code: def test_notebook_with_empty_cells(blank_cells):
      notebook = new_notebook(
          cells=[new_markdown_cell("markdown cell one")]
          + [new_code_cell("") for i in range(blank_cells)]
          + [new_markdown_cell("markdown cell two")]
          + [new_code_cell("") for i in range(blank_cells)],
          metadata={"jupytext": {"main_language": "python"}},
      )
  
      script = jupytext.writes(notebook, "py")
      notebook2 = jupytext.reads(script, "py")
  
      compare_notebooks(notebook2, notebook)
  
imports: import pytest
  from nbformat.v4.nbbase import new_code_cell, new_markdown_cell, new_notebook
  import jupytext
  from jupytext.compare import compare, compare_notebooks
label_desc: Use image node_id 2 for calling a global function with example usage: test_notebook_with_empty_cells(blank_cells) without return types