public static UpstreamCacheManager getInstance() {
        return INSTANCE;
    }
@Test
    @Order(1)
    public void initUpstreamCacheManagerTest() throws InterruptedException {
        final ShenyuConfig shenyuConfig = new ShenyuConfig();
        shenyuConfig.getUpstreamCheck().setEnabled(true);
        shenyuConfig.getUpstreamCheck().setPrintEnabled(true);
        shenyuConfig.getUpstreamCheck().setPrintInterval(1);
        Singleton.INST.single(ShenyuConfig.class, shenyuConfig);
        Assertions.assertNotNull(UpstreamCacheManager.getInstance());
        Thread.sleep(3);
    }