def create_group(self, group):
        raise NotImplementedError
Test to ensure on_invalid handler can be changed on the fly
dataset/ETHPy150Open mathcamp/pypicloud/pypicloud/access/base.py/IMutableAccessBackend.create_group--crossover with--dataset/ETHPy150Open timothycrosley/hug/tests/test_routing.py/TestInternalValidation.test_on_invalid