public void Apply_CompatibleInstance_CorrectAmountAndCurrency()
{
var subject = new ExchangeRate(CurrencyIsoCode.EUR, CurrencyIsoCode.USD, 1.25m);
Money compatible = 10m.Eur();
Assert.That(subject.Apply(compatible), Must.Be.MoneyWith(12.5m, Currency.Usd));
}
public void ExchangeRate_CanBeExtendedTo_SupportCustomRateArithmetic()
{
var stock = new ExchangeRate(CurrencyIsoCode.EUR, CurrencyIsoCode.USD, 1.11111m);
var truncating = new ExtendsApply(CurrencyIsoCode.EUR, CurrencyIsoCode.USD, 1.11111m);
Assert.That(stock.Apply(1m.Eur()), Is.Not.EqualTo(truncating.Apply(1m.Eur())));
}
public void Apply_IncompatibleInstance_Exception()
{
var subject = new ExchangeRate(CurrencyIsoCode.EUR, CurrencyIsoCode.USD, 1.25m);
Money incompatible = 10m.Cad();
Assert.That(() => subject.Apply(incompatible), Throws
.InstanceOf <DifferentCurrencyException>()
.With.Message.Contains("EUR")
.And.Message.Contains("CAD"));
}
public Money To(CurrencyIsoCode to)
{
var rateCalculator = new ExchangeRate(_from.CurrencyCode, to, _rate);
return(rateCalculator.Apply(_from));
}