public void Can_get_rewardPointsHistoryBalance()
        {
            var customer = new Customer();
            customer.AddRewardPointsHistoryEntry(1, "Points for registration");
            //customer.AddRewardPointsHistoryEntry(3, "Points for registration");

            customer.GetRewardPointsBalance().ShouldEqual(1);
        }
        public void Can_add_rewardPointsHistoryEntry()
        {
            var customer = new Customer();
            customer.AddRewardPointsHistoryEntry(1, "Points for registration");

            customer.RewardPointsHistory.Count.ShouldEqual(1);
            customer.RewardPointsHistory.First().Points.ShouldEqual(1);
        }