public static String getGroupedNameOptional(final String serviceName, final String groupName) {
        return groupName + Constants.SERVICE_INFO_SPLITER + serviceName;
    }
@Test
    void testGetGroupedNameOptional() {
        String onlyGroupName = NamingUtils.getGroupedNameOptional(StringUtils.EMPTY, "groupA");
        assertEquals("groupA@@", onlyGroupName);
        
        String onlyServiceName = NamingUtils.getGroupedNameOptional("serviceA", StringUtils.EMPTY);
        assertEquals("@@serviceA", onlyServiceName);
        
        String groupNameAndServiceName = NamingUtils.getGroupedNameOptional("serviceA", "groupA");
        assertEquals("groupA@@serviceA", groupNameAndServiceName);
    }