@Test
    public void testRetrack()throws Exception{

        Tracking tracking = new Tracking("RT224265042HK");
        tracking.setSlug("hong-kong-post");
        try{
            connection.retrack(tracking);
            assertTrue("This never should be executed",false);

        }catch (Exception e){
            assertTrue(e.getMessage().contains("4016"));
            assertTrue(e.getMessage().contains("Retrack is not allowed. You can only retrack each shipment once."));

        }
    }