public static String getGroupName(final String serviceNameWithGroup) {
        if (StringUtils.isBlank(serviceNameWithGroup)) {
            return StringUtils.EMPTY;
        }
        if (!serviceNameWithGroup.contains(Constants.SERVICE_INFO_SPLITER)) {
            return Constants.DEFAULT_GROUP;
        }
        return serviceNameWithGroup.split(Constants.SERVICE_INFO_SPLITER)[0];
    }
@Test
    void testGetGroupNameWithEmpty() {
        assertEquals(StringUtils.EMPTY, NamingUtils.getGroupName(null));
    }