code: def test_add_two_extensions_default_priority(self):
      self.called_order = []
  
      @training.make_extension(trigger=(1, "epoch"))
      def dummy_extension_1(trainer):
          self.called_order.append(1)
  
      @training.make_extension(trigger=(1, "epoch"))
      def dummy_extension_2(trainer):
          self.called_order.append(2)
  
      self.trainer.extend(dummy_extension_1)
      self.trainer.extend(dummy_extension_2)
      self.trainer.run()
      self.assertEqual(self.called_order, [1, 2])
  
imports: import time
  import traceback
  import unittest
  from chainer import testing
  from chainer import training
label_desc: Use image node_id 12 for calling the TestTrainer obj's underlying member method code with example usage: obj.test_add_two_extensions_default_priority() without return types