public void PercentCalculateTestThrows(double price, double value)
{
var discount = new PercentDiscount(value);
Assert.That(() => discount.Calculate(price), Throws.TypeOf <ArgumentException>());
}
public void PercentCalculateTest(double price, double value, double result)
{
var discount = new PercentDiscount(value);
Assert.That(() => discount.Calculate(price), Is.EqualTo(result));
}
