public void CheckDayOffset()
        {
            var cashAccount = new Account(Session)
            {
                Debit = 300, Type = AccountTypeEnum.Cash
            };

            Session.CommitChanges();
            Andrew.DepositAmount(30);
            Session.CommitChanges();
            VideoRentDateTime.AddDays(2);
            Alex.DepositAmount(30);
            Session.CommitChanges();
            VideoRentDateTime.AddDays(2);
            Andrew.DepositAmount(30);
            Session.CommitChanges();
            Assert.IsTrue((VideoRentDateTime.Now - Andrew.LastPayDate()).Days == 4);
            Assert.IsTrue((VideoRentDateTime.Now - Alex.LastPayDate()).Days == 2);
        }