NUnit Unit tests not showing in Test Explorer with Test Adapter installed

Answer 1

In my situation the 'NUnit3 Test Adapter' has been disabled. To re-enable it go to menu

Tools->Extensions and Updates...

On the left side select 'Installed'->'All'.

On the upper right corner search for 'nunit'.

If you have 'NUnit3 Test Adapter' installed, with the found item you can enable/disable it.

Answer 2

I had a working setup (for NUnit2 and NUnit3 depending on the solution, and multiple versions of Visual Studio between 2012 and 2017), and it suddenly stopped working one day: no tests detected in any solution or version of VS.

In my case, it helped to delete %localappdata%\Temp\VisualStudioTestExplorerExtensions. After a restart of VS, everything worked as before.

Answer 3

If you are using VS 2017 and .net core ,as said here, you should add references to the test framework NUnit 3.6.1, to the test runner NUnit3TestAdapter 3.8.0-alpha1 and to the test SDK Microsoft.NET.Test.Sdk 15.0.0.

Answer 4

If you are using the TestCaseSource attribute, ensure the source exists and respects the documentation, otherwise your tests will not be discovered.