code: def test_run(self):
      iteration = [0]
  
      def check(trainer):
          iteration[0] += 1
  
          self.assertEqual(trainer.updater.iteration, iteration[0])
          self.assertEqual(
              trainer.updater.epoch, iteration[0] // self.iter_per_epoch
          )
          self.assertEqual(
              trainer.updater.epoch_detail,
              iteration[0] / self.iter_per_epoch,
          )
          self.assertEqual(
              trainer.updater.is_new_epoch,
              (iteration[0] - 1) // self.iter_per_epoch
              != iteration[0] // self.iter_per_epoch,
          )
          self.assertEqual(
              trainer.updater.previous_epoch_detail,
              (iteration[0] - 1) / self.iter_per_epoch,
          )
  
      self.assertEqual(
          len(self.extensions), len(self.trainer._extensions)
      )
  
      self.trainer.extend(check)
      self.trainer.run()
  
      if self.stop_trigger[1] == "iteration":
          self.assertEqual(iteration[0], self.stop_trigger[0])
      elif self.stop_trigger[1] == "epoch":
          self.assertEqual(
              iteration[0],
              math.ceil(self.stop_trigger[0] * self.iter_per_epoch),
          )
  
file_path: chainer/tests/chainer_tests/testing_tests/test_training.py
imports: from __future__ import division
  import math
  import unittest
  from chainer import testing
label_desc: Use image node_id 2 for calling the TestGetTrainerWithMockUpdater obj's underlying member method code with example usage: obj.test_run() without return types