code: def test_report(self):
      self.trainer.extend(self.create_extension())
      self.trainer.run()
      self.assertEqual(len(self.trainer.observation), self.expect)
  
imports: import re
  import time
  import unittest
  import mock
  import six
  import chainer
  from chainer import backend
  from chainer import testing
  from chainer import training
  from chainer.training import extensions
label_desc: Use image node_id 1 for calling the TestParameterStatistics obj's underlying member method code with example usage: obj.test_report() without return types