public List<Upstream> findUpstreamListBySelectorId(final String selectorId) {
        return task.getHealthyUpstream().get(selectorId);
    }
@Test
    @Order(4)
    public void findUpstreamListBySelectorIdTest() {
        final UpstreamCacheManager upstreamCacheManager = UpstreamCacheManager.getInstance();
        Assertions.assertNull(upstreamCacheManager.findUpstreamListBySelectorId(SELECTOR_ID));
    }