public String getServerStatus() {
        try {
            NamingService namingService = nacosServiceManager.getNamingService();
            return namingService.getServerStatus();
        } catch (NacosException e) {
            LOGGER.log(Level.SEVERE, "get nacos server status failed", e);
        }
        return STATUS_UNKNOW;
    }
@Test
    public void testGetServerStatus() throws NacosException {
        mockNamingService();
        Assert.assertNull(nacosClient.getServerStatus());
    }