code: def test_start_timeout(self):
      fiber.backend.get_backend(name="docker")
      old_backend = fiber.backend._backends["docker"]
      fiber.backend._backends["docker"] = TimeoutBackend(n=4)
  
      p = fiber.Pool(4)
      res = p.map(square_worker, [1, 2, 3, 4])
      p.terminate()
      fiber.backend._backends["docker"] = old_backend
  
      assert res == [i**2 for i in range(1, 5)]
  
imports: import pytest
  import time
  import math
  import select
  import fiber
  import docker
  import requests
  from fiber import Process
  from fiber.docker_backend import Backend
  import fiber.config
label_desc: Use image node_id 17 for calling the TestBasic obj's underlying member method code with example usage: obj.test_start_timeout() without return types