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This skill provides a comprehensive framework for writing clean, maintainable, and robust unit tests in the .NET ecosystem. By enforcing the Arrange-Act-Assert (AAA) pattern and consistent naming conventions, it helps developers create predictable test suites that are easy to read and refactor. It includes specialized guidance for mocking dependencies with Moq, making assertions readable with FluentAssertions, and ensuring full coverage of common edge cases like null responses, empty lists, and validation failures in backend services.