code: def test_resume(self):
      self.trainer.elapsed_time = 1.2
      self.trigger(self.trainer)
      assert self.trigger._next_time == 2.0
  
      f = io.BytesIO()
      chainer.serializers.save_npz(f, self.trigger)
  
      trigger = chainer.training.triggers.TimeTrigger(1)
      chainer.serializers.load_npz(io.BytesIO(f.getvalue()), trigger)
      assert trigger._next_time == 2.0
  
file_path: chainer/tests/chainer_tests/training_tests/triggers_tests/test_time_trigger.py
imports: import io
  import unittest
  import chainer
  from chainer import testing
label_desc: Use image node_id 3 for calling the TestTimeTrigger obj's underlying member method code with example usage: obj.test_resume() without return types