code: def test_theme_download_raises_error_if_theme_does_not_exist(self):
      with pytest.raises(
          ValueError,
          match="The space freddyaboulton/nonexistent does not exist",
      ):
          gr.themes.Base.from_hub(
              "freddyaboulton/nonexistent"
          ).to_dict()
  
imports: import tempfile
  from unittest.mock import patch
  import huggingface_hub
  import pytest
  from huggingface_hub.hf_api import SpaceInfo
  import gradio
  from gradio.themes.utils import ThemeAsset, get_matching_version, get_theme_assets
label_desc: Use image node_id 2 for calling the TestThemeUploadDownload obj's underlying member method code with example usage: obj.test_theme_download_raises_error_if_theme_does_not_exist() without return types