[Flaky Test] Microsoft.Build.Engine.UnitTests.MSBuildServer_Tests.TransientBuildDoesNotAdoptResidentSidecars

[github-actions]

Flaky-test key (automated de-duplication — do not edit):

flaky-test-id: Microsoft.Build.Engine.UnitTests.MSBuildServer_Tests.TransientBuildDoesNotAdoptResidentSidecars

Evidence

The test TransientBuildDoesNotAdoptResidentSidecars has been observed failing intermittently across multiple independent sources.

• Distinct sources: 3 (2 approved PRs + 1 rolling build)
• PRs: Fix argument forwarding and stage logging in eng/build.ps1 #14767, Revise temp path handling in README #14834
• Rolling builds: 1560446
• Distinct error signatures: 2 — non-deterministic
• Legs: CoreOnMac, FullOnWindows Release
• TFMs: net11.0
• Assembly: Microsoft.Build.CommandLine.UnitTests
• Source: src/MSBuild.UnitTests/MSBuildServer_Tests.cs
• First seen: 2026-08-20 | Last seen: 2026-08-25
• Sample error: Assert.Equal() Failure: Values differ — Expected: 1, Actual: 2
• Sample build: 1560398

Action

This test will be quarantined via [ActiveIssue("https://github.com/dotnet/msbuild/issues/<issue-number>")] (from Microsoft.DotNet.XUnitV3Extensions, namespace Xunit) in a follow-up automated PR, once this issue has a number. The underlying nondeterminism should be fixed by the auto-fixer workflow or a human contributor.

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