code: def tearDown(self):
      try:
          os.close(self.read_fd)
      except OSError:
          pass
  
      try:
          os.close(self.write_fd)
      except OSError:
          pass
  
imports: import os
  import unittest
  import random
  from test import support
  from test.support import threading_helper
  import _thread
  import time
  import warnings
  import weakref
  from test import lock_tests
label_desc: Use image node_id 3 for calling the TestForkInThread obj's underlying member method code with example usage: obj.tearDown() without return types