public void CalculateSetOfNPV_Given_All_Parameters_Is_Valid(
double initialCost
, double upperLimit
, double lowerLimit
, double increment)
{
var request = new CalculateSetOfNPVRequest
{
CashFlow = new List <double>
{
1000
, 1500
, 2000
, 2500
, 3000
},
UpperBoundDiscountRate = upperLimit
, LowerBoundDiscountRate = lowerLimit
, Increment = increment
, InitialCost = initialCost
};
var cashFlowSummary = string.Join(", ", request.CashFlow.ToArray());
var npvEngine = new NPVEngine.NPVEngine();
var expectedOutput = new List <NPVSet>();
while (lowerLimit <= upperLimit)
{
expectedOutput.Add(new NPVSet
{
CashFlowSummary = cashFlowSummary
, InitialCost = initialCost * -1
, DiscountRate = lowerLimit
, NPV = npvEngine.CalculateIndividualNPV(new CalculateIndividualNPVRequest
{
CashFlows = request.CashFlow
,
InitialValue = request.InitialCost
,
Interest = lowerLimit / 100
})
});
lowerLimit += increment;
}
var actualOutput = npvEngine.CalculateSetOfNPV(request);
for (var i = 0; i < expectedOutput.Count; i++)
{
Assert.AreEqual(expectedOutput[i].CashFlowSummary, actualOutput[i].CashFlowSummary);
Assert.AreEqual(expectedOutput[i].DiscountRate, actualOutput[i].DiscountRate);
Assert.AreEqual(Math.Round(expectedOutput[i].NPV, 2), actualOutput[i].NPV);
}
}
public void CalculateIndividualNPV_Shall_Satisfy_Expected(double interest, double initialValue, double expectedNPV)
{
var npvEngine = new NPVEngine.NPVEngine();
var cashFlows = new List <double> {
1000, 2000, 3000, 4000, 5000
};
var npv = npvEngine.CalculateIndividualNPV(
new CalculateIndividualNPVRequest
{
CashFlows = cashFlows
, Interest = interest
, InitialValue = initialValue
}
);
Assert.AreEqual(expectedNPV, Math.Round(npv, 2));
}
public void CalculateSetOfNPV_Given_Increment_Is_Invalid_Expect_Exception()
{
var npvEngine = new NPVEngine.NPVEngine();
var request = new CalculateSetOfNPVRequest
{
CashFlow = new List <double>
{
1000
, 1500
, 2000
, 2500
, 3000
},
UpperBoundDiscountRate = 1.5
,
LowerBoundDiscountRate = 1.0
,
Increment = .8
,
InitialCost = -1000
};
Assert.Throws <ArgumentException>(() => npvEngine.CalculateSetOfNPV(request));
}
