Visual Studio 2010 does not discover new unit tests

Question

I am writing some unit tests in Visual Studio 2010. I can run all tests by using "Run all Tests in Current Context".

However, if I write a new unit test, it does not get picked up by the environment - in other words, I am not able to find it in Test List Editor, by running all tests, or anywhere else. If I unload the project and then reload it; the new test is available to run.

When I am adding a unit test, I simply add a new method to an already existing TestClass and decorating it with [TestMethod] attribute - nothing fancy.

What might be causing this behaviour, and how do I make it work ?

Answer 1

Check out http://blogs.msdn.com/vstsqualitytools/archive/2010/03/03/run-tests-in-current-context-after-upgrading-from-visual-studio-2010-beta2.aspx

Answer 2

I've had this problem as well when building in debug mode. When I switched it to build in release mode that fixed it for me.

Answer 3

I finally figured out the problem. In Options under Test Tools -> Test Project, there is an option "Disable background discovery of test methods". It was turned on - I do not know how that happened, but removing the checkmark and restarting Visual Studio solved the problem.