code: def test_help_flag(self):
      rc, out, err = assert_python_ok("-m", "json.tool", "-h")
      self.assertEqual(rc, 0)
      self.assertTrue(out.startswith(b"usage: "))
      self.assertEqual(err, b"")
  
imports: import errno
  import os
  import sys
  import textwrap
  import unittest
  import subprocess
  from test import support
  from test.support import os_helper
  from test.support.script_helper import assert_python_ok
label_desc: Use image node_id 8 for calling the TestTool obj's underlying member method code with example usage: obj.test_help_flag() without return types