code: def test_using_config_local_existed(self):
      with chainer.using_config("y", "temporary y", self.config):
          self.assertEqual(self.config.y, "temporary y")
          self.assertEqual(self.global_config.y, "global y")
      self.assertEqual(self.config.y, "local y")
  
file_path: chainer/tests/chainer_tests/test_configuration.py
imports: import io
  import threading
  import unittest
  import chainer
  from chainer import configuration
  from chainer import testing
label_desc: Use image node_id 5 for calling the TestLocalConfig obj's underlying member method code with example usage: obj.test_using_config_local_existed() without return types