code: def test_init(self):
      psfl = pyshell.PyShellFileList(self.root)
      self.assertEqual(psfl.EditorWindow, pyshell.PyShellEditorWindow)
      self.assertIsNone(psfl.pyshell)
  
imports: from idlelib import pyshell
  import unittest
  from test.support import requires
  from tkinter import Tk
label_desc: Use image node_id 3 for calling the PyShellFileListTest obj's underlying member method code with example usage: obj.test_init() without return types