xUnit.net

xUnit.net is the modern, open-source unit testing tool for .NET (C#, F#, VB). It is chosen by Microsoft/dotnet for their own repositories.

When to Use

• Modern .NET Core Unit Testing: The modern, opinionated, community-preferred testing framework for C# and ASP.NET Core applications.
• Isolated Clean Test Execution: Enforcing a new class instance for every single test method to guarantee zero state contamination.
• Theory-Driven Parameterized Tests: Running tests across inline data ([InlineData]), member data, and class data sources.
• Constructor-Based Test Setup: Replacing [SetUp] attributes with standard C# object-oriented constructors and IDisposable.

Quick Start

using Xunit;