code: def test_digital_signature_invalidate(digitally_signed, no_outpdf):
      check_ocrmypdf(
          digitally_signed,
          no_outpdf,
          "--force-ocr",
          "--invalidate-digital-signatures",
      )
  
file_path: OCRmyPDF/tests/test_acroform.py
imports: from __future__ import annotations
  import logging
  import pikepdf
  import pytest
  import ocrmypdf
  from .conftest import check_ocrmypdf
label_desc: Use image node_id 6 for calling a global function with example usage: test_digital_signature_invalidate(digitally_signed, no_outpdf) without return types