def test_level_one(self):
     self.assertEqual([2, 1, 0, 6, 101, 38, 21, 19, 13, 1],
                     int_to_int([1, 0, -1, 5, 100, 37, 20, 18, 12, 0]))
 def test_level_one_again(self):
     self.assertEqual([2, 3, 4], int_to_int([1, 2, 3]))