code: def test_check_integrity(self):
      existing_fpath = TEST_FILE
      nonexisting_fpath = ""
      correct_md5 = "9c0bb82894bb3af7f7675ef2b3b6dcdc"
      false_md5 = ""
      assert utils.check_integrity(existing_fpath, correct_md5)
      assert not utils.check_integrity(existing_fpath, false_md5)
      assert utils.check_integrity(existing_fpath)
      assert not utils.check_integrity(nonexisting_fpath)
  
imports: import contextlib
  import gzip
  import os
  import pathlib
  import re
  import tarfile
  import zipfile
  import pytest
  import torch
  import torchvision.datasets.utils
  from common_utils import assert_equal
  from torch._utils_internal import get_file_path_2
  from torchvision.datasets.folder import make_dataset
  from torchvision.datasets.utils import _COMPRESSED_FILE_OPENERS
label_desc: Use image node_id 4 for calling the TestDatasetsUtils obj's underlying member method code with example usage: obj.test_check_integrity() without return types