUnit#6605: Both changes modify mock source-generator attribute discovery and its tests.

Poem

A rabbit checked each mock in line,
No target left behind this time.
SQS joins the generated queue,
Two attributes make mocks anew.
Hop, hop— the snapshot proves it true!

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 25.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly states the primary change: processing every assembly-level GenerateMock attribute.
Linked Issues check	✅ Passed	The generator now processes all GenerateMock attributes and tests the IAmazonSQS failure case described in issue #6604.
Out of Scope Changes check	✅ Passed	The package configuration and test dependency directly support the regression test, with no unrelated code changes.

✨ Finishing Touches 💡 1

📝 Generate docstrings 💡

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch agent/multiple-generate-mock-attributes

---

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[greptile-apps]

Greptile Summary

The PR fixes assembly-level mock discovery so every valid GenerateMock attribute contributes generation requests instead of stopping after the first.

• Accumulates requests across all matching assembly attributes.
• Adds a multi-attribute regression test using Amazon.SQS.IAmazonSQS.
• Centrally adds the exact AWS SQS SDK dependency required by the regression.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains.

Important Files Changed

Filename	Overview
src/TUnit.Mocks.SourceGenerator/Discovery/MockTypeDiscovery.cs	Moves request accumulation outside the attribute loop so all valid assembly-level declarations are processed.
tests/TUnit.Mocks.SourceGenerator.Tests/MockGeneratorTests.cs	Adds regression coverage confirming that mocks are emitted for both a local interface and the later AWS SQS interface.
tests/TUnit.Mocks.SourceGenerator.Tests/TUnit.Mocks.SourceGenerator.Tests.csproj	Adds the AWS SQS package reference needed by the new regression test.
Directory.Packages.props	Centrally pins the AWS SQS SDK dependency in accordance with repository package-management conventions.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart LR
A["Assembly GenerateMock attributes"] --> B["Transform each attribute"]
B --> C["Accumulate MockGenerationRequest values"]
C --> D["Deduplicate models"]
D --> E["Generate each mock"]

Loading

_{Reviews (2): Last reviewed commit: "chore: merge main into mock attribute fi..." | Re-trigger Greptile}

[claude]

Review

Fix is correct.TransformGenerateMockAttribute previously returned inside the foreach (var attr in context.Attributes) loop, so a GeneratorAttributeSyntaxContext carrying multiple assembly-level [assembly: GenerateMock(typeof(T))] attributes only ever emitted a model for the first valid one — every subsequent attribute in that syntax context was silently dropped. Switching to an ImmutableArray.CreateBuilder<MockTypeModel> that accumulates via AddRange across the whole loop is the right fix and matches the pattern the sibling transforms (TransformToModels, TransformMockExtensionInvocation) already use for their outer callers.

I traced the consumer side in MockGenerator.cs to confirm this doesn't introduce duplicate-emission risk: attributeTypes is flattened via .SelectMany (so multiple models per assembly context is already an expected shape), and Step 2 folds mockTypes/attributeTypes/extensionTypes into a HashSet<MockTypeModel> before generation, so even if the same type were reachable via more than one attribute it'd still be deduplicated before RegisterSourceOutput. No architectural concerns there.

Test.Multiple_GenerateMock_Attributes_Generate_Every_Mock is a solid regression test — it reproduces the exact multi-attribute shape that triggers the bug and asserts both mocks are generated. Using the real Amazon.SQS.IAmazonSQS type (rather than a synthetic interface, which is otherwise the convention in this test project — see Issue6505Tests.cs) is a reasonable call here since it's tied to the actual reported repro and exercises a large SDK-shaped interface as the second attribute in the list, which a small synthetic type might not stress in the same way. Only minor trade-off worth flagging: it adds a third-party package to Directory.Packages.props (and therefore the whole solution's dependency graph) for a single test-only reference — not a blocker, just something to keep in mind if it needs a version bump later since it's now central rather than test-local.

Scope check. Change is minimal and targeted: no unrelated refactoring, the continue filtering logic for invalid attributes (sealed types, value types, wrong arg count) is untouched, and the loop's early-exit semantics for filtering are preserved — only the early-return for successful matches was removed. Package/csproj changes are consistent (central version pin + unversioned PackageReference in the test project).

No blocking issues found. Looks good to merge.

[coderabbitai]

Actionable comments posted: 2

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Inline comments:
In `@tests/TUnit.Mocks.SourceGenerator.Tests/MockGeneratorTests.cs`:
- Around line 1747-1754: Extend the regression test using the
generated-compilation helper after RunGenerator, supplying the SQS assembly
reference and all required transitive metadata references used by the test.
Assert that the resulting compilation has no errors, while retaining the
existing IFirstMock and IAmazonSQSMock source-presence assertions.
- Around line 1732-1756: Update
Multiple_GenerateMock_Attributes_Generate_Every_Mock to assert the generated
output through the project’s snapshot-testing mechanism in addition to or
instead of direct string checks, then generate and commit the corresponding
.verified.txt snapshot. Do not add or commit any .received.txt file.

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Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 8cde6b41-2ef6-41ac-a65b-5aa368e5efe2

📥 Commits

Reviewing files that changed from the base of the PR and between 34b153a and 3bf6439.

📒 Files selected for processing (4)

• Directory.Packages.props
• src/TUnit.Mocks.SourceGenerator/Discovery/MockTypeDiscovery.cs
• tests/TUnit.Mocks.SourceGenerator.Tests/MockGeneratorTests.cs
• tests/TUnit.Mocks.SourceGenerator.Tests/TUnit.Mocks.SourceGenerator.Tests.csproj