def test_plugin_prevent_register_stepwise_on_cacheprovider_unregister(
        self, pytestpm: PytestPluginManager
    ) -> None:
        """From PR #4304: The only way to unregister a module is documented at
        the end of https://docs.pytest.org/en/stable/how-to/plugins.html.

        When unregister cacheprovider, then unregister stepwise too.
        """
        pytestpm.register(42, name="cacheprovider")
        pytestpm.register(43, name="stepwise")
        l1 = pytestpm.get_plugins()
        assert 42 in l1
        assert 43 in l1
        pytestpm.consider_preparse(["xyz", "-p", "no:cacheprovider"])
        l2 = pytestpm.get_plugins()
        assert 42 not in l2
        assert 43 not in l2
From PR #4304: The only way to unregister a module is documented at
        the end of https://docs.pytest.org/en/stable/how-to/plugins.html.

        When unregister cacheprovider, then unregister stepwise too.
        
testing/test_pluginmanager.py