public void CalcMarginPercentageTest(object purchasePrice, object salesPrice, object result)
        {
            var assert = Math.Round(
                Percentage.CalculateMarginPercentage(
                    Convert.ToDecimal(salesPrice),
                    Convert.ToDecimal(purchasePrice)), 4);

            Assert.AreEqual(Convert.ToDecimal(result), assert);
        }
        public void CalcMarginPercentageDevideByZeroTest()
        {
            var result = Percentage.CalculateMarginPercentage(100, 0);

            Assert.AreEqual(1, result);
        }