public NpvResultModel Npv(NpvDataModel model)
{
if (model.InitialInvestment != 0)
{
model.CashFlows.Insert(0, -model.InitialInvestment);
model.InitialInvestment = 0;
}
var npv = model.CashFlows.Select((c, n) => c / Math.Pow(1 + (model.DiscountRate / 100), n)).Sum();
return(new NpvResultModel
{
DiscountRate = model.DiscountRate,
NetPresentValue = Math.Round(npv, 2)
});
}
public void Npv()
{
// Arrange
var helper = new ComputeService();
var model = new NpvDataModel()
{
InitialInvestment = 150000,
CashFlows = new List <double> {
50000, 25000
},
DiscountRate = 1.2
};
// Act
var result = helper.Npv(model);
// Assert
Assert.IsTrue(result is NpvResultModel);
Assert.AreEqual(1.2, result.DiscountRate);
Assert.AreEqual(-76182.26, result.NetPresentValue);
}
public IHttpActionResult Post([FromBody] NpvDataModel model)
{
return(Ok(_computeSevice.Npv(model)));
}
