code: def test_no_default_root(self):
      self.assertIs(tkinter._support_default_root, True)
      self.assertIsNone(tkinter._default_root)
      root = tkinter.Tk()
      self.assertIs(tkinter._default_root, root)
      tkinter.NoDefaultRoot()
      self.assertIs(tkinter._support_default_root, False)
      self.assertFalse(hasattr(tkinter, "_default_root"))
      # repeated call is no-op
      tkinter.NoDefaultRoot()
      self.assertIs(tkinter._support_default_root, False)
      self.assertFalse(hasattr(tkinter, "_default_root"))
      root.destroy()
      self.assertIs(tkinter._support_default_root, False)
      self.assertFalse(hasattr(tkinter, "_default_root"))
      root = tkinter.Tk()
      self.assertIs(tkinter._support_default_root, False)
      self.assertFalse(hasattr(tkinter, "_default_root"))
      root.destroy()
  
imports: import functools
  import unittest
  import tkinter
  from tkinter import TclError
  import enum
  from test import support
  from test.test_tkinter.support import AbstractTkTest, AbstractDefaultRootTest, requires_tk
label_desc: Use image node_id 2 for calling the DefaultRootTest obj's underlying member method code with example usage: obj.test_no_default_root() without return types