Visual Studio 2013 doesn't discover unit tests

Question

Some things I've noticed I have to do from time to time to get tests to show up properly.

1. If your solution is in a protected drive that you need administrator access to read/write, sometimes only a portion of the tests come up. Definitely run VS as administrator in that case.

2. If your solution is 64 bit, make sure that Test > Test Settings > Default Processor Architecture is set to x64. Sometimes it gets set to x86. Set it to x64, then rebuild.

3. Sometimes just restarting Visual Studio does the trick because the test explorer will start up again.

4. Don't forget to actually build the test project/solution. (If you want it to get built with the rest of the projects, right-click on your solution > Properties > Configuration Properties > Configuration > check the "Build" box for your test project)

5. Ensure the tests are in a public section of your test class

If you using NUnit, make sure to download NUnit Adapter first.

Go to Tools → Extensions and Updates… → Online → search for "NUnit Test Adapter".

Make sure your test class is public so it can be found. And if you're referencing another class, make sure of the same.

Also, sometimes if you have no Asserts or you're not decorating the test with a [TestMethod], a test might not be recognized.

2 more things: 1) Async unit tests act funny at best, and none at all at worst. Have a look at this article by Stephen Cleary and keep from there if it interests you.

2) If you use NUnit and you run into the same issues, keep in mind it's [TestCase] for Nunit, instead of [TestMethod]

Having said the above, here's an article I've posted on the code project, with both MSTest & NUnit, in case you want to give it a spin and make sure you're not missing anything.

I had the same issue but none of the other solutions worked. Turns out that I was using the NUnit 3 framework with the 2 adapter.

If you're using NUnit 3, go to Extensions and Updates and install the NUnit3 Test Adapter.