dotnet-testing

xUnit best practices involve using the Arrange-Act-Assert pattern, selecting [Fact] vs [Theory] with appropriate data attributes, and organizing tests with IClassFixture or ICollectionFixture to ensure maintainability and clear descriptive naming.

The best way to mock external dependencies in .NET testing is using NSubstitute, which allows you to effectively substitute external components while maintaining readable and expressive test suites.

You test ASP.NET Core applications using WebApplicationFactory for integration testing, which allows you to boot up your application in memory and test the full request pipeline end-to-end.

SQLite in-memory provides fast, lightweight database testing for .NET, while Testcontainers offers realistic integration testing using actual database engines in Docker containers for higher fidelity.

Handle async test patterns in .NET by properly awaiting asynchronous operations, testing cancellation and timeouts, and avoiding common anti-patterns highlighted by best practices to ensure robust and maintainable test suites.

Yes, FluentAssertions promotes readable and expressive assertions in .NET testing, allowing you to write clear test verification statements that integrate smoothly with xUnit and NSubstitute.