code: def test_read_simple_file(
      script=""";; ---
  ;; title: Simple file
  ;; ---
  
  ;; Here we have some text
  ;; And below we have some code
  
  (define a 35)
  """,
  ):
      for file_extension in ("ss", "scm"):
          nb = jupytext.reads(script, file_extension)
          assert len(nb.cells) == 3
          assert nb.cells[0].cell_type == "raw"
          assert nb.cells[0].source == "---\ntitle: Simple file\n---"
          assert nb.cells[1].cell_type == "markdown"
          assert (
              nb.cells[1].source == "Here we have some text\n"
              "And below we have some code"
          )
          assert nb.cells[2].cell_type == "code"
          compare(nb.cells[2].source, "(define a 35)")
  
          script2 = jupytext.writes(nb, file_extension)
          compare(script2, script)
  
label_desc: Use image node_id 1 for calling a global function with example usage: test_read_simple_file(script) without return types