Introduction to Unit Testing
Explore how to write and run unit tests in C# using the xUnit framework and .NET CLI. Understand the Arrange-Act-Assert pattern to verify code behavior and ensure application correctness through automated testing.
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As applications grow, manually verifying every class becomes impossible. Unit testing automates this process by verifying individual units of code in isolation. A unit is typically a single method or a specific behavior within a class.
In .NET, developers create a separate test project that references the main application code. The .NET ecosystem supports several testing frameworks, including xUnit, NUnit, and MSTest. We use xUnit for these examples because it is the default testing framework generated by modern .NET templates.
Setting up the test environment
To run tests, the .NET Command Line Interface (CLI) requires a specific project structure. We need a main application project, a separate test project, and a ...