@Transactional(propagation = Propagation.REQUIRED, isolation = Isolation.SERIALIZABLE,
            readOnly = false, rollbackFor = MovieCatalogException.class)
    public void add(User user) throws MovieCatalogSystemException, EntityAlreadyExistsException, ValidationMovieCatalogException, CantAddEntityException {

        userDao.alreadyExists(user);
        UserValidator.validate(user);
        userDao.add(user);

    }

    @Transactional(propagation = Propagation.REQUIRED, isolation = Isolation.SERIALIZABLE,
            readOnly = false, rollbackFor = MovieCatalogException.class)
    public void delete(User user) throws CantDeleteEntityException, MovieCatalogSystemException {

        String tr = TransactionSynchronizationManager.getCurrentTransactionName(); // for debug
        userDao.delete(user);

    }

    @Test
    public void DeleteExistingUser() throws MovieCatalogException {

        User user = new User("test", randomEnglishSymbolString(10), randomEmail());
        userService.add(user);
        userService.delete(user);

    }

public class UserTest {

    private ApplicationContext context;
    private UserService userService;

    @Before
    public void setUp(){


        context = new ClassPathXmlApplicationContext("context-test.xml");
        userService = (UserService) context.getBean("UserService");

    }

    @Test
    public void testAddNewUniqueUser() throws MovieCatalogException {

        User user = new User(randomEnglishSymbolString(20), randomEnglishSymbolString(10), randomEmail());
        userService.add(user);

        User userFromDb = userService.getById(user.getId());

        if(!user.equals(userFromDb)){
            throw new AssertionError("New user isn't equal to new user from DB.");
        }
    }

    @Transactional(propagation = Propagation.SUPPORTS, readOnly = true)
    public List<MovieCatalogEntity> list() throws MovieCatalogSystemException, CantGetEntityListException {

        return userDao.list();

    }