Move libraries tests to xunit3#125019

Draft

agocke wants to merge 61 commits intodotnet:mainfrom

Commits on Jan 16, 2026

Switch to xunit3 for single file
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Commits on Jan 17, 2026

Switch to xunit3 unconditionally
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Commits on Jan 18, 2026

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WIP
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Commits on Jan 21, 2026

WIP
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WIP
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Commits on Feb 25, 2026

Commits on Feb 28, 2026

Backflow from https://github.com/dotnet/dotnet / 29e2749 build 303682
dotnet-maestro[bot]
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Update dependencies from build 303682
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Merge remote-tracking branch 'upstream/darc-main-d4f68257-b103-4c5b-8890-3fb7d08010e4' into xunit3
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Merge remote-tracking branch 'upstream/main' into xunit3
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Merge remote-tracking branch 'upstream/main' into xunit3
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Fix some more uses of the ConditionalTheory nameof overload
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Run xunit v3 tests as executables instead of via dotnet exec

agocke
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Replace SkipTestException with Xunit.Sdk.SkipException

agocke
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Convert simple if/throw SkipException patterns to Assert.SkipWhen/SkipUnless

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Commits on Mar 2, 2026

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Commits on Mar 20, 2026

Use Microsoft.DotNet.XUnitAssert for .NETCoreApp targets

agocke
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Merge upstream/main into xunit3

agocke
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Merge upstream/main into xunit3

agocke
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Commits on Mar 21, 2026

Fix CI build failures from upstream merge

agocke
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