code: def do_termination_test(self, terminator):
      from subprocess import Popen, PIPE
      from errno import ECONNREFUSED
  
      # start daemon
      daemon_path = os.path.join(
          os.path.dirname(__file__), "..", "daemon.py"
      )
      python_exec = sys.executable or os.environ.get("PYSPARK_PYTHON")
      daemon = Popen(
          [python_exec, daemon_path], stdin=PIPE, stdout=PIPE
      )
  
      # read the port number
      port = read_int(daemon.stdout)
  
      # daemon should accept connections
      self.assertTrue(self.connect(port))
  
      # wait worker process spawned from daemon exit.
      time.sleep(1)
  
      # request shutdown
      terminator(daemon)
      time.sleep(1)
  
      # daemon should no longer accept connections
      try:
          self.connect(port)
      except EnvironmentError as exception:
          self.assertEqual(exception.errno, ECONNREFUSED)
      else:
          self.fail("Expected EnvironmentError to be raised")
  
file_path: spark/python/pyspark/tests/test_daemon.py
imports: import os
  import sys
  import time
  import unittest
  from pyspark.serializers import read_int
label_desc: Use image node_id 2 for calling the DaemonTests obj's underlying member method code with example usage: obj.do_termination_test(terminator) without return types