code: def test_uncomment_region_event(self):
      comment = self.formatter.comment_region_event
      uncomment = self.formatter.uncomment_region_event
      text = self.text
      eq = self.assertEqual
  
      text.tag_add("sel", "7.0", "10.0")
      comment()
      uncomment()
      eq(
          text.get("7.0", "10.0"),
          ("\n    def compare(self):\n        if a > b:\n"),
      )
  
      # Only remove comments at the beginning of a line.
      text.tag_remove("sel", "1.0", "end")
      text.tag_add("sel", "3.0", "4.0")
      uncomment()
      eq(text.get("3.0", "3.end"), ("    # Class comment."))
  
      self.formatter.set_region(
          "3.0", "4.0", "", ["# Class comment.", ""]
      )
      uncomment()
      eq(text.get("3.0", "3.end"), (" Class comment."))
  
imports: from idlelib import format
  import unittest
  from unittest import mock
  from test.support import requires
  from tkinter import Tk, Text
  from idlelib.editor import EditorWindow
  from idlelib.idle_test.mock_idle import Editor
label_desc: Use image node_id 10 for calling the FormatRegionTest obj's underlying member method code with example usage: obj.test_uncomment_region_event() without return types