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

Answer 1

Check for NUnit versions mismatch. The currently available NUnit Test Adapter only works for NUnit version 2.6.4 and below. To downgrade NUnit from version 3.x go to Package Manager Console > update-package NUnit -version 2.6.4

http://jeremybytes.blogspot.co.ke/2015/11/review-of-unit-testing-makes-me-faster.html