1. non-simplify mode:
```
dubbo://120.0.0.1:20880/org.apache.dubbo.demo.DemoService?key=value
```
the store path of ZK will be: `/dubbo/porg.apache.dubbo.demo.DemoService/url`

2. simplify mode:
```
dubbo://120.0.0.1:20880/org.apache.dubbo.demo.DemoService?key=value
```
the store path of ZK will be: `/dubbo/porg.apache.dubbo.demo.DemoService/url`

3. simplify mode with path specified:
```
dubbo://120.0.0.1:20880/path-value?key=value
```
the store path of ZK will be: `/dubbo/path-value/url`
assertEquals("dubbo", url.getProtocol());
        assertEquals("admin", url.getUsername());
        assertEquals("hello1234", url.getPassword());
        assertEquals("10.20.130.230", url.getHost());
        assertEquals(20880, url.getPort());
        assertEquals("context/path", url.getPath());
        assertEquals(2, url.getParameters().size());
        assertEquals("morgan", url.getParameter("application"));
        assertEquals("v1", url.getParameter("k1"));
        url = URL.valueOf("dubbo://admin:hello1234@10.20.130.230:20880/context/path?application=morgan");
        url = url.addParameter("application", "xxx");
        assertEquals("dubbo", url.getProtocol());
        assertEquals("admin", url.getUsername());
        assertEquals("hello1234", url.getPassword());
        assertEquals("10.20.130.230", url.getHost());
        assertEquals(20880, url.getPort());
        assertEquals("context/path", url.getPath());
        assertEquals(1, url.getParameters().size());
        assertEquals("xxx", url.getParameter("application"));
    }
    @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"));