code: def test_file_with_blank_lines(blank_lines):
      py_script = """# Markdown cell{0}
  # Another one{0}
  """.format(
          "\n".join([""] * blank_lines)
      )
  
      notebook = jupytext.reads(py_script, "py")
      py_script2 = jupytext.writes(notebook, "py")
      compare(py_script2, py_script)
  
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 1 for calling a global function with example usage: test_file_with_blank_lines(blank_lines) without return types