Write a function to convert a list of multiple integers into a single integer.
def multiple_to_single(L):
  x = int("".join(map(str, L)))
  return x
<s>[INST]<<SYS>>Given a task and its code, generate test cases for the code.<</SYS>>Write a function to convert a list of multiple integers into a single integer.
def multiple_to_single(L):
  x = int("".join(map(str, L)))
  return x[/INST]assert multiple_to_single([11, 33, 50])==113350
assert multiple_to_single([-1,2,3,4,5,6])==-123456
assert multiple_to_single([10,15,20,25])==10152025</s>