public void setScheduledTaskQueueCapacity(int scheduledTaskQueueCapacity) {
        this.scheduledTaskQueueCapacity = checkPositive(scheduledTaskQueueCapacity, "scheduledTaskQueueCapacity");
    }
@Test
    public void test_setScheduledTaskQueueCapacity_whenZero() {
        ReactorBuilder builder = newBuilder();
        assertThrows(IllegalArgumentException.class, () -> builder.setScheduledTaskQueueCapacity(0));
    }