code: def test_make_extension(self):
      def initialize(trainer):
          pass
  
      @training.make_extension(
          trigger=(2, "epoch"),
          default_name="my_ext",
          priority=50,
          initializer=initialize,
      )
      def my_extension(trainer):
          pass
  
      self.assertEqual(my_extension.trigger, (2, "epoch"))
      self.assertEqual(my_extension.default_name, "my_ext")
      self.assertEqual(my_extension.priority, 50)
      self.assertIs(my_extension.initialize, initialize)
  
file_path: chainer/tests/chainer_tests/training_tests/test_extension.py
imports: import unittest
  import pytest
  from chainer import testing
  from chainer import training
label_desc: Use image node_id 4 for calling the TestExtension obj's underlying member method code with example usage: obj.test_make_extension() without return types