code: def test_exitcode(self):
      p = Process(target=func_add, args=(42, 89), name="test_terminate")
      p.start()
      while True:
          if p.exitcode is not None:
              break
          time.sleep(1)
      assert p.exitcode == 0
  
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 15 for calling the TestBasic obj's underlying member method code with example usage: obj.test_exitcode() without return types