[Flaky Test] Microsoft.Build.UnitTests.XMakeAppTests.GetCommandLineQuotedExeOnPath #14196

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

flaky-test-id: Microsoft.Build.UnitTests.XMakeAppTests.GetCommandLineQuotedExeOnPath

Evidence

This test has been flagged as flaky by the automated flaky-test detector.

• Distinct sources: 3 (rolling main builds only)
• Rolling build IDs: 1464065, 1475010, 1481906
• Total failures: 4
• Distinct error signatures: 4 (indicating non-deterministic failure modes)
• Legs: FullOnWindows, FullOnWindows Release
• TFMs: net472
• Assembly: Microsoft.Build.CommandLine.UnitTests
• First seen: 2026-06-15
• Last seen: 2026-06-25
• Sample build: 1464065

Representative error

Shouldly.ShouldAssertException : output
    should contain (case insensitive comparison)
"D:\a\_work\1\s\artifacts\bin\Microsoft.Build.CommandLine.UnitTests\Debug\net472\MSBuild.exe /v:diag C:\Windows\system32\notepad.exe"
    but was actually
"MSBuild version 18.9.0-ci-26315-01+4f9fffae9 for .NET Framework ..."

Location

• Fully-qualified name: Microsoft.Build.UnitTests.XMakeAppTests.GetCommandLineQuotedExeOnPath
• Assembly: Microsoft.Build.CommandLine.UnitTests
• Source: src/MSBuild.UnitTests/XMake_Tests.cs (line ~1317)
• Project: src/MSBuild.UnitTests/Microsoft.Build.CommandLine.UnitTests.csproj

Next steps

This test will be quarantined via [ActiveIssue("https://github.com/dotnet/msbuild/issues/<this_issue>")] (from Microsoft.DotNet.XUnitV3Extensions, namespace Xunit) — not [Fact(Skip=...)] — until the underlying nondeterminism is fixed. The quarantine pipeline (definition 344, azure-pipelines/quarantine.yml) will continue running this test on Windows/Linux/macOS across main's rolling builds to gather failure signal over time.

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