code: def test_get_host_creds_from_default_store_file_store():
      with mock.patch(
          "mlflow.tracking._tracking_service.utils._get_store",
          return_value=FileStore(),
      ):
          with pytest.raises(
              MlflowException,
              match="Failed to get credentials for DBFS",
          ):
              _get_host_creds_from_default_store()
  
imports: import json
  import os
  from unittest import mock
  from unittest.mock import Mock
  import pytest
  from mlflow.exceptions import MlflowException
  from mlflow.store.artifact.artifact_repository_registry import get_artifact_repository
  from mlflow.store.artifact.dbfs_artifact_repo import DbfsRestArtifactRepository, _get_host_creds_from_default_store
  from mlflow.store.tracking.file_store import FileStore
  from mlflow.store.tracking.rest_store import RestStore
  from mlflow.utils.rest_utils import MlflowHostCreds, http_request
label_desc: Use image node_id 15 for calling a global function with example usage: test_get_host_creds_from_default_store_file_store() without return types