This QUnit support for ASP.NET MVC. You may also use it for ASP.NET Webforms, but the css folder will not be on the default location.
QUnit is especially useful for regression testing: Whenever a bug is reported, write a test that asserts the existence of that particular bug. Then fix it and commit both. Every time you work on the code again, run the tests. If the bug comes up again - a regression - you'll spot it immediately and know how to fix it, because you know what code you just changed.
Having good unit test coverage makes safe refactoring easy and cheap. You can run the tests after each small refactoring step and always know what change broke something.
Install-Package QUnit-MVC -Version 1.6.2
dotnet add package QUnit-MVC --version 1.6.2
<PackageReference Include="QUnit-MVC" Version="1.6.2" />
paket add QUnit-MVC --version 1.6.2
This package has no dependencies.