code: def test_cell_markers_in_config(tmpdir, python_notebook):
      (tmpdir / "jupytext.toml").write('''cell_markers = '"""'\n''')
  
      cm = jupytext.TextFileContentsManager()
      cm.root_dir = str(tmpdir)
      nb = python_notebook
      nb.metadata["jupytext"] = {"formats": "ipynb,py:percent"}
  
      cm.save(model=notebook_model(nb), path="notebook.ipynb")
  
      text = (tmpdir / "notebook.py").read()
      assert (
          '''# %% [markdown]
  """
  A short notebook
  """
  '''
          in text
      )
  
      nb2 = jupytext.read(tmpdir / "notebook.py")
      compare_notebooks(nb, nb2)
  
imports: import os
  import pytest
  from nbformat.v4.nbbase import new_code_cell, new_markdown_cell, new_notebook, new_raw_cell
  import jupytext
  from jupytext.compare import compare, compare_notebooks, notebook_model
label_desc: Use image node_id 17 for calling a global function with example usage: test_cell_markers_in_config(tmpdir, python_notebook) without return types