code: def test_mutiple_cells_differ():
      nb1 = new_notebook(cells=[new_code_cell(""), new_code_cell("2")])
      nb2 = new_notebook(
          cells=[new_code_cell("1+1"), new_code_cell("2\n2")]
      )
      with pytest.raises(NotebookDifference) as exception_info:
          compare_notebooks(nb2, nb1, raise_on_first_difference=False)
      assert "Cells 1,2 differ" in exception_info.value.args[0]
  
imports: import pytest
  from nbformat.v4.nbbase import new_code_cell, new_markdown_cell, new_notebook, new_raw_cell
  from jupytext.compare import NotebookDifference, compare, compare_cells, compare_notebooks
  from jupytext.compare import test_round_trip_conversion
label_desc: Use image node_id 17 for calling a global function with example usage: test_mutiple_cells_differ() without return types