code: def test_split_on_header_after_two_blank_lines(
      markdown="""A paragraph
  
  
  # H1 Header
  """,
  ):
      fmt = {"extension": ".Rmd", "split_at_heading": True}
      nb = jupytext.reads(markdown, fmt)
      markdown2 = jupytext.writes(nb, fmt)
      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 7 for calling a global function with example usage: test_split_on_header_after_two_blank_lines(markdown) without return types