code: def test_sub_dataset_overrun(self):
      original = [1, 2, 3, 4, 5]
      subset = datasets.SubDataset(original, 1, 4)
      with self.assertRaises(IndexError):
          subset[len(subset)]
  
imports: import unittest
  from chainer import datasets
  from chainer import testing
label_desc: Use image node_id 2 for calling the TestSubDataset obj's underlying member method code with example usage: obj.test_sub_dataset_overrun() without return types