def METHOD_NAME(self: Any) -> None:
    """
    Test Extraction with single result from query
    """
    with patch.object(GraphDatabase, 'driver'):
        extractor = Neo4jExtractor()
        extractor.init(Scoped.get_scoped_conf(conf=self.conf,
                                              scope=extractor.get_scope()))
        extractor.results = ['test_result']
        result = extractor.extract()
        self.assertEqual(result, 'test_result')
        # Ensure second result is None
        result = extractor.extract()
        self.assertIsNone(result)