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I had this happen with a gtest in ROS2 Rolling. (Which is very similar to ROS2 Galactic at this point.)

It was fixed by adding the rclcpp::init(argc, argv); here:

int main(int argc, char** argv)
{
  rclcpp::init(argc, argv);
  ::testing::InitGoogleTest(&argc, argv);
  return RUN_ALL_TESTS();
}

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