code: def test_pool_close(self):
      pool = Pool(2)
      res = pool.map(f, [1, 2, 3])
      assert res == [1, 4, 9]
      pool.close()
  
      with pytest.raises(ValueError):
          pool.map(f, [1, 2, 3])
  
      pool.join()
  
imports: import os
  import time
  from fiber import Pool, SimpleQueue
  import fiber
  import pytest
  import docker
  import threading
  import random
  import fiber.config
label_desc: Use image node_id 10 for calling the TestPool obj's underlying member method code with example usage: obj.test_pool_close() without return types