Add outstanding test improver coverage

[Amaury Levé (Evangelink)]

Summary

• add MSTEST0038 coverage for null reference arguments and constrained/unconstrained generic type parameters
• verify MSTEST0033 suppression boundaries for fields, getter-only properties, and non-public properties
• cover MSTEST0051 method-group/delegate inputs
• extend MSTEST0062 and its fixer to handle ref readonly parameters without escaped-keyword false positives
• consolidate the remaining July test-improver work; the other tracker items already landed in test: MSTEST0029 — add edge case tests for virtual/override and make-private fixer #9785, test: MSTEST0061 — add edge case tests for OSPlatform.Create and mobile OS platforms #9818, Fix MSTEST0063 to detect invalid constructors on derived TestClass attributes #9851, Add explicit type tests for AvoidOutParameterOnAssertIsInstanceOfTypeFixer #9885, Add MSTEST0035 tests for custom RetryBaseAttribute subclasses #9923, test: add edge-case tests for TestClassShouldBeValidAnalyzer static-class guard #9967, and Add MSTEST0070 member name edge-case tests #10031

Validation

• build.cmd -binaryLog
• targeted MSTest.Analyzers builds: 0 warnings and 0 errors
• focused MSTest.Analyzers unit-test classes pass

Closes#9717
Closes#9837
Closes#9919
Closes#9952
Closes#10027
Closes#10049
Closes#10050
Closes#10058
Closes#10059
Closes#10064

[Copilot]

Pull request overview

Adds edge-case coverage for four MSTest analyzer rules.

Changes:

• Tests MSTEST0028 and MSTEST0038 boundary behavior.
• Covers delegate inputs for MSTEST0051.
• Adds C# ref readonly coverage for MSTEST0062.

Show a summary per file

File	Description
NonNullableReferenceNotInitializedSuppressorTests.cs	Tests field and getter-only property suppression boundaries.
AvoidOutRefTestMethodParametersAnalyzerTests.cs	Adds ref readonly parameter coverage.
AvoidAssertAreSameWithValueTypesAnalyzerTests.cs	Tests null and generic arguments.
AssertThrowsShouldContainSingleStatementAnalyzerTests.cs	Tests method-group and delegate inputs.

Review details

• Files reviewed: 4/4 changed files
• Comments generated: 2
• Review effort level: Medium

[Copilot]

Review details

• Files reviewed: 6/6 changed files
• Comments generated: 3
• Review effort level: Medium

[Copilot]

Review details

• Files reviewed: 7/7 changed files
• Comments generated: 0 new
• Review effort level: Medium

[Copilot]

Review details

• Files reviewed: 7/7 changed files
• Comments generated: 1
• Review effort level: Medium

[Copilot]

Review details

• Files reviewed: 7/7 changed files
• Comments generated: 2
• Review effort level: Medium

[Copilot]

Review details

• Files reviewed: 7/7 changed files
• Comments generated: 1
• Review effort level: Medium

[Copilot]

Review details

• Files reviewed: 7/7 changed files
• Comments generated: 0 new
• Review effort level: Medium

[github-actions]

🧪 Test quality grade — PR #10070

Grade	Test	Notes
A (90–100)	new AvoidOutRefTestMethodParametersAnalyzerTests. WhenRefReadonlyModifiersContainComment_ CodeFixPreservesComment	Clean end-to-end code-fix assertion with focused before/after snippets — 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. · 44.7 AIC · ⌖ 4.81 AIC · ⊞ 8.9K · [◷]( · ◷)