text: import random
  
  
  def test_shift_left():
      n = random.randint(1, 100)
      my_list = [random.randint(1, 100) for _ in range(n)]
      my_list_before = my_list.copy()
      for i in range(n):
          my_list.append(my_list.pop(0))
      assert my_list_before == my_list
  
  
  # def test_key_schedule_core():
  #     pass
  
  # def test_expand_key():
  #     pass
  