dotnet-xunit
dotnet-xunit
xUnit v3 testing framework features for .NET. Covers [Fact] and [Theory] attributes, test fixtures (IClassFixture, ICollectionFixture), parallel execution configuration, IAsyncLifetime for async setup/teardown, custom assertions, and xUnit analyzers. Includes v2 compatibility notes where behavior differs.
Version assumptions: xUnit v3 primary (.NET 8.0+ baseline). Where v3 behavior differs from v2, compatibility notes are provided inline. xUnit v2 remains widely used; many projects will encounter both versions during migration.
Scope
- [Fact] and [Theory] test attributes and data sources
- Test fixtures (IClassFixture, ICollectionFixture) and shared context
- Parallel execution configuration and collection ordering
- IAsyncLifetime for async setup/teardown
- xUnit analyzers and custom assertions
- xUnit v3 migration from v2 (TheoryDataRow, ValueTask lifecycle)
Out of scope
- Test project scaffolding -- see [skill:dotnet-add-testing]
- Testing strategy and test type decisions -- see [skill:dotnet-testing-strategy]
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