The error message says: > `pytest.py`: unrecognized arguments: -o cache_dir=... I assume you are using an older version of `pytest` since this command line argument was only added in version [3.2.0](https://docs.pytest.org/en/latest/changelog.html#pytest-3-2-0-2017-07-30). Please check that you have followed the [instructions](https://github.com/ros2/ros2/wiki/Linux-Development-Setup#how-to-setup-the-development-environment) which mention to install the latest version via pip. --- [Visit Topic](https://discourse.ros.org/t/ament-build-test-failed/3398/12) or reply to this email to respond. If you do not want to receive messages from ros-users please use the unsubscribe link below. If you use the one above, you will stop all of ros-users from receiving updates. ______________________________________________________________________________ ros-users mailing list ros-users@lists.ros.org http://lists.ros.org/mailman/listinfo/ros-users Unsubscribe: