code: def test_read_stdout_after_process_exit(self):
      async def execute():
          code = "\n".join(
              [
                  "import sys",
                  "for _ in range(64):",
                  '    sys.stdout.write("x" * 4096)',
                  "sys.stdout.flush()",
                  "sys.exit(1)",
              ]
          )
  
          process = await asyncio.create_subprocess_exec(
              sys.executable,
              "-c",
              code,
              stdout=asyncio.subprocess.PIPE,
          )
  
          while True:
              data = await process.stdout.read(65536)
              if data:
                  await asyncio.sleep(0.3)
              else:
                  break
  
      self.loop.run_until_complete(execute())
  
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 26 for calling the SubprocessMixin obj's underlying member method code with example usage: obj.test_read_stdout_after_process_exit() without return types