public void CalculateCosts_GivenAnnualBaseCostsLimitInKWh_ReturnsAnnualBaseCosts()
{
PackagedTariffCostsCalculation calculationUnderTest = CreateCalculation();
double actual = calculationUnderTest.CalculateCosts(periodInMonths: 12, calculationUnderTest.AnnualBaseCostsLimitInKWh);
Assert.Equal(calculationUnderTest.AnnualBaseCosts, actual);
}
public void CalculateCosts_Given0Months_ReturnsZero()
{
PackagedTariffCostsCalculation calculationUnderTest = CreateCalculation();
double actual = calculationUnderTest.CalculateCosts(periodInMonths: 0, consumptionInKWh: 0);
Assert.Equal(0, actual);
}
public void CalculateCosts_Given0KWhInOneYear_ReturnsAnnualBaseCosts()
{
PackagedTariffCostsCalculation calculationUnderTest = CreateCalculation();
double actual = calculationUnderTest.CalculateCosts(periodInMonths: 12, consumptionInKWh: 0);
Assert.Equal(calculationUnderTest.AnnualBaseCosts, actual);
}
public void CalculateCosts_GivenNegativeConsumption_Throws()
{
PackagedTariffCostsCalculation calculationUnderTest = CreateCalculation();
Assert.ThrowsAny <ArgumentException>(() => calculationUnderTest.CalculateCosts(periodInMonths: 0, consumptionInKWh: -1));
}