code: def test_getitem(self):
      for i in range(len(self.ds.values)):
          self.assertEqual(self.ds[i], self.ds.values[i])
  
file_path: chainer/tests/chainer_tests/dataset_tests/test_dataset_mixin.py
imports: import unittest
  import numpy
  from chainer import dataset
  from chainer import testing
label_desc: Use image node_id 2 for calling the TestDatasetMixin obj's underlying member method code with example usage: obj.test_getitem() without return types