code: def test_sequence(self):
      test_dataset = ZipDataset(
          datasets=[Dataset_(5), Dataset_(5), Dataset_(5)],
          transform=None,
      )
      subset = test_dataset[[1, 3, 4]]
      self.assertEqual(subset[-1], (4, 4, 4))
      self.assertEqual(len(subset), 3)
  
file_path: MONAI/tests/test_zipdataset.py
imports: from __future__ import annotations
  import unittest
  import torch
  from parameterized import parameterized
  from monai.data import ZipDataset
label_desc: Use image node_id 3 for calling the TestZipDataset obj's underlying member method code with example usage: obj.test_sequence() without return types