@Test
public void getCartOfUser()
{

   User user = udao.read("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa3");
   ProductCart cart = dao.getCartOfUser(user);
   assertNotNull(cart);
   assertEquals(cart.getUUID(), "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa1");
   assertEquals(cart.getUser(), user, "User not owner of the found cart.");
   // No cart attached to User #1
   user = udao.read("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa1");
   cart = dao.getCartOfUser(user);
   assertNull(cart);
   // User #2 has 2 carts
   user = udao.read("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa2");
   cart = dao.getCartOfUser(user);
   assertNotNull(cart);
}