Fix CTest setup

Author: TheAssassin

Diff for: CMakeLists.txt

@@ -9,6 +9,8 @@ set(CMAKE_CXX_STANDARD_REQUIRED ON)
 add_subdirectory(lib)
 add_subdirectory(src)
 
-if (BUILD_TESTING)
-  add_subdirectory(tests)
+include(CTest)
+if(BUILD_TESTING)
+    enable_testing()
+    add_subdirectory(tests)
 endif()