public void ShouldThroughArgumentException(double consumption)
{
// Arrange
var basicTariff = new BasicTariff();
// Act
// Assert
Assert.Throws <ArgumentException>(() => basicTariff.GetAnnualCosts(consumption), "Should throw ArgumentException when consumption less 0");
}
public void ShouldReturnValidAnnualCosts(int consumption, int cost)
{
// Arrange
var basicTariff = new BasicTariff();
// Act
var annualCosts = basicTariff.GetAnnualCosts(consumption);
// Assert
Assert.AreEqual(cost, annualCosts, "Annual cost calculated incorrectly");
}