code: def tearDownClass(cls):
      cls.root.destroy()
      del cls.root
  
imports: import unittest
  import os
  from test.test_support import requires
  from Tkinter import Tk
  from idlelib import textView
  from idlelib.idle_test.mock_idle import Func
  from idlelib.idle_test.mock_tk import Mbox
label_desc: Use image node_id 2 for calling the textviewClassTest obj's underlying member method code with example usage: obj.tearDownClass(cls) without return types