old_contents: import unittest
  
  import mock
  
  from chainer import testing
  from chainer.training import extensions
  
  
  @testing.parameterize(
      {'trigger': ('epoch', 2)},
      {'trigger': ('iteration', 10)},
  )
  class TestSnapshotObject(unittest.TestCase):
  
      def test_trigger(self):
          target = mock.MagicMock()
          snapshot_object = extensions.snapshot_object(target, 'myfile.dat',
                                                       trigger=self.trigger)
          self.assertEqual(snapshot_object.trigger, self.trigger)
  
  
  @testing.parameterize(
      {'trigger': ('epoch', 2)},
      {'trigger': ('iteration', 10)},
  )
  class TestSnapshot(unittest.TestCase):
  
      def test_trigger(self):
          snapshot = extensions.snapshot(trigger=self.trigger)
          self.assertEqual(snapshot.trigger, self.trigger)
  
  
  testing.run_module(__name__, __file__)
  
new_contents: import unittest
  
  import mock
  
  from chainer import testing
  from chainer.training import extensions
  from chainer.training import trigger
  
  
  @testing.parameterize(
      {'trigger': ('epoch', 2)},
      {'trigger': ('iteration', 10)},
      {'trigger': trigger.IntervalTrigger(5, 'epoch')},
      {'trigger': trigger.IntervalTrigger(20, 'iteration')},
  )
  class TestSnapshotObject(unittest.TestCase):
  
      def test_trigger(self):
          target = mock.MagicMock()
          snapshot_object = extensions.snapshot_object(target, 'myfile.dat',
                                                       trigger=self.trigger)
          self.assertEqual(snapshot_object.trigger, self.trigger)
  
  
  @testing.parameterize(
      {'trigger': ('epoch', 2)},
      {'trigger': ('iteration', 10)},
      {'trigger': trigger.IntervalTrigger(5, 'epoch')},
      {'trigger': trigger.IntervalTrigger(20, 'iteration')},
  )
  class TestSnapshot(unittest.TestCase):
  
      def test_trigger(self):
          snapshot = extensions.snapshot(trigger=self.trigger)
          self.assertEqual(snapshot.trigger, self.trigger)
  
  
  testing.run_module(__name__, __file__)
  
subject: Add unit test to pass Trigger instance.