In Visual Studio the project "RUN_TESTS" does not work anymore. Most of the tests fail with an undefined error. The tests work correctly if started "by hand" in Visual Studio or when starting them from command line (after the path variable is correctly set).
I assume that the problem was introduced when introducing the feature that MITK solutions does not need a startVS*.bat anymore. Seems like the "RUN_TESTS" project is not started with the correct path setting and therefor the test driver fail.