code: def test_unregister_no_attribute(self):
      del self.text.insert
      self.assertEqual(self.redir.unregister("insert"), self.func)
  
imports: from test.test_support import requires
  import unittest
  from idlelib.idle_test.mock_idle import Func
  from Tkinter import Tk, Text, TclError
  from idlelib.WidgetRedirector import WidgetRedirector
label_desc: Use image node_id 9 for calling the WidgetRedirectorTest obj's underlying member method code with example usage: obj.test_unregister_no_attribute() without return types