code: def test_combine_lower_version_raises(tmpdir):
      tmp_ipynb = "notebook.ipynb"
      tmp_nbpy = "notebook.py"
  
      with open(str(tmpdir.join(tmp_nbpy)), "w") as fp:
          fp.write(
              """# ---
  # jupyter:
  #   jupytext_formats: ipynb,py
  #   jupytext_format_version: '0.0'
  # ---
  
  # New cell
  """
          )
  
      nb = new_notebook(metadata={"jupytext_formats": "ipynb,py"})
      jupytext.write(nb, str(tmpdir.join(tmp_ipynb)))
  
      cm = jupytext.TextFileContentsManager()
      cm.formats = "ipynb,py"
      cm.root_dir = str(tmpdir)
  
      with pytest.raises(HTTPError):
          cm.get(tmp_ipynb)
  
imports: import pytest
  from nbformat.v4.nbbase import new_notebook
  from tornado.web import HTTPError
  import jupytext
label_desc: Use image node_id 2 for calling a global function with example usage: test_combine_lower_version_raises(tmpdir) without return types