code: def test_check_start_none():
      """
      Raise error if start_point is None,
      and end_point is not None.
      """
      with pytest.raises(
          TypeError, match="start_point should be one.+"
      ):
          io.xlsx_cells(
              filename, "clean", start_point=None, end_point="B5"
          )
  
imports: from pathlib import Path
  import pytest
  from openpyxl import load_workbook
  from pandas.testing import assert_series_equal
  from janitor import io
label_desc: Use image node_id 5 for calling a global function with example usage: test_check_start_none() without return types