public List<String> getNamingAddrs() {
        String namingAddrsKey = String.join(FILE_CONFIG_SPLIT_CHAR, FILE_ROOT_REGISTRY, REGISTRY_TYPE, NAMING_SERVICE_URL_KEY);

        String urlListStr = FILE_CONFIG.getConfig(namingAddrsKey);
        if (urlListStr.isEmpty()) {
            throw new NamingRegistryException("Naming server url can not be null!");
        }
        return Arrays.stream(urlListStr.split(",")).collect(Collectors.toList());
    }
@Test
    public void getNamingAddrsTest() {
        NamingserverRegistryServiceImpl namingserverRegistryService = NamingserverRegistryServiceImpl.getInstance();
        List<String> list = namingserverRegistryService.getNamingAddrs();
        assertEquals(list.size(), 1);
    }