code: /** 
   * Test the simultaneous push to clear the override and the override for a certain provider See if override can take effect
   */
  @Test public void testNofityOverrideUrls_CleanNOverride(){
    RegistryDirectory registryDirectory=getRegistryDirectory();
    invocation=new RpcInvocation();
    List<URL> durls=new ArrayList<URL>();
    durls.add(SERVICEURL.setHost("10.20.30.140").addParameter("timeout","1"));
    registryDirectory.notify(durls);
    durls=new ArrayList<URL>();
    durls.add(URL.valueOf("override://0.0.0.0?timeout=3"));
    durls.add(URL.valueOf("override://0.0.0.0"));
    durls.add(URL.valueOf("override://10.20.30.140:9091?timeout=4"));
    registryDirectory.notify(durls);
    List<Invoker<?>> invokers=registryDirectory.list(invocation);
    Invoker<?> aInvoker=invokers.get(0);
    Assert.assertEquals("4",aInvoker.getUrl().getParameter("timeout"));
  }
  