code: def setUp(self):
      # Make sure that the test key is absent when the test
      # starts.
      self.delete_tree(HKEY_CURRENT_USER, test_key_name)
  
imports: import gc
  import os, sys, errno
  import threading
  import unittest
  from platform import machine, win32_edition
  from test.support import cpython_only, import_helper
  from winreg import *
label_desc: Use image node_id 1 for calling the BaseWinregTests obj's underlying member method code with example usage: obj.setUp() without return types