def METHOD_NAME(self):
    X_train, X_test, y_train, y_test, num_feature_names, \
        cat_feature_names = create_simple_titanic_data()
    assert X_train is not None
    assert X_test is not None
    assert y_train is not None
    assert y_test is not None
    assert num_feature_names is not None
    assert cat_feature_names is not None