code: def test_register(self):
      self.assertEqual(self.text.get("1.0", "end"), "\n")
      self.assertEqual(self.func.args, ("insert", "asdf"))
      self.assertIn("insert", self.redir._operations)
      self.assertIn("insert", self.text.__dict__)
      self.assertEqual(self.text.insert, self.func)
  
imports: from idlelib.redirector import WidgetRedirector
  import unittest
  from test.support import requires
  from tkinter import Tk, Text, TclError
  from idlelib.idle_test.mock_idle import Func
label_desc: Use image node_id 6 for calling the WidgetRedirectorTest obj's underlying member method code with example usage: obj.test_register() without return types