[CI] Deprecations in `pytest==7.0.0` make tests fail

[abravalheri]

Pytest 7 that just came out a few hours ago is currently issuing a deprecation warning for pytest-flake8, which makes setuptools tests to fail:

$ tox
...
...
E   pytest.PytestDeprecationWarning: <class 'pytest_flake8.Flake8Item'> is not using a cooperative constructor and only takes {'fspath', 'parent'}.
E   See https://docs.pytest.org/en/stable/deprecations.html#constructors-of-custom-pytest-node-subclasses-should-take-kwargs for more details.
...
...
E   pytest.PytestRemovedIn8Warning: The (fspath: py.path.local) argument to Flake8Item is deprecated. Please use the (path: pathlib.Path) argument instead.
E   See https://docs.pytest.org/en/latest/deprecations.html#fspath-argument-for-node-constructors-replaced-with-pathlib-path

This problem seems to be already reported in the project issue tracker: tholo/pytest-flake8#83.

As a temporary workaround I believe we can take one of the following approaches:

1. Ignore those specific warnings in pytest.ini
2. Disable temporarily pytest-flake8
3. Add a version cap to the pytest test dependency.

Probably the first approach is the most straight forward?

[abravalheri]

This issue also seems to apply to pytest-perf:

.tox/python/lib/python3.8/site-packages/pytest_perf/plugin.py:21: in pytest_collect_file
    return File.from_parent(parent, fspath=path)
...
E   pytest.PytestRemovedIn8Warning: The (fspath: py.path.local) argument to File is deprecated. Please use the (path: pathlib.Path) argument instead.
E   See https://docs.pytest.org/en/latest/deprecations.html#fspath-argument-for-node-constructors-replaced-with-pathlib-path

[jaraco]

This issue probably affects every project based on jaraco/skeleton. Maybe it would be best to address it there.

[jaraco]

The issue also affects pytest-black and pytest-mypy, but those are still disabled on this project. It may also affect pytest-checkdocs. Confirmed pytest-checkdocs is not affected.

[jaraco]

Reported the issue to jaraco/skeleton#57.

[jaraco]

Merged as 8c0228f.

[jaraco]

I'm addressing a follow-up issue in pytest-dev/pytest#9616.