code: def test_download_file_from_revision(self, mock: Mock) -> None:
      args = Namespace(
          token="hf_****",
          repo_id="author/dataset",
          filenames=["README.md"],
          repo_type="dataset",
          revision="refs/pr/1",
          include=None,
          exclude=None,
          force_download=False,
          resume_download=False,
          cache_dir=None,
          local_dir=".",
          local_dir_use_symlinks="auto",
          quiet=False,
      )
  
      # Output path is printed to terminal once run is completed
      with capture_output() as output:
          DownloadCommand(args).run()
      self.assertRegex(
          output.getvalue(),
          r"<MagicMock name='hf_hub_download\(\)' id='\d+'>",
      )
  
      mock.assert_called_once_with(
          repo_id="author/dataset",
          repo_type="dataset",
          revision="refs/pr/1",
          filename="README.md",
          cache_dir=None,
          resume_download=False,
          force_download=False,
          token="hf_****",
          local_dir=".",
          local_dir_use_symlinks="auto",
          library_name="huggingface-cli",
      )
  
imports: import os
  import unittest
  import warnings
  from argparse import ArgumentParser, Namespace
  from contextlib import contextmanager
  from pathlib import Path
  from typing import Generator
  from unittest.mock import Mock, patch
  from huggingface_hub.commands.delete_cache import DeleteCacheCommand
  from huggingface_hub.commands.download import DownloadCommand
  from huggingface_hub.commands.scan_cache import ScanCacheCommand
  from huggingface_hub.commands.upload import UploadCommand
  from huggingface_hub.utils import RevisionNotFoundError, SoftTemporaryDirectory, capture_output
  from .testing_utils import DUMMY_MODEL_ID
label_desc: Use image node_id 4 for calling the TestDownloadCommand obj's underlying member method code with example usage: obj.test_download_file_from_revision(mock) without return types