code: @Test public void testRevertForbid(){
    String service="dubbo.test.api.HelloService";
    List<String> forbid=new ArrayList<String>();
    forbid.add(service);
    Set<URL> subscribed=new HashSet<URL>();
    subscribed.add(URL.valueOf("dubbo://127.0.0.1:20880/" + service + "?group=perf&version=1.0.0"));
    List<String> newForbid=UrlUtils.revertForbid(forbid,subscribed);
    List<String> expectForbid=new ArrayList<String>();
    expectForbid.add("perf/" + service + ":1.0.0");
    assertEquals(expectForbid,newForbid);
  }
  