csharp-testing

To write C# unit tests with xUnit and FluentAssertions, you create a test project, reference your core services, and use FluentAssertions for expressive assertions. This approach ensures readable tests and isolates components using mocking frameworks like NSubstitute or Moq.

The best way to set up .NET integration testing with Testcontainers is combining it with WebApplicationFactory. This configures end-to-end scenarios by spinning up realistic dependencies in Docker containers, validating your application's full request lifecycle.

You generate realistic test data for C# automated tests using the Bogus library. Bogus programmatically builds populated objects with randomized, domain-specific values, ensuring your unit and integration tests run against varied and representative inputs.

Both Moq and NSubstitute effectively mock dependencies in .NET to isolate components during unit testing. NSubstitute offers a more natural syntax, while Moq uses explicit setup calls, letting you choose based on your team's preferred syntax style.

You need WebApplicationFactory for .NET testing when executing integration tests that require an in-memory web server. It boots up your application pipeline, allowing end-to-end HTTP request validation without deploying to a live environment.