[Flaky Test] Microsoft.Build.UnitTests.BinaryLoggerTests.BinaryLoggerShouldEmbedFilesViaTaskOutput #13951

Flaky test: BinaryLoggerTests.BinaryLoggerShouldEmbedFilesViaTaskOutput

Assembly: Microsoft.Build.Engine.UnitTests

Evidence

• Distinct sources: 3 (all rolling main builds, 0 PRs)
• Rolling build IDs: 1430551, 1431677, 1445471
• Affected legs/TFMs: CoreOnLinux / net10.0
• First seen: 2026-05-21 | Last seen: 2026-06-02 (12-day spread)
• Sample build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1430551

Sample error

Shouldly.ShouldAssertException : zipArchive.Entries
    should contain an element satisfying the condition
zE.Name.EndsWith("testtaskoutputfile.txt")
    but does not

Additional Info:
    Embedded files: 

Notes

The test intermittently fails when verifying that a file produced via task output is embedded in the binary log. The embedded-files list is empty, suggesting the task output file was not created/flushed before the log was finalized (Linux/net10.0 only).

Fix guidance

Preferred fix: ensure the task output file is fully written and flushed before the binary logger finalizes, or add a synchronization point in the test.

Fallback: quarantine via [ActiveIssue("https://github.com/dotnet/msbuild/issues/NNNN")] from Microsoft.DotNet.XUnitV3Extensions (namespace Xunit) — not [Fact(Skip=...)].

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