Visual Studio 2010 does not detect new unit tests

Question

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

However, if I write a new unit test, it is not picked up by the environment - in other words, I can not find it in the test list editor, running all the tests or elsewhere. If I unload the project and then reload it; A new test is available to run.

When I add a unit test, I just add a new method to an existing TestClass and decorate it with the [TestMethod] attribute - nothing unusual.

What could be causing this behavior, and how can I make it work?

Answer 1

I finally understood the problem. In the "Parameters" section of "Testing Tools" → "Test Project" there is an option "Disable the background detection of test methods." It was turned on - I do not know how this happened, but removing the checkmark and restarting Visual Studio solved the problem.

Answer 2

I also had this problem when building in debug mode. When I switched it to create a release mode that fixed it for me.

Answer 3

I had a similar problem in Visual Studio 2012, however none of the solutions worked. I am developing a 64-bit application, and the solution was to choose: -

Test -> Test Settings -> Default Processor Architecture -> X64 

Answer 4

I had this problem and option 2 below fixed it for me.

• Delete any app.config file (not sure why, but on one of the MS forums there are several such posts with this solution) and

• Make sure that the project is configured to build in the configuration properties of the solution!