There is a variable BUICD_TESTING from CMake here that you can use.
Follow these steps:
IF (BUILD_TESTING)
add_executable(TestOne TestOne.cpp)
target_link_libraries(TestOne my_library)
add_test(TestOne TestOne)
set_tests_properties (TestOne
PROPERTIES PASS_REGULAR_EXPRESSION "Passed")
ENDIF(BUILD_TESTING)
, cmake-gui, ccmake cmake -DBUILD_TESTING = ON. , , , CMake.