code: def test_two_markdown_cells(
      markdown="""# A header
  
  <!-- #region -->
  A long
  
  
  markdown cell
  <!-- #endregion -->
  """,
  ):
      nb = jupytext.reads(markdown, "md")
      compare_cells(
          nb.cells,
          [
              new_markdown_cell(source="# A header"),
              new_markdown_cell(source="A long\n\n\nmarkdown cell"),
          ],
          compare_ids=False,
      )
      markdown2 = jupytext.writes(nb, "md")
      compare(markdown2, markdown)
  
imports: from nbformat.v4.nbbase import new_code_cell, new_markdown_cell, new_notebook, new_raw_cell
  import jupytext
  from jupytext.combine import combine_inputs_with_outputs
  from jupytext.compare import compare, compare_cells, compare_notebooks
label_desc: Use image node_id 16 for calling a global function with example usage: test_two_markdown_cells(markdown) without return types