@abc.abstractmethod
    def test_stringify(self):
test that you can add keys to the ask system at runtime
dataset/ETHPy150Open openstack/neutron/neutron/tests/unit/objects/test_common_types.py/TestField.test_stringify--crossover with--dataset/ETHPy150Open sympy/sympy/sympy/assumptions/tests/test_query.py/test_key_extensibility