[CMake] different test cases

["Jörg F. Unger"]

  I'm using cmake to add a test environment to our project (with ctest). 
Is there a possibility to generate to groups of test with different tags 
in the makefile, so that after the generation of the makefiles the user 
might say

make test or make extensiveTest?

Thanks
JFU

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         *  Dr. Jörg F. Unger                         *
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