def poll(self, timeout=None):
        raise NotImplementedError()
Test if no unnecessary action is performed if added and deleted.
dataset/ETHPy150Open fengsp/rc/rc/poller.py/BasePoller.poll--crossover with--dataset/ETHPy150Open zlorf/django-synchro/synchro/tests.py/SimpleSynchroTests.test_add_del