code: def test_get(self):
      self._get_check(self.dataset)
  
imports: import os
  import pickle
  import unittest
  import numpy
  from chainer import datasets
  from chainer.datasets import image_dataset
  from chainer import testing
label_desc: Use image node_id 4 for calling the TestMultiZippedImageDataset obj's underlying member method code with example usage: obj.test_get() without return types