As with the other testing frameworks that are part of Visual Studio, your first step in creating xUnit tests is to use Add > New Project to add a testing project (you can do that either from Visual ...

GitHub Copilot testing for .NET in Visual Studio 2026 v18.3 can generate tests for the xUnit, NUnit, and MSTest test frameworks.

Let me be clear about the new .NET Core testing framework, xUnit: It's an alternative, not a replacement for MSTest, the .NET Core version of the framework you're familiar with from earlier versions ...