@Test
     public void test() {
         User user = (User) MongoHelper.fetch(myUser, "users");
         if(user == null)
             TestHelper.failed("user not found");
         
         user.setFirstName("Evan");
         if(!MongoHelper.save(user, "users"))
             TestHelper.failed("first name update failed");
         
         user.setLastName("Van Dam");
         if(!MongoHelper.save(user, "users"))
             TestHelper.failed("last name update failed");
         
         User fetchedUser = (User) MongoHelper.fetch(user, "users");

         TestHelper.asserting(user.getFirstName().equals(fetchedUser.getFirstName()) && 
                 user.getLastName().equals(fetchedUser.getLastName()));
         System.out.println("updated user id: " + user.getId());
         
         TestHelper.passed();
     }