public void CalculateCosts_Given3500KWhInOneYear_Returns830()
{
BasicTariffCostsCalculation calculationUnderTest = CreateCalculation();
double actual = calculationUnderTest.CalculateCosts(periodInMonths: 12, consumptionInKWh: 3500);
Assert.Equal(830, actual);
}
public void CalculateCosts_Given0Months_ReturnsZero()
{
BasicTariffCostsCalculation calculationUnderTest = CreateCalculation();
double actual = calculationUnderTest.CalculateCosts(periodInMonths: 0, consumptionInKWh: 0);
Assert.Equal(0, actual);
}
public void CalculateCosts_Given0KWhInOneYear_ReturnsAnnualBaseCosts()
{
BasicTariffCostsCalculation calculationUnderTest = CreateCalculation();
double actual = calculationUnderTest.CalculateCosts(periodInMonths: 12, consumptionInKWh: 0);
Assert.Equal(12 * calculationUnderTest.BaseCostsPerMonth, actual);
}
public void CalculateCosts_GivenNegativeConsumption_Throws()
{
BasicTariffCostsCalculation calculationUnderTest = CreateCalculation();
Assert.ThrowsAny <ArgumentException>(() => calculationUnderTest.CalculateCosts(periodInMonths: 0, consumptionInKWh: -1));
}