ApplePersistenceIgnoreState warning when running tests on macOS

2020-02-09 17:10:38.319 tst_game[24636:1929252] ApplePersistenceIgnoreState: Existing state will not be touched. New state will be written to (null)

The answers on this question suggest disabling it with a console command, but I'm not sure what that'd be for Qt applications:

https://stackoverflow.com/questions/18733965/annoying-message-when-opening-windows-from-python-on-os-x-10-8

When this was reported against Python, they suggested it was the responsibility of the UI toolkits:

https://bugs.python.org/issue32909