def contain_item(self, key, item):
        _dict_set = self._get_dict_set()
        if key not in _dict_set:
            return False
        return item in _dict_set[key]
Test that registering a user sends the ``user_registered``
dataset/ETHPy150Open pinterest/kingpin/kingpin/manageddata/managed_datastructures.py/ManagedMappedList.contain_item--crossover with--dataset/ETHPy150Open nathanborror/django-registration/registration/tests/backends.py/DefaultRegistrationBackendTests.test_registration_signal