code: def test_default_values_blank_cells_true():
      """
      Test output for default values if include_blank_cells.
      """
      assert (
          None
          in io.xlsx_cells(filename, "pivot-notes")["value"].tolist()
      )
  
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 12 for calling a global function with example usage: test_default_values_blank_cells_true() without return types