code: def test_multi_processes(self):
      n = 3
      procs = []
      for i in range(n):
          procs.append(
              Process(
                  target=func_add,
                  args=(42, 89),
                  name="test_multi_processes",
              )
          )
      for p in procs:
          p.start()
      for p in procs:
          p.join()
      for p in procs:
          assert 0 == p.exitcode
  
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 5 for calling the TestBasic obj's underlying member method code with example usage: obj.test_multi_processes() without return types