NUnit 3 Test Adapter - Visual Studio Marketplace
marketplace.visualstudio.com › itemsApr 7, 2015 · The NUnit3TestAdapter extension works with the Visual Studio Unit Test window to allow integrated test execution under Visual Studio 2012 and newer. Note you can use the nuget adapter version, which will install into your solution, and makes it easier to run your tests on CI servers. In that case you don't need to install the vsix.
Installation | NUnit Docs
docs.nunit.org › articles › nunitIn Visual Studio, from the Tools menu, select NuGet Package Manager | Manage NuGet packages for solution... Open the Browser tab, and Scroll or use search to locate the NUnit and NUnit.Console packages. NUnit and NUnit.Console Install both packages. The NUnit package should be referenced by each of your test assemblies, but not by any others.