code: def test_incomplete_header(
      rmd="""---
  title: Incomplete header
  
  ```{python}
  1+1
  ```
  """,
  ):
      nb = jupytext.reads(rmd, "Rmd")
      assert len(nb.cells) == 2
      assert nb.cells[0].cell_type == "markdown"
      assert nb.cells[0].source == "---\ntitle: Incomplete header"
      assert nb.cells[1].cell_type == "code"
      assert nb.cells[1].source == "1+1"
  
label_desc: Use image node_id 1 for calling a global function with example usage: test_incomplete_header(rmd) without return types