code: def test_modellibrary_no_models(monkeypatch):
      monkeypatch.setenv("modelkit_MODELS", "")
      p = ModelLibrary(models=None)
      assert p.configuration == {}
      assert p.required_models == {}
  
      with pytest.raises(errors.ModelsNotFound):
          # model does not exist
          p.get("some_model")
  
imports: import asyncio
  import os
  import pytest
  from modelkit.assets.errors import AssetDoesNotExistError, InvalidAssetSpecError
  from modelkit.core import errors
  from modelkit.core.library import ConfigurationNotFoundException, ModelLibrary, download_assets, load_model
  from modelkit.core.model import Asset, AsyncModel, Model
  from modelkit.core.model_configuration import ModelConfiguration, _configurations_from_objects, configure, list_assets
  from modelkit.core.settings import LibrarySettings
  from tests import TEST_DIR, testmodels
  from tests.assets.test_versioning import test_versioning
label_desc: Use image node_id 7 for calling a global function with example usage: test_modellibrary_no_models(monkeypatch) without return types