code: def tearDownClass(cls):
      cls.pb.close()
      cls.root.update_idletasks()
      cls.root.destroy()
      del cls.root, cls.pb
  
imports: from idlelib import pathbrowser
  import unittest
  from test.support import requires
  from tkinter import Tk
  import os.path
  import pyclbr
  import sys
  from idlelib.idle_test.mock_idle import Func
  import idlelib
  from idlelib import browser
  from idlelib.tree import TreeNode
label_desc: Use image node_id 2 for calling the PathBrowserTest obj's underlying member method code with example usage: obj.tearDownClass(cls) without return types