code: @Test public void test_addParameters_SameKv() throws Exception {
  {
      URL url=URL.valueOf("dubbo://admin:hello1234@10.20.130.230:20880/context/path?application=morgan&k1=v1");
      URL newUrl=url.addParameters(CollectionUtils.toStringMap("k1","v1"));
      assertSame(url,newUrl);
    }
  {
      URL url=URL.valueOf("dubbo://admin:hello1234@10.20.130.230:20880/context/path?application=morgan&k1=v1&k2=v2");
      URL newUrl=url.addParameters(CollectionUtils.toStringMap("k1","v1","k2","v2"));
      assertSame(newUrl,url);
    }
  }
  