code: def test_long_multiline_string(self):
      source = textwrap.dedent(
          '''\
              """a
              b
              c
              d
              e"""
              '''
      )
      self._assert_highlighting(source, {"STRING": [("1.0", "5.4")]})
  
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 18 for calling the ColorDelegatorTest obj's underlying member method code with example usage: obj.test_long_multiline_string() without return types