code: def test_preprocessor_deprecated():
      with pytest.raises(DeprecationWarning):
          DummyTrainer(preprocessor=Preprocessor())
  
imports: import pytest
  import ray
  from ray.train import Checkpoint, CheckpointConfig, ScalingConfig
  from ray.air._internal.config import ensure_only_allowed_dataclass_keys_updated
  from ray.data.preprocessor import Preprocessor
  from ray.train.trainer import BaseTrainer
label_desc: Use image node_id 10 for calling a global function with example usage: test_preprocessor_deprecated() without return types