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

Answer 1

Just to add my $.02 here, I ran into a similar issue just yesterday, where 168 of my tests were missing. I tried most everything in this post - most especially making sure my version(s) of NUnit were the same - all to no avail. I then remembered that I had my tests divided into playlists; and these do not update automatically as you add new tests. So, when I deleted the playlists, BAM!, all of my tests were back once more.

Answer 2

I also found that when I uninstalled nunit v3.2.1, the nunit framework reference for v3.2.1 was still in my project in solution explorer. Solution Explorer > ProjectName > References

If you right click it will show the version. Remove this Then Right click on References > Add Reference.

Search for the version 2.x version and add then rebuild solution.

That worked for me!

Answer 3

I had some msbuild.exe processes that were hung. I don't know if that was my problem or not, but it took me a lot of trail and error with reinstalling various NUnit adaptors before I found the hung processes.

Answer 4

My test assembly is 64-bit. From the menu bar at the top of visual studio 2012, I was able to select 'Test' -> 'Test Settings' -> 'Default Processor Architecture' -> 'X64'. After a 'Rebuild Solution' from the 'Build' menu, I was able to see all of my tests in test explorer. Hopefully this helps someone else in the future =D.

Answer 5

If you're using a NUnit3+ version, there is a new Test Adapter available.

Go to "Tools -> Extensions and Updates -> Online" and search for "NUnit3 Test Adapter" and then install.

Answer 6

One other cause to this problem is if you open a project from a mapped drive - Visual Studio handles such projects properly, but apparently Nunit doesn't support them.

Copying the project to a physical fixed the issue.