def test_contains(self):
        prio_set_list = event._PrioritizedSetList()
        obj = object()

        prio_set_list.add(0, obj)
        assert obj in prio_set_list
def test_impl(n):
            df = pd.DataFrame({'A': ['aa', 'bb', 'aa', 'cc', 'cc']})
            return df.A.nunique()