code: def test_report_error(self):
      showerror = Mbox.showerror
      Equal = self.assertEqual
      pat = "[a-z"
      msg = "unexpected end of regular expression"
  
      Equal(self.engine.report_error(pat, msg), None)
      Equal(showerror.title, "Regular expression error")
      expected_message = "Error: " + msg + "\nPattern: [a-z"
      Equal(showerror.message, expected_message)
  
      Equal(self.engine.report_error(pat, msg, 5), None)
      Equal(showerror.title, "Regular expression error")
      expected_message += "\nOffset: 5"
      Equal(showerror.message, expected_message)
  
imports: import re
  import unittest
  from Tkinter import BooleanVar, StringVar, TclError
  import tkMessageBox
  from idlelib import SearchEngine
  from idlelib.idle_test.mock_tk import Var, Mbox
  from idlelib.idle_test.mock_tk import Text
label_desc: Use image node_id 6 for calling the SearchEngineTest obj's underlying member method code with example usage: obj.test_report_error() without return types