[main] Update dependencies from microsoft/testfx

[dotnet-maestro]

This pull request updates the following dependencies

From https://github.com/microsoft/testfx

• Subscription: 6b3b8571-4059-4db5-9b07-cd5e649ae2cc
• Build: 20260905.2 (330665)
• Date Produced: September 5, 2026 10:52:30 PM UTC
• Commit: a179d7cba3416133a4b3f161093f7636bdb778fa
• Branch: main

• Dependency Updates:
  • From 2.5.0-preview.26454.15 to 2.5.0-preview.26455.2
    • Microsoft.Testing.Platform
  • From 4.5.0-preview.26454.15 to 4.5.0-preview.26455.2
    • MSTest

[microsoft-github-policy-service]

Auto-approve

[Copilot]

🟢 Approval recommended

The version and dependency metadata updates are complete and internally consistent.

Pull request overview

Updates MSTest and Microsoft.Testing.Platform dependencies to build 20260905.2.

Changes:

• Bumps MSTest to 4.5.0-preview.26455.2.
• Bumps Microsoft.Testing.Platform to 2.5.0-preview.26455.2.
• Synchronizes dependency metadata with commit a179d7cba3.

File summaries

File	Description
eng/Versions.props	Updates package version properties.
eng/Version.Details.xml	Updates dependency versions and commit SHAs.

Review details

• Files reviewed: 2/2 changed files
• Comments generated: 0
• Review effort level: Balanced

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[Copilot]

🟢 Approval recommended

The dependency versions and source commit are consistent across both metadata files.

Review details

• Files reviewed: 2/2 changed files
• Comments generated: 0 new
• Review effort level: Balanced

[github-actions]

Pipeline Test Triage — Final Resolution (build [1586130]((dev.azure.com/redacted)

Status: Final analysis of the completed microsoft.testfx build. Evidence is complete (evidenceIncomplete: false).

Affected leg: Windows Release only (Linux Release and macOS Release passed cleanly for this test).

Test: Microsoft.Testing.Platform.Acceptance.IntegrationTests.ExitOnProcessExitTests.ExitOnProcessExit_Succeed ("net10.0")

Signature: Attempt 1 failed with System.IO.IOException: The process cannot access the file ...\ExecutionTests\bin\Release\net10.0\PID because it is being used by another process. while reading the test-produced PID marker file. Attempt 2 passed cleanly with the same TFM/leg — this is a proven fail-then-pass recovery within this single build (native JUnit retry records: attempt 1 failed, attempt 2 passed).

Historical correlation: Checked up to 12 completed builds from the previous 30 days (history.json, incomplete: false). No prior Windows-leg failures of this test were found in that window, so this does not currently meet the durable recurrence threshold (requires ≥2 independent builds/commits with the same signature, or a concrete deterministic defect).

Assessment: Likely an environmental file-locking timing issue on Windows (the test reads a PID file immediately after process exit; the OS/AV may briefly still hold a file handle), consistent with a one-off flake rather than a stable product regression. No crash dumps or diagnostics were collected for this build (diagnosticCount: 0).

Confidence: Medium — the fail-then-pass pattern is clear, but a single occurrence with no historical recurrence is below the issue-creation bar per triage policy.

Next step: No action required for this PR; the retry already recovered it. If this signature recurs in a future build/commit, escalate then (link this build for reference).

🤖 Automated content by GitHub Copilot. Generated by the Pipeline Test Triage workflow. · auto · 55.1 AIC · ⌖ 2.2 AIC · ⊞ 9.3K · [◷]( · ◷)

[Copilot]

🟢 Approval recommended

The dependency versions and source SHAs are consistent with the referenced build.

Review details

• Files reviewed: 2/2 changed files
• Comments generated: 0 new
• Review effort level: Balanced