code: def __str__(self):
      return f"NO-OP Page 4 {NoopOcrEngine.version()}"
  
file_path: OCRmyPDF/tests/plugins/tesseract_simulate_oom_killer.py
imports: from __future__ import annotations
  import os
  import signal
  from pathlib import Path
  from ocrmypdf import hookimpl
label_desc: Use image node_id 1 for calling the Page4Engine obj's underlying member method code with example usage: obj.__str__() and returns: str, NoopOcrEngine