Modern .NET Unit Testing with xUnit v3 and TDD

Writing bug-free, maintainable software requires a solid testing foundation, yet many developers struggle with where to start or how to test real-world scenarios. This text-based course guides you through the essentials of unit testing in the modern .NET ecosystem using xUnit v3. You will transition from writing untested code to confidently designing testable .NET applications. By reading clear explanations, studying modern C# code snippets, and working through conceptual exercises, you will master Test-Driven Development (TDD), mocking dependencies, and isolating your business logic. What you'll learn: - Understand the core principles of unit testing, test lifecycles, and the AAA (Arrange, Act, Assert) pattern. - Write robust unit tests using the latest features of xUnit v3 and the modern .NET Testing Platform. - Apply Test-Driven Development (TDD) workflows to design cleaner, more modular C# code. - Mock external dependencies effectively using modern isolation frameworks and dependency injection patterns. - Test real-world ASP.NET Core applications, including MVC controllers and modern Minimal APIs. - Analyze code coverage and evaluate test quality to ensure your suite catches actual bugs. - Prepare for technical job interviews with written Q&As covering essential testing concepts and best practices. The journey begins with foundational testing terminology and setup before moving into hands-on test writing, mocking, and advanced integration scenarios with web APIs. You will finish by exploring legacy code refactoring and common interview scenarios to solidify your knowledge. This course is designed for beginner .NET developers and C# programmers who want to learn professional testing practices from scratch. No prior testing experience is required. Start reading today to build reliable .NET applications with confidence.