code: def invalid_md_file():
      return Path(__file__).parent / "invalid_file_896.md"
  
file_path: jupytext/tests/functional/others/test_invalid_file.py
imports: from pathlib import Path
  import pytest
  from tornado.web import HTTPError
  from jupytext import TextFileContentsManager, read
  from jupytext.cli import jupytext
label_desc: Use image node_id 1 for calling a global function with example usage: invalid_md_file() and returns: unknown