code: def test_paragraph_is_fully_commented(lines):
      assert paragraph_is_fully_commented(
          lines.splitlines(), comment="#", main_language="python"
      )
  
file_path: jupytext/tests/functional/others/test_cells.py
imports: import pytest
  from nbformat.v4.nbbase import new_markdown_cell
  from jupytext.cell_reader import LightScriptCellReader, RMarkdownCellReader, paragraph_is_fully_commented, uncomment
  from jupytext.cell_to_text import RMarkdownCellExporter
label_desc: Use image node_id 1 for calling a global function with example usage: test_paragraph_is_fully_commented(lines) without return types