public void CalculateAnnualCosts(double consumption)
{
if (consumption < 0)
{
throw new ArgumentException("Argument should not be less than zero", nameof(consumption));
}
IAnnualCostsCalculationStrategy annualCostsCalculationStrategy;
switch (Name)
{
case TariffConstants.BasicTariffName:
annualCostsCalculationStrategy = new BasicAnnualCostsCalculationStrategy();
break;
case TariffConstants.PackagedTariffName:
annualCostsCalculationStrategy = new PackagedAnnualCostsCalculationStrategy();
break;
default:
throw new Exception("Unexpected name of tariff");
}
AnnualCosts = annualCostsCalculationStrategy.GetAnnualCosts(consumption);
}
public void GetAnnualCostsShouldThrowArgumentExceptionWhenConsumptionLessThanZero()
{
// Arrange
var packagedAnnualCostsCalculationStrategy = new PackagedAnnualCostsCalculationStrategy();
double consumption = -900;
// Act
packagedAnnualCostsCalculationStrategy.GetAnnualCosts(consumption);
}
public void GetAnnualCostsShouldReturn1010()
{
// Arrange
var packagedAnnualCostsCalculationStrategy = new PackagedAnnualCostsCalculationStrategy();
double consumption = 4700;
// Act
var result = packagedAnnualCostsCalculationStrategy.GetAnnualCosts(consumption);
// Assert
Assert.AreEqual(1010.00m, result);
}