@Test
 public void deleteByIdShouldRemoveUser() throws Exception {
   helper.putAndGetJsonResponse("/user/id/999");
   helper.doDelete("/user/id/999");
   final HttpResponse rsp = helper.doGet("/user/id/999", APPLICATION_XML);
   assertEquals(404, rsp.getStatusLine().getStatusCode());
 }
 @Test
 public void getByInvalidNickShouldFailWith404() throws Exception {
   final HttpResponse rsp = helper.doGet("/user/nick/invalid", APPLICATION_XML);
   assertEquals(404, rsp.getStatusLine().getStatusCode());
 }