public void ShouldReturn0WhenAMountIs0()
{
var calculator = new FlateRateCalculator();
var result = calculator.CalulateTax(0);
Assert.AreEqual(0m, result);
}
public void ShouldRetur17AndAHalfPercentForAllValidAmounts()
{
var calculator = new FlateRateCalculator();
var result = calculator.CalulateTax(10000);
Assert.AreEqual(1750m, result);
}
public void ShouldThrowInvalidAmountExcetionWhenANegativeAmount()
{
var calculator = new FlateRateCalculator();
Assert.Throws <InvalidFlatTaxAmountException>(() => calculator.CalulateTax(-200000));
}