code: def test_restore_from_invalid_dir(tmpdir):
      """Should raise an error if the restore directory doesn't exist or is invalid."""
      with pytest.raises(ValueError):
          BaseTrainer.restore(str(tmpdir))
  
      with pytest.raises(ValueError):
          BaseTrainer.restore("mock:///not/found")
  
imports: import warnings
  from pathlib import Path
  from typing import Dict, List
  import pytest
  import ray
  from ray import train
  from ray.air._internal.uri_utils import URI
  from ray.train import CheckpointConfig, RunConfig, ScalingConfig
  from ray.train.base_trainer import BaseTrainer
  from ray.train.data_parallel_trainer import DataParallelTrainer
  from ray.train.lightgbm import LightGBMTrainer
  from ray.train.tests.util import create_dict_checkpoint, load_dict_checkpoint
  from ray.train.torch import TorchTrainer
  from ray.train.trainer import TrainingFailedError
  from ray.train.xgboost import XGBoostTrainer
  from ray.tune import Callback
  from ray.tune.experiment import Trial
label_desc: Use image node_id 9 for calling a global function with example usage: test_restore_from_invalid_dir(tmpdir) without return types