### Question:
ProductCartService extends WebService { @PreAuthorize("hasRole('ROLE_DOWNLOAD')") @Transactional(readOnly = true, propagation = Propagation.REQUIRED) public ProductCart getCartOfUser(String uuid) throws UserNotExistingException { return getCartOfUser(getUser(uuid)); }  @PreAuthorize("hasRole('ROLE_DOWNLOAD')") @Transactional(readOnly = false, propagation = Propagation.REQUIRED) ProductCart createCartOfUser(String uuid); @PreAuthorize("hasRole('ROLE_DOWNLOAD')") @Transactional(readOnly = false, propagation = Propagation.REQUIRED) ProductCart createCartOfUser(User user); @PreAuthorize("hasRole('ROLE_DOWNLOAD')") @Transactional(readOnly = false, propagation = Propagation.REQUIRED) void deleteCartOfUser(String uuid); @PreAuthorize("hasRole('ROLE_DOWNLOAD')") @Transactional(readOnly = true, propagation = Propagation.REQUIRED) ProductCart getCartOfUser(String uuid); @PreAuthorize("hasRole('ROLE_DOWNLOAD')") @Transactional(readOnly = true, propagation = Propagation.REQUIRED) ProductCart getCartOfUser(User user); @PreAuthorize("hasRole('ROLE_DOWNLOAD')") @Transactional(propagation = Propagation.REQUIRED) void addProductToCart(String uuid, Long p_id); @PreAuthorize("hasRole('ROLE_DOWNLOAD')") @Transactional(propagation = Propagation.REQUIRED) void removeProductFromCart(String uuid, Long p_id); @PreAuthorize("hasRole('ROLE_DOWNLOAD')") @Transactional(propagation = Propagation.REQUIRED) List<Long> getProductsIdOfCart(String uuid); @PreAuthorize("hasRole('ROLE_DOWNLOAD')") @Transactional(readOnly = true, propagation = Propagation.REQUIRED) List<Product> getProductsOfCart(String uuid, int skip, int top); @PreAuthorize("hasRole('ROLE_DOWNLOAD')") @Transactional(readOnly = true, propagation = Propagation.REQUIRED) int countProductsInCart(String uuid); @PreAuthorize("hasRole('ROLE_DOWNLOAD')") @Transactional(readOnly = true) int countProducts(CartSQLVisitor visitor, String uuid); @PreAuthorize("hasRole('ROLE_DOWNLOAD')") @Transactional(readOnly = true) List<Product> getCartProducts(CartSQLVisitor visitor, String uuid, int skip, int top); @PreAuthorize("hasRole('ROLE_DOWNLOAD')") @Transactional(readOnly = true, propagation = Propagation.REQUIRED) boolean hasProducts(String uuid); @PreAuthorize("hasRole('ROLE_DOWNLOAD')") @Transactional(propagation = Propagation.REQUIRED) void clearCart(String uuid);  }### Answer:
@Test (priority=1) public void getCartOfUser() { ProductCart cart = pcs.getCartOfUser("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa0"); Assert.assertEquals (cart.getUUID(), "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa0"); cart = pcs.getCartOfUser("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa3"); Assert.assertEquals (cart.getUUID(), "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa1"); cart = pcs.getCartOfUser("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa1"); Assert.assertNull(cart); cart = pcs.getCartOfUser("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa2"); Assert.assertEquals (cart.getUUID(), "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa2"); }