code: def test_set_cell_markers_cli(tmpdir, cwd_tmpdir):
      tmpdir.join("test.py").write(
          "# %% [markdown]\n# A Markdown cell\n"
      )
      jupytext(["--format-options", 'cell_markers="""', "test.py"])
      py = tmpdir.join("test.py").read()
      assert py.endswith('# %% [markdown]\n"""\nA Markdown cell\n"""\n')
  
imports: from nbformat.v4.nbbase import new_raw_cell
  from jupytext import reads, writes
  from jupytext.cli import jupytext
label_desc: Use image node_id 1 for calling a global function with example usage: test_set_cell_markers_cli(tmpdir, cwd_tmpdir) without return types