message: gtest: Added custom target for all unit tests
  Create a target which depends on all unit test executables for ease of
  building/running.
diff: @@ -17,3 +17,11 @@ add_executable(json_tests json/json_tests.cxx)
  target_link_libraries(json_tests GTest::GTest GTest::Main)
  target_include_directories(json_tests PRIVATE "${UPM_COMMON_HEADER_DIRS}/")
  gtest_add_tests(json_tests "" AUTO)
  +
  +# Add a custom target for unit tests
  +add_custom_target(tests-unit ALL
  + DEPENDS
  + utilities_tests
  + json_tests
  + COMMENT "UPM unit test collection")
  +
  