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This is my suggested fix for rosbag2 tests failing when run in parallel with other tests.
This PR relies on
Add 'runner' option to ament_add_gmock / nose ament/ament_cmake#177MergedAdd isolated gmock test ament_cmake_ros#4MergedUsing the 'ros_isolated' version of ament_add_gmock means that the tests are given a ROS_DOMAIN_ID before they're run so they won't see ROS traffic from other tests.
I've checked this by running the rosbag2 tests in a loop while I run
I didn't change all of the tests to use the ros_isolated version - only the ones that were failing because of interference.