xunit-testing-patterns

xUnit unit tests in C# use `Fact` for single tests and `Theory` with `MemberData` for parameterized tests. Structure tests with clear naming, use assertions to verify behavior, and organize them by class or feature for maintainability.

Use `IClassFixture` for per-test setup, `ICollectionFixture` for shared state across multiple tests, and `IAsyncLifetime` for async initialization and cleanup. This ensures efficient resource management and consistent test data across test runs.

Integration tests validate application services by combining xUnit fixtures with mocking frameworks like NSubstitute or Moq. Structure tests across TestBase, Application, and Domain layers following ABP Framework conventions to test real interactions with dependencies.

Yes. xUnit integrates with .NET dependency injection to enable interface-first testing. Mock interfaces using NSubstitute or Moq, set up test data seeders, and organize tests by layer—TestBase for common patterns, Application for service tests—following ABP conventions.

Combine NSubstitute or Moq for isolating units under test with Shouldly for readable, expressive assertions. Use consistent naming and setup patterns across tests to enforce maintainability and align with xUnit attributes and integration testing pipelines.

Yes. ABP projects benefit from structured test organization: TestBase for shared fixtures and test data constants, Domain and Application layers for unit and integration tests, and seed contributors for consistent test data. This codifies conventions and enables scalable test coverage.