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`
assertTrue(url.isLocalHost());
    }
    @Test
    public void test_Path() throws Exception {
        URL url = new URL("dubbo", "localhost", 20880, "////path");
        assertEquals("path", url.getPath());
    }
    @Test
    public void testAddParameters() throws Exception {
        URL url = URL.valueOf("dubbo://127.0.0.1:20880");
        Map<String, String> parameters = new HashMap<String, String>();
        parameters.put("version", null);
        url.addParameters(parameters);
    }
    @Test
    public void testUserNamePasswordContainsAt(){
        
        URL url = URL.valueOf("ad@min:hello@1234@10.20.130.230:20880/context/path?version=1.0.0&application=morgan");
        assertNull(url.getProtocol());
        assertEquals("ad@min", url.getUsername());
        assertEquals("hello@1234", url.getPassword());
        assertEquals("10.20.130.230", url.getHost());
        assertEquals(20880, url.getPort());
        assertEquals("context/path", url.getPath());
        assertEquals(2, url.getParameters().size());
        assertEquals("1.0.0", url.getParameter("version"));
        assertEquals("morgan", url.getParameter("application"));
    }
    @Test
    public void testIpV6Address(){