public void CummulativeGrowthTest() { var bTransactionEntry = new TransactionEntry() { Saldo = 248, Date = new DateTime(2018, 06, 01).ToString("o") }; var eTransactionEntry = new TransactionEntry() { Saldo = 100, Date = new DateTime(2018, 01, 01).ToString("o") }; var change = OperationsService.CompoundGrowthRate(bTransactionEntry, eTransactionEntry); Assert.IsTrue(Math.Abs(change - 20) < 1); }