How to Set Path Environment Variable using CMake and Visual Studio to Run Test

I am using CMake to generate Visual Studio project files. I want to run the test executable after setting the PATH environment variable so that it is able to load the required dll. I tried as per the discussion at http://www.mail-archive.com/cmake@cmake.org/msg21493.html but it does not work.

Have you used CMake with Visual Studio for this purpose? Please share your experiences.

Also, I find no easy way to debug my CMake script, for example to see what value it assigns to the PATH variable. Setting CMake verbose with CMAKE_VERBOSE_MAKEFILE does not help. How would I go about debugging it myself?