public static Builder builder() {
        return new Builder();
    }
@Test
    public void testEqualsAndHashCode() {
        CommonUpstream commonUpstream = new CommonUpstream();
        commonUpstream.setProtocol("protocol");
        commonUpstream.setUpstreamHost("host");
        commonUpstream.setUpstreamUrl("url");
        commonUpstream.setStatus(true);
        commonUpstream.setTimestamp(1650549243L);
        
        ZombieUpstream upstream1 = ZombieUpstream.builder().selectorId("id").zombieCheckTimes(10)
                .commonUpstream(commonUpstream).build();
        ZombieUpstream upstream2 = ZombieUpstream.builder().selectorId("id").zombieCheckTimes(10)
                .commonUpstream(commonUpstream).build();
        
        assertThat(ImmutableSet.of(upstream1, upstream2), hasSize(1));
    }