class_docstr: Test default title.
class_docstr_tok: ["Test","default","title","."]
code: def setUpClass(cls):
      requires("gui")
      cls.root = Tk()
      cls.root.withdraw()
      cls.dialog = About(cls.root, _utest=True)
  
imports: from idlelib import help_about
  import unittest
  from test.support import requires, findfile
  from tkinter import Tk, TclError
  from idlelib.idle_test.mock_idle import Func
  from idlelib.idle_test.mock_tk import Mbox_func
  from idlelib import textview
  import os.path
  from platform import python_version
label_desc: Use image node_id 1 for calling the DefaultTitleTest obj's underlying member method code with example usage: obj.setUpClass(cls) without return types