code: def test_module_attributes() -> None:
      import optuna
  
      assert hasattr(optuna.integration, "dask")
      assert hasattr(optuna.integration, "lightgbm")
      assert hasattr(optuna.integration, "xgboost")
      assert hasattr(optuna.integration, "LightGBMPruningCallback")
      assert hasattr(optuna.integration, "XGBoostPruningCallback")
  
      with pytest.raises(AttributeError):
          optuna.integration.unknown_attribute
  
label_desc: Use image node_id 2 for calling a global function with example usage: test_module_attributes() without return types