Adopt to pytest 7.x

[wiget]

pytest 7.x deprecated few things and also dropped support for python 2.7

This change also add testing on python 3.9 and 3.10, and run flake8 on
latest python in CI

[insertjokehere]

@kevincowan @paulka - Does Shopkeep intend to keep maintaining this plugin? It would be great if this and a couple of the other open PRs could be merged to ensure the plugin isn't broken by future updates

[kloczek]

I've been tryingto test this PR against pytest 8.1.0 and looks like it pytest fails

+ PYTHONPATH=/home/tkloczko/rpmbuild/BUILDROOT/python-pytest-black-0.3.12-2.fc36.x86_64/usr/lib64/python3.9/site-packages:/home/tkloczko/rpmbuild/BUILDROOT/python-pytest-black-0.3.12-2.fc36.x86_64/usr/lib/python3.9/site-packages
+ /usr/bin/pytest -ra -m 'not network'
Traceback (most recent call last):
  File "/usr/bin/pytest", line 8, in <module>
    sys.exit(console_main())
  File "/usr/lib/python3.9/site-packages/_pytest/config/__init__.py", line 195, in console_main
    code = main()
  File "/usr/lib/python3.9/site-packages/_pytest/config/__init__.py", line 153, in main
    config = _prepareconfig(args, plugins)
  File "/usr/lib/python3.9/site-packages/_pytest/config/__init__.py", line 335, in _prepareconfig
    config = pluginmanager.hook.pytest_cmdline_parse(
  File "/usr/lib/python3.9/site-packages/pluggy/_hooks.py", line 501, in __call__
    return self._hookexec(self.name, self._hookimpls.copy(), kwargs, firstresult)
  File "/usr/lib/python3.9/site-packages/pluggy/_manager.py", line 119, in _hookexec
    return self._inner_hookexec(hook_name, methods, kwargs, firstresult)
  File "/usr/lib/python3.9/site-packages/pluggy/_callers.py", line 138, in _multicall
    raise exception.with_traceback(exception.__traceback__)
  File "/usr/lib/python3.9/site-packages/pluggy/_callers.py", line 121, in _multicall
    teardown.throw(exception)  # type: ignore[union-attr]
  File "/usr/lib/python3.9/site-packages/_pytest/helpconfig.py", line 105, in pytest_cmdline_parse
    config = yield
  File "/usr/lib/python3.9/site-packages/pluggy/_callers.py", line 102, in _multicall
    res = hook_impl.function(*args)
  File "/usr/lib/python3.9/site-packages/_pytest/config/__init__.py", line 1141, in pytest_cmdline_parse
    self.parse(args)
  File "/usr/lib/python3.9/site-packages/_pytest/config/__init__.py", line 1490, in parse
    self._preparse(args, addopts=addopts)
  File "/usr/lib/python3.9/site-packages/_pytest/config/__init__.py", line 1377, in _preparse
    self.pluginmanager.load_setuptools_entrypoints("pytest11")
  File "/usr/lib/python3.9/site-packages/pluggy/_manager.py", line 415, in load_setuptools_entrypoints
    self.register(plugin, name=ep.name)
  File "/usr/lib/python3.9/site-packages/_pytest/config/__init__.py", line 497, in register
    plugin_name = super().register(plugin, name)
  File "/usr/lib/python3.9/site-packages/pluggy/_manager.py", line 167, in register
    self._verify_hook(hook, hookimpl)
  File "/usr/lib/python3.9/site-packages/pluggy/_manager.py", line 342, in _verify_hook
    raise PluginValidationError(
pluggy._manager.PluginValidationError: Plugin 'black' for hook 'pytest_collect_file'
hookimpl definition: pytest_collect_file(file_path, path, parent)
Argument(s) {'path'} are declared in the hookimpl but can not be found in the hookspec

[wiget]

Cześć @kloczek

pytest 8.1.0 version was broken and it's yanked. Please use 8.1.1

PS: Nice to meet you again after long years.

[kloczek]

Yep with 8.1.1 everything is OK.

[jaraco]

This has been merged into coherent-oss/pytest-black and released as v0.5.0.