def METHOD_NAME(self):
    """
    Test exception when mismatch of steps are provided.
    """
    with self.assertRaises(combine_csv.CombineCSV.CombineError) as cerr:
        df_test = combine_csv.CombineCSV(self.__basename,
                "remove_me_54.csv", "large_number", lastn=2, endt=1)
    self.assertEqual(cerr.exception._name, "StepBoundsError")