code: def test_get(self):
      img = self.dataset.get_example(0)
      self.assertEqual(img.dtype, self.dtype)
      self.assertEqual(img.shape, (4, 300, 300))
  
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 3 for calling the TestImageDataset obj's underlying member method code with example usage: obj.test_get() without return types