csharp-testing

To write reliable C# integration tests, use xUnit with WebApplicationFactory to run ASP.NET Core endpoints in-memory and FluentAssertions to verify outcomes. This combination isolates behavior and avoids implementation-detail assertions to reduce flakiness as your codebase grows.

The best way to isolate dependencies during .NET unit testing is using mocking libraries like NSubstitute or Moq. These tools isolate the system under test, allowing you to structure tests with Arrange-Act-Assert and precisely verify interactions without hitting real infrastructure.

Testcontainers works for .NET repository tests by spinning up real Postgres Docker containers during the test run. This infrastructure-aware approach validates actual database interactions, replacing flaky mocks with reliable, ephemeral Postgres instances managed within xUnit test suites.

Yes, you can use FluentAssertions with xUnit to build readable .NET test suites. Combined with builder patterns like OrderBuilder and consistent folder conventions, this approach keeps test data structured and scales test code cleanly across large services and repositories.

Your C# test suite likely fails intermittently due to implementation-detail assertions or reliance on shared state instead of behavior-focused verification. Diagnose flaky behavior by restructuring tests with Arrange-Act-Assert, isolating dependencies via NSubstitute, and using WebApplicationFactory for realistic environments.

Yes, csharp-testing supports both unit and infrastructure-aware integration tests. It provides patterns for behavior-focused unit testing with NSubstitute and realistic integration testing using WebApplicationFactory and Testcontainers, ensuring consistent test naming and clean validation across .NET projects.