Bug report

Bug description:

When running the test suite on my Mac, it always complains I don't have an OS X gui process running. I don't know how to remedy that, but I do know that I have XQuartz running, as the DISPLAY environment variable is set. The test suite should fall back to using X for tkinter and ttk unit tests if available.

CPython versions tested on:

CPython main branch

Operating systems tested on:

macOS

Linked PRs

• gh-123155: On Darwin, fall back to X if DISPLAY is set #123156