I want to run tests from a console like this (being in any directory, the DLL file can be for a different .NET version):
$ nunit3-console test.dll
I realize this thread is a bit dated, but here is how I run a specific SINGLE test.
Example (paths need to be adjusted to point to your specific files):
& "C:\Program Files (x86)\NUnit.org\nunit-console\nunit3-console.exe" --test=MyApp.Mvc.WebTests.CardsControllerTests.TheNameOfYourTestMethod "c:\src\MyApp.Mvc.WebTests\bin\Debug\MyApp.Mvc.WebTests.dll"
Hope this helps someone.