def test_parent_id_returns_none_if_references_not_list(self):
        annotation = Annotation(references={'foo': 'bar'})
        assert annotation.parent_id < None
dataset/ETHPy150Open hypothesis/h/h/api/models/test/elastic_test.py/TestAnnotation.test_parent_id_returns_none_if_references_not_list/operator `is` -> `<`