test: add edge-case tests for TestClassShouldBeValidAnalyzer static-class guard

[Evangelink]

Goal

Fixes #9951.

The TestClassShouldBeValidAnalyzer (MSTEST0002) static-class validation branch had two untested paths. This PR adds two focused tests to TestClassShouldBeValidAnalyzerTests.

Changes

• WhenStaticTestClassContainsDerivedTestMethodAttribute_Diagnostic — a static [TestClass] with [DataTestMethod] (a TestMethodAttribute subclass) fires MSTEST0002, exercising the attribute.AttributeClass.Inherits(testMethodAttributeSymbol) branch of the static-class guard.
• WhenStaticTestClassContainsGlobalTestInitialize_NoDiagnostic — a static [TestClass] with only [GlobalTestInitialize] does NOT fire, confirming the analyzer intentionally omits that attribute from the static-class check (it only checks TestInitialize, TestCleanup, ClassInitialize, ClassCleanup, and TestMethod-derived attributes).

Verification

Built and ran MSTest.Analyzers.UnitTests on net472 and net8.0 — all tests pass.

Co-authored-by: Copilot App 223556219+Copilot@users.noreply.github.com

[Copilot]

Pull request overview

Adds edge-case coverage for MSTEST0002’s static-class guard.

Changes:

• Tests derived TestMethodAttribute detection.
• Tests omission of GlobalTestInitialize.

Show a summary per file

File	Description
TestClassShouldBeValidAnalyzerTests.cs	Adds two focused static-class analyzer tests.

Review details

• Files reviewed: 1/1 changed files
• Comments generated: 1
• Review effort level: Medium

[github-actions]

Note

🤖 Automated review by GitHub Copilot. Generated by the Expert Code Review workflow. To request a follow-up action, reply by tagging @copilot directly.

Review Summary

Two new analyzer unit tests for TestClassShouldBeValidAnalyzer — one verifying that derived [TestMethod] attributes (e.g. [DataTestMethod]) trigger the static-class diagnostic, and one verifying that [GlobalTestInitialize] does not. Both are well-structured and follow existing conventions.

#	Dimension	Verdict
1	Algorithmic Correctness	✅ N/A — test-only, logic is straightforward
2	Threading & Concurrency	✅ N/A
3	Security & IPC Contract Safety	✅ N/A
4	Public API & Binary Compatibility	✅ N/A — no public API changes
5	Performance & Allocations	✅ N/A — test code only
6	Cross-TFM Compatibility	✅ N/A
7	Resource Management	✅ N/A
8	Error Handling	✅ N/A
9	Naming & Conventions	✅ Clean — method names follow When..._Diagnostic/_NoDiagnostic pattern
10	Documentation & Comments	✅ Clean — inline comments explain why each test exists
11	Test Quality	✅ Clean — tests are focused, comments explain the analyzer behavior being validated
12	Localization	✅ N/A
13	Telemetry	✅ N/A
14	Logging	✅ N/A
15	Configuration	✅ N/A
16	Serialization	✅ N/A
17	Build & Packaging	✅ N/A
18	Backward Compatibility	✅ N/A
19	Code Duplication	✅ Clean
20	Scope Discipline	✅ Clean — single concern
21	TODO Hygiene	✅ N/A — no TODOs
22	PowerShell & Script Hygiene	✅ N/A

Verdict: No issues found. Clean addition of two well-motivated test cases.

[Copilot]

Review details

• Files reviewed: 1/1 changed files
• Comments generated: 0 new
• Review effort level: Medium

[github-actions]

🧪 Test quality grade — PR #9965

Grade	Test	Notes
A (90–100)	new TestClassShouldBeValidAnalyzerTests. WhenStaticTestClassContainsDerivedTestMethodAttribute_ Diagnostic	Clear AAA; VerifyAnalyzerAsync with explicit location and arguments verifies the correct diagnostic fires. No issues found.
A (90–100)	new TestClassShouldBeValidAnalyzerTests. WhenStaticTestClassContainsGlobalTestInitialize_ NoDiagnostic	Concise negative test; comment clearly explains why [GlobalTestInitialize] must not trigger the diagnostic. No issues found.

_{This advisory comment was generated automatically. Grades are heuristic
and informational — they do not block merging. Re-run with
/grade-tests.}

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🤖 Automated content by GitHub Copilot. Generated by the Grade Tests on PR (on open / sync) workflow. · 29.3 AIC · ⌖ 5.62 AIC · ⊞ 8.9K · [◷]( · ◷)

[Evangelink]

Closing in favor of #9967, which covers the same static-class guard gap and additionally verifies the code-fix output (converting \static class\ -> \class). Consolidating on the stronger of the two duplicate PRs.