Including CTest explicitly

enable_test() seems to include CTest framework in the CMakeLists.txt but
that would result in inconsistencies and CTest framework will not be
able to find DartConfiguration file or MemCheck tool.

Including CTest framework explicitely in the CMakeLists.txt seems to
solve the issue.

Author: Hasnain Virk

UNITTESTS/CMakeLists.txt

@@ -59,7 +59,7 @@ target_include_directories(gmock_main SYSTEM BEFORE INTERFACE
 # TESTING
 ####################
 
-enable_testing()
+include(CTest)
 
 set_property(DIRECTORY APPEND PROPERTY ADDITIONAL_MAKE_CLEAN_FILES
   "${CMAKE_BINARY_DIR}/Testing"