if(NOT PROJECT_BUILD AND PROJECT_ENABLE_TESTING)
  if(NOT PROJECT_IS_MINGW OR CMAKE_HOST_WIN32)
    ExternalProject_Add(gtest_project
      PREFIX external
      URL ${PROJECT_3RD_PARTY_DIR}/googletest-${GTEST_VERSION}.tar.gz
      URL_HASH SHA256=8ad598c73ad796e0d8280b082cebd82a630d73e73cd3c70057938a6501bba5d7
      LIST_SEPARATOR |
      CMAKE_ARGS ${PROJECT_EXTERNAL_CMAKE_FLAGS}
        -DBUILD_SHARED_LIBS=${PROJECT_BUILD_SHARED_LIBS}
        -DBUILD_STATIC_LIBS=ON
    )

    set(PROJECT_DEPENDENCIES 
      ${PROJECT_DEPENDENCIES}
      gtest_project
    )
  endif()
endif()