CSharp-Coder

Learn test-driven development in C# with xUnit. Master the red-green-refactor cycle, best practices, and runnable examples. Start writing better tests today! Test-driven development in C# (TDD) is one of the most valuable skills a .NET developer can master in 2026. Instead of writing code first and tests later, test driven development C# flips the process: you write a failing test, write just enough code to pass it, then refactor. The result is cleaner, more reliable, and easier-to-maintain software. In this tutorial, you'll learn how to do TDD in C# with xUnit, the most popular unit testing framework in the modern .NET ecosystem, with practical, runnable code examples you can try right now. What Is Test-Driven Development in C#? Test-driven development is a software design methodology where you write automated tests before writing the production code that makes them pass. TDD was popularized by Kent Beck and is built around a short, repeatable loop called red-green-refact...