code: def test_round_trip_python_with_js_cell():
      notebook = new_notebook(
          cells=[
              new_code_cell(
                  """import notebook.nbextensions
  notebook.nbextensions.install_nbextension('index.js', user=True)"""
              ),
              new_code_cell(
                  """%%javascript
  Jupyter.utils.load_extensions('jupytext')"""
              ),
          ]
      )
      text = jupytext.writes(notebook, "py")
      notebook2 = jupytext.reads(text, "py")
      compare_notebooks(notebook2, notebook)
  
imports: 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
label_desc: Use image node_id 33 for calling a global function with example usage: test_round_trip_python_with_js_cell() without return types