code: @Test public void testRevertNotify(){
    String key="dubbo.test.api.HelloService";
    Map<String,Map<String,String>> notify=new HashMap<String,Map<String,String>>();
    Map<String,String> service=new HashMap<String,String>();
    service.put("dubbo://127.0.0.1:20880/com.xxx.XxxService","group=perf&version=1.0.0");
    notify.put(key,service);
    Map<String,Map<String,String>> newRegister=UrlUtils.revertNotify(notify);
    Map<String,Map<String,String>> expectedRegister=new HashMap<String,Map<String,String>>();
    service.put("dubbo://127.0.0.1:20880/com.xxx.XxxService","group=perf&version=1.0.0");
    expectedRegister.put("perf/dubbo.test.api.HelloService:1.0.0",service);
    assertEquals(expectedRegister,newRegister);
  }
  