code: def test_decompress_file_unknown():
      with pytest.raises(NotImplementedError):
          check_decompress_file("unknown")
  
imports: import itertools
  import os
  from unittest.mock import patch
  import pytest
  from datalad import cfg
  from datalad.support import path
  from datalad.support.archive_utils_patool import unixify_path
  from datalad.support.archives import ArchivesCache, ExtractedArchive, compress_files, decompress_file
  from datalad.support.exceptions import MissingExternalDependency
  from datalad.support.external_versions import external_versions
  from datalad.tests.utils_pytest import OBSCURE_FILENAME, SkipTest, assert_false, assert_raises, assert_true, eq_, ok_file_has_content, ok_generator, on_nfs, on_travis, on_windows, skip_if, swallow_outputs, with_tempfile, with_tree
  import mimetypes
label_desc: Use image node_id 3 for calling a global function with example usage: test_decompress_file_unknown() without return types