code: def test_ok(self):
      view = VW(root, "Title", "test text", modal=False)
      view.destroy = Func()
      view.ok()
      self.assertTrue(view.destroy.called)
      del view.destroy  # Unmask real function.
      view.destroy()
  
imports: from idlelib import textview
  from test.support import requires
  import os
  import unittest
  from tkinter import Tk, TclError, CHAR, NONE, WORD
  from tkinter.ttk import Button
  from idlelib.idle_test.mock_idle import Func
  from idlelib.idle_test.mock_tk import Mbox_func
label_desc: Use image node_id 4 for calling the ViewWindowTest obj's underlying member method code with example usage: obj.test_ok() without return types