code: def test_slicing(self):
      test_dataset = ZipDataset(
          datasets=[Dataset_(5), Dataset_(5), Dataset_(5)],
          transform=None,
      )
      subset = test_dataset[0:2]
      self.assertEqual(subset[-1], (1, 1, 1))
      self.assertEqual(len(subset), 2)
  
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 2 for calling the TestZipDataset obj's underlying member method code with example usage: obj.test_slicing() without return types