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  • Chris Kang thinks this is interesting:

If markers aren’t registered, they won’t show up in the --markers list. With them registered, they show up in the list, and if you use --strict, any misspelled or unregistered markers show up as an error.

From

Cover of Python Testing with pytest

Note

Because these markers are registered in pytest.init, if you have a miss-spelled marker in your test code, they will be reported as non-registered marker. These can be fixed easily without any concern that they will be missed.