class_docstr: A TestResult that makes callbacks to its associated GUI TestRunner.
  Used by BaseGUITestRunner. Need not be created directly.
class_docstr_tok: ["A","TestResult","that","makes","callbacks","to","its","associated","GUI","TestRunner",".","Used","by","BaseGUITestRunner",".","Need","not","be","created","directly","."]
code: def addFailure(self, test, err):
      unittest.TestResult.addFailure(self, test, err)
      self.callback.notifyTestFailed(test, err)
  
imports: import sys
  import traceback
  import unittest
  import tkinter
  from tkinter import messagebox
  from tkinter import filedialog
  from tkinter import simpledialog
label_desc: Use image node_id 3 for calling the GUITestResult obj's underlying member method code with example usage: obj.addFailure(test, err) without return types