code: def test_after_idle(self):
      root = self.root
  
      def callback(start=0, step=1):
          nonlocal count
          count = start + step
  
      # Set up with callback with no args.
      count = 0
      idle1 = root.after_idle(callback)
      self.assertIn(idle1, root.tk.call("after", "info"))
      (script, _) = root.tk.splitlist(
          root.tk.call("after", "info", idle1)
      )
      root.update_idletasks()  # Process all pending events.
      self.assertEqual(count, 1)
      with self.assertRaises(tkinter.TclError):
          root.tk.call(script)
  
      # Set up with callback with args.
      count = 0
      idle1 = root.after_idle(callback, 42, 11)
      root.update_idletasks()  # Process all pending events.
      self.assertEqual(count, 53)
  
      # Cancel before called.
      idle1 = root.after_idle(callback)
      self.assertIn(idle1, root.tk.call("after", "info"))
      (script, _) = root.tk.splitlist(
          root.tk.call("after", "info", idle1)
      )
      root.after_cancel(idle1)  # Cancel this event.
      self.assertEqual(count, 53)
      with self.assertRaises(tkinter.TclError):
          root.tk.call(script)
  
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 8 for calling the MiscTest obj's underlying member method code with example usage: obj.test_after_idle() without return types