code: def test_long_rule_str(self) -> None:
      grammar_source = """
          start: zero | one | one zero | one one | one zero zero | one zero one | one one zero | one one one
          """
      expected = """
          start:
              | zero
              | one
              | one zero
              | one one
              | one zero zero
              | one zero one
              | one one zero
              | one one one
          """
      grammar: Grammar = parse_string(grammar_source, GrammarParser)
      self.assertEqual(
          str(grammar.rules["start"]), textwrap.dedent(expected).strip()
      )
  
imports: import ast
  import difflib
  import io
  import textwrap
  import unittest
  from test import test_tools
  from typing import Dict, Any
  from tokenize import TokenInfo, NAME, NEWLINE, NUMBER, OP
label_desc: Use image node_id 3 for calling the TestPegen obj's underlying member method code with example usage: obj.test_long_rule_str() without return types