code: def test_import() -> None:
      from optuna.integration import dask  # NOQA
      from optuna.integration import DaskStorage  # NOQA
      from optuna.integration import lightgbm  # NOQA
      from optuna.integration import LightGBMPruningCallback  # NOQA
      from optuna.integration import xgboost  # NOQA
      from optuna.integration import XGBoostPruningCallback  # NOQA
  
      with pytest.raises(ImportError):
          from optuna.integration import unknown_module
  
label_desc: Use image node_id 1 for calling a global function with example usage: test_import() without return types