[Flaky Test] Microsoft.Build.UnitTests.BinaryLoggerTests.BinaryLoggerShouldEmbedFilesViaTaskOutput #13932

Flaky test detected by automated CI scan (14-day window, 3+ independent evidence sources).

Evidence

• Distinct sources: 3 (0 PRs + 3 rolling main builds)
• Rolling builds: 1430551, 1431677, 1445471
• Legs / TFMs: CoreOnLinux / net10.0
• Assembly: Microsoft.Build.Engine.UnitTests
• First seen: 2026-05-21 | Last seen: 2026-06-02
• 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:

Fix guidance

The test writes a file via WriteLinesToFile and expects it to be embedded in the .ProjectImports.zip binary log. The intermittent empty Embedded files: suggests a race: the file may not be flushed/closed before EmbedInBinlog is processed. A minimal fix may ensure the file is written before embedding. If no concrete root cause can be identified, quarantine with:

[ActiveIssue("https://github.com/dotnet/msbuild/issues/<THIS_ISSUE>")]
[Fact]
public void BinaryLoggerShouldEmbedFilesViaTaskOutput() { ... }

(ActiveIssue is from Microsoft.DotNet.XUnitV3Extensions, namespace Xunit — not [Fact(Skip=...)])

network:
  allowed:
    - defaults
    - "dnceng.pkgs.visualstudio.com"

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