def setUp(self):
        self.zero = self._getDelayedCallAt(0)
        self.one = self._getDelayedCallAt(1)
Returns backend_data, minus any keys not generated by
dataset/ETHPy150Open nlloyd/SubliminalCollaborator/libs/twisted/internet/test/test_base.py/DelayedCallTests.setUp--crossover with--dataset/ETHPy150Open mozilla/moztrap/tests/case/api/crud.py/ApiCrudCases.clean_backend_data