def test_type(self):
        rset = event.ResultSet()
        with pytest.raises(NotImplementedError):
            rset.extend([])
        with pytest.raises(NotImplementedError):
            rset.extend(False)
def test_impl(n):
            df = pd.DataFrame({'A': np.arange(0, n, 1, np.float64)})
            return df.A.describe()