code: def test_clipboard(self):
      root = self.root
      root.clipboard_clear()
      root.clipboard_append("Ùñî")
      self.assertEqual(root.clipboard_get(), "Ùñî")
      root.clipboard_append("çōđě")
      self.assertEqual(root.clipboard_get(), "Ùñîçōđě")
      root.clipboard_clear()
      with self.assertRaises(tkinter.TclError):
          root.clipboard_get()
  
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 10 for calling the MiscTest obj's underlying member method code with example usage: obj.test_clipboard() without return types