code: def test_detect_file_type_incompatible(self, file):
      # tests detect file type for no extension, unknown compression and unknown partial extension
      with pytest.raises(RuntimeError):
          utils._detect_file_type(file)
  
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 8 for calling the TestDatasetsUtils obj's underlying member method code with example usage: obj.test_detect_file_type_incompatible(file) without return types