public void AnnualPowerUsage_TariffWithNoGas_ReturnsNothing()
{
// Arrange
var tariff = new Tariff("test", null, null, 3m);
// Act
var actual = FuelCalculator.AnnualPowerUsage(tariff, TaxedValue.FromPreTaxValue(100, x => x));
// Assert
actual.HasValue.Should().BeFalse();
}
public void AnnualPowerUsage_TariffWithGas_ReturnsUsage()
{
// Arrange
var tariff = new Tariff("test", 2m, null, 3m);
// Act
var actual = FuelCalculator.AnnualPowerUsage(tariff, TaxedValue.FromPreTaxValue(100, x => x));
// Assert
actual.HasValue.Should().BeTrue();
actual.Value.Value.Should().Be((100 - 3) * 12 * 2);
}