code: def test_notebook_one_blank_line_between_cells(
      script="""# +
  1 + 1
  
  2 + 2
  
  # +
  3 + 3
  
  4 + 4
  
  # +
  5 + 5
  
  
  def g(x):
      return 6
  
  
  # +
  7 + 7
  
  
  def h(x):
      return 8
  
  
  # +
  def i(x):
      return 9
  
  
  10 + 10
  
  
  # +
  def j(x):
      return 11
  
  
  12 + 12
  """,
  ):
      notebook = jupytext.reads(script, "py")
      for cell in notebook.cells:
          lines = cell.source.splitlines()
          assert lines[0]
          assert lines[-1]
          assert not cell.metadata, cell.source
  
      script2 = jupytext.writes(notebook, "py")
  
      compare(script2, script)
  
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 26 for calling a global function with example usage: test_notebook_one_blank_line_between_cells(script) without return types