public void RoundTip_Total49_36TipPercent18_GrandTotal176()
        {
            var myCalculatorViewModel = new CalculatorPageViewModel(myCalculator, myTipCalcTransaction, myTipDatabase)
            {
                TotalTxt   = "149.36",
                TipPercent = 18
            };

            myCalculatorViewModel.RoundTotal();

            Assert.AreEqual("176.00", myCalculatorViewModel.GrandTotalTxt);
            Assert.AreEqual("26.64", myCalculatorViewModel.TipTxt);
        }
        public void RoundTipThenUnRoundTip_Total49_36TipPercent15_GrandTotal171_76()
        {
            var myCalculatorViewModel = new CalculatorPageViewModel(myCalculator, myTipCalcTransaction, myTipDatabase)
            {
                TotalTxt   = "149.36",
                TipPercent = 15
            };

            myCalculatorViewModel.RoundTotal();
            myCalculatorViewModel.UnRoundTotal();

            Assert.AreEqual("171.76", myCalculatorViewModel.GrandTotalTxt);
            Assert.AreEqual("22.40", myCalculatorViewModel.TipTxt);
        }