code: @Test public void testGetKey(){
    String interfaceName="interface";
    String method="method";
    String group="group";
    String version="1.0";
    String suffix="suffix";
    Map<String,String> para=new HashMap<>();
    para.put(Constants.INTERFACE_KEY,interfaceName);
    para.put(Constants.GROUP_KEY,group);
    para.put(Constants.VERSION_KEY,version);
    URL url=new URL("dubbo","localhost",20880,interfaceName,para);
    Assert.assertEquals(StaticContext.getKey(url,method,suffix),StaticContext.getKey(para,method,suffix));
  }
  