code: def test_jupytext_cli_bare(tmpdir):
      tmp_py = str(tmpdir.join("test.py"))
      tmp_ipynb = str(tmpdir.join("test.ipynb"))
      write(new_notebook(cells=[new_code_cell("1 + 1")]), tmp_ipynb)
      with pytest.warns(DeprecationWarning, match="nomarker"):
          jupytext_cli([tmp_ipynb, "--to", "py:bare"])
      assert os.path.isfile(tmp_py)
  
file_path: jupytext/tests/functional/simple_notebooks/test_read_simple_nomarker.py
imports: import os
  import pytest
  from nbformat.v4.nbbase import new_code_cell, new_markdown_cell, new_notebook
  from jupytext import reads, write, writes
  from jupytext.cli import jupytext
  from jupytext.combine import combine_inputs_with_outputs
  from jupytext.compare import compare
label_desc: Use image node_id 2 for calling a global function with example usage: test_jupytext_cli_bare(tmpdir) without return types