xUnit.net
xUnit.net is an open .NET unit-testing framework with facts, theories, data-driven tests, fixtures, and broad runner integration.
Why use it
C# game tools, backends, and standalone assemblies use concise conventions and parallel execution.
Where it fits
Use testing, performance, accessibility, and diagnostic tools to remove problems players will notice.
What to check
Engine editor and scene tests need adapters, and default parallelism can expose shared-state problems.