[Test Improver] Add unit tests for RetryAttribute

[Evangelink]

Add 13 unit tests covering RetryAttribute constructor validation, BackoffType property validation, and ExecuteAsync retry logic:

• Constructor rejects maxRetryAttempts < 1
• BackoffType setter rejects invalid enum values
• ExecuteAsync stops early when retry succeeds
• ExecuteAsync runs exactly MaxRetryAttempts times on all failures
• ExecuteAsync stops on Inconclusive result

Fixes #7824

[Copilot]

Pull request overview

Adds focused unit-level coverage for RetryAttribute behavior in the MSTest framework test suite, complementing existing integration-level coverage (per #7824).

Changes:

• Adds constructor validation tests for RetryAttribute(maxRetryAttempts).
• Adds BackoffType property validation tests (invalid enum values rejected, default/valid values accepted).
• Adds ExecuteAsync retry-loop behavior tests (early success, max-attempt failures, timeout propagation, inconclusive stop).

Show a summary per file

File	Description
test/UnitTests/TestFramework.UnitTests/Attributes/RetryAttributeTests.cs	New unit tests covering RetryAttribute validation and retry execution logic.

Copilot's findings

• Files reviewed: 1/1 changed files
• Comments generated: 2

[github-actions]

Commit pushed: 5a55703

Generated by Daily Test Improver

[github-actions]

🤖 Test Improver here - I'm an automated AI assistant.

Pushed a fix for the Windows CI build failures. Root cause: TestFramework.UnitTests is not included in NonWindowsTests.slnf, so Linux/macOS CI never builds this project. Windows CI builds the full solution with -p:TreatWarningsAsErrors=true (via eng/common/tools.ps1), which elevated two analyzer warnings to errors:

• IDE0017 (object initialization): separate attribute.BackoffType = ... assignment after construction → merged into object initializer
• IDE0008 (explicit type): var firstRunResults = new[] { ... } and var outcome = ternary where type is not apparent → changed to explicit TestResult[] and UnitTestOutcome

Build now passes locally with TreatWarningsAsErrors=true: 0 warnings, 0 errors.

Note

🔒 Integrity filter blocked 9 items

The following items were blocked because they don't meet the GitHub integrity level.

• #7457 search_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #7345 search_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #7773 search_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #4931 search_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #7542 search_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #6950 search_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #7680 search_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #3499 search_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #6719 search_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".

To allow these resources, lower min-integrity in your GitHub frontmatter:

tools:
  github:
    min-integrity: approved  # merged | approved | unapproved | none

Generated by Daily Test Improver · ● 12.2M · ◷

[Copilot]

Copilot's findings

• Files reviewed: 1/1 changed files
• Comments generated: 0 new