`latest` is greater than `interval`

Raise code

            raise ScheduleValueError(
                "Invalid unit (valid units are `seconds`, `minutes`, `hours`, "
                "`days`, and `weeks`)"
            )

        if self.latest is not None:
            if not (self.latest >= self.interval):
                raise ScheduleError("`latest` is greater than `interval`")
            interval = random.randint(self.interval, self.latest)
        else:
            interval = self.interval

        self.period = datetime.timedelta(**{self.unit: interval})
        self.next_run = datetime.datetime.now() + self.period
        if self.start_day is not None: