def METHOD_NAME(self):
    (operator, dq) = self.build_seed()
    func: Callable = lambda x: x.split(" ")
    try:
        flatted = dq.flatmap(func)
        self.validate_flatmap(flatted, operator)
    except PywyException as e:
        self.assertTrue("the return for the FlatmapFunction is not Iterable" in str(e))