PytestUnknownMarkWarning

[dizcology]

Generated GAPIC package's unit tests issue the following warning: (with the latest version of the generator)

PytestUnknownMarkWarning: Unknown pytest.mark.asyncio - is this a typo?  You can register custom marks to avoid this warning - for details, see https://docs.pytest.org/en/latest/mark.html
    @pytest.mark.asyncio