public void setClockRefreshPeriod(int clockRefreshPeriod) {
        this.clockRefreshPeriod = checkNotNegative(clockRefreshPeriod, "clockRefreshPeriod");
    }
@Test
    public void test_setClockRefreshPeriod_whenZero() {
        ReactorBuilder builder = newBuilder();
        builder.setClockRefreshPeriod(0);
    }