def test_common_prefix(self):
        """Legitimate settings with common prefixes should not fail validation."""
        test_configs = (
            {'docs_dir': 'docs', 'site_dir': 'docs-site'},
            {'docs_dir': 'site-docs', 'site_dir': 'site'},
        )

        for test_config in test_configs:
            with self.subTest(test_config):
                self.get_config(self.Schema, test_config)
Legitimate settings with common prefixes should not fail validation.
mkdocs/tests/config/config_options_legacy_tests.py