code: def test_headers_and_trailer(self) -> None:
      grammar_source = """
          @header 'SOME HEADER'
          @subheader 'SOME SUBHEADER'
          @trailer 'SOME TRAILER'
          start: expr+ NEWLINE? ENDMARKER
          expr: x=NAME
          """
      grammar = parse_string(grammar_source, GrammarParser)
      parser_source = generate_c_parser_source(grammar)
  
      self.assertTrue("SOME HEADER" in parser_source)
      self.assertTrue("SOME SUBHEADER" in parser_source)
      self.assertTrue("SOME TRAILER" in parser_source)
  
imports: import contextlib
  import subprocess
  import sysconfig
  import textwrap
  import unittest
  import os
  import shutil
  import tempfile
  from pathlib import Path
  from test import test_tools
  from test import support
  from test.support import os_helper, import_helper
  from test.support.script_helper import assert_python_ok
label_desc: Use image node_id 23 for calling the TestCParser obj's underlying member method code with example usage: obj.test_headers_and_trailer() without return types