code:     public void testSetParameterAndAttributeNames() throws Exception {
          interceptor.setAttributeName("hello");
          interceptor.setParameterName("world");
  
          params.put("world", Locale.CHINA);
          interceptor.intercept(mai);
  
          assertNull(params.get("world")); // should have been removed
  
          assertNotNull(session.get("hello")); // should be stored here
          assertEquals(Locale.CHINA, session.get("hello"));
      }
  