Is there a way to run pytest-based, non-ROS test cases (so that I don't need rostest) via Catkin?

• Ideally, I'm hoping there's something equivalent of catkin_add_nosetests (docs.ros.org) that runs unittest/nosetest-based, non-ROS or ROS-based tests via Catkin.
• Alternatively, if there isn't such a one-stop solution, I'm open for workaround.
  • I know colcon, the next gen build tool, supports pytest built-in. I'm interested in that direction but I also have userbase that are stuck with Catkin.

ros_pytest provides a way to run rostest for the test cases that are built on pytest framework. That is nice, but not all tests should require ROS. I want to utilize Catkin's feature to run the tests in all federated packages for both ROS-based and non-ROS-based test cases.