code: def test_using_config_local_did_not_exist(self):
      with chainer.using_config("x", "temporary x", self.config):
          self.assertEqual(self.config.x, "temporary x")
          self.assertEqual(self.global_config.x, "global x")
      self.assertEqual(self.config.x, "global x")
      self.global_config.x = "global x2"
      self.assertEqual(self.config.x, "global x2")
  
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 4 for calling the TestLocalConfig obj's underlying member method code with example usage: obj.test_using_config_local_did_not_exist() without return types