code: def test_init(self):
      eq = self.assertEqual
      eq(self.cbt_C1.name, "C1()")
      self.assertFalse(self.cbt_C1.isfunction)
      eq(self.cbt_f1.name, "f1")
      self.assertTrue(self.cbt_f1.isfunction)
  
imports: from idlelib import browser
  from test.support import requires
  import unittest
  from unittest import mock
  from idlelib.idle_test.mock_idle import Func
  from idlelib.util import py_extensions
  from collections import deque
  import os.path
  import pyclbr
  from tkinter import Tk
  from idlelib.tree import TreeNode
label_desc: Use image node_id 3 for calling the ChildBrowserTreeItemTest obj's underlying member method code with example usage: obj.test_init() without return types