code: def test_communicate_none_input(self):
      args = PROGRAM_CAT
  
      async def run():
          proc = await asyncio.create_subprocess_exec(
              *args,
              stdin=subprocess.PIPE,
              stdout=subprocess.PIPE,
          )
          stdout, stderr = await proc.communicate()
          return proc.returncode, stdout
  
      task = run()
      task = asyncio.wait_for(task, support.LONG_TIMEOUT)
      exitcode, stdout = self.loop.run_until_complete(task)
      self.assertEqual(exitcode, 0)
      self.assertEqual(stdout, b"")
  
imports: import os
  import signal
  import sys
  import textwrap
  import unittest
  import warnings
  from unittest import mock
  import asyncio
  from asyncio import base_subprocess
  from asyncio import subprocess
  from test.test_asyncio import utils
  from test import support
  from test.support import os_helper
label_desc: Use image node_id 3 for calling the SubprocessMixin obj's underlying member method code with example usage: obj.test_communicate_none_input() and returns: proc,  stdout