Analyzers 2.1.0 2026 September 12

Today, we're shipping two new releases:

• xUnit.net Core Framework v3 4.0.1 (release notes)
• xUnit.net Analyzers 2.1.0

It's been 4 weeks since the release of 2.0.0.

As always, we'd like to thank all the users who contributed to the success of xUnit.net through usage, feedback, and code. 🎉

Release Notes

These release notes are a comprehensive list of changes from 2.0.0 to 2.1.0.

Usage Analyzers

• We have updated xUnit1005 to add support for CulturedFactAttribute and CulturedTheoryAttribute.

• We have updated xUnit1037, xUnit1038, xUnit1039, and xUnit1040 to support tuples (in addition to TheoryData<> and TheoryDataRow<>). xunit/xunit#3617

• We have updated xUnit1041 to add support for AssemblyFixtureAttribute<T>. xunit/xunit#3619

• We have updated xUnit1044 and xUnit1054 to add support for ClassDataAttribute<T>. xunit/xunit#3622

• We have updated the message for xUnit1048, which still currently reference to the release of v3 as something happening in the future.

Assertion Analyzers

Extensibility Analyzers

• We have updated xUnit3005 to add support for:

  • CollectionBehaviorAttribute<T>
  • RegisterConsoleResultWriterAttribute<T>
  • RegisterMicrosoftTestingPlatformResultWriterAttribute<T>
  • RegisterResultWriterAttribute<T>
  • RegisterRunnerReportAttribute<T>
  • TestCaseOrdererAttribute<T>
  • TestClassOrdererAttribute<T>
  • TestCollectionOrdererAttribute<T>
  • TestMethodOrdererAttribute<T>
  • TestPipelineStartupAttribute<T>

  xunit/xunit#3622

• BUG: We have fixed an issue with xUnit3005 which was causing false positives for legal assembly fixture parameters (namely, IMessageSink diagnosticMessageSink, ITestContextAccessor accessor, and ITestOutputHelper outputHelper). xunit/xunit#3618