code: def tearDown(self):
      self.color.close()
      self.percolator.removefilter(self.color)
      self.text.delete("1.0", "end")
      self.color.resetcache()
      del self.color
  
imports: from idlelib import colorizer
  from test.support import requires
  import unittest
  from unittest import mock
  from idlelib.idle_test.tkinter_testing_utils import run_in_tk_mainloop
  from functools import partial
  import textwrap
  from tkinter import Tk, Text
  from idlelib import config
  from idlelib.percolator import Percolator
label_desc: Use image node_id 4 for calling the ColorDelegatorTest obj's underlying member method code with example usage: obj.tearDown() without return types