Python 3.8 adds a missing_ok argument to the method Path.unlink. This method is used in our test suite at a few places. Setting missing_ok=True may help avoiding unexpected errors in the test runs.

A PR in this direction is very welcome. As long as #3728 is open, it should be based on the drop-py-37 branch. If you would like to send a PR, please be sure to read our contribution guide and leave a short comment so that we can assign you.