code: def test_insert(self, mock_notify):
      text = self.text
      # Initial text.
      text.insert("insert", "foo")
      self.assertEqual(text.get("1.0", "end"), "foo\n")
      mock_notify.assert_called_with("1.0", "1.0+3c")
      # Additional text.
      text.insert("insert", "barbaz")
      self.assertEqual(text.get("1.0", "end"), "foobarbaz\n")
      mock_notify.assert_called_with("1.3", "1.3+6c")
  
imports: from idlelib import colorizer
  from test.support import requires
  import unittest
  from unittest import mock
  from idlelib.idle_test.tkinter_testing_utils import run_in_tk_mainloop
  from functools import partial
  import textwrap
  from tkinter import Tk, Text
  from idlelib import config
  from idlelib.percolator import Percolator
label_desc: Use image node_id 8 for calling the ColorDelegatorTest obj's underlying member method code with example usage: obj.test_insert(mock_notify) without return types