add_test(test1 ${CMAKE_COMMAND} -E echo test1)
set_tests_properties(test1 PROPERTIES LABELS "foo")

add_test(test2 ${CMAKE_COMMAND} -E echo test2)
set_tests_properties(test2 PROPERTIES LABELS "bar")

add_test(test3 ${CMAKE_COMMAND} -E echo test3)
set_tests_properties(test3 PROPERTIES LABELS "foo;bar")