code: def test_ask_tabwidth(self, askinteger):
      ask = self.formatter._asktabwidth
      askinteger.return_value = 10
      self.assertEqual(ask(), 10)
  
imports: from idlelib import format
  import unittest
  from unittest import mock
  from test.support import requires
  from tkinter import Tk, Text
  from idlelib.editor import EditorWindow
  from idlelib.idle_test.mock_idle import Editor
label_desc: Use image node_id 13 for calling the FormatRegionTest obj's underlying member method code with example usage: obj.test_ask_tabwidth(askinteger) without return types