public void TestIdentityRate()
{
Bank bank = new Bank();
var actual = bank.Rate("USD", "USD");
Assert.Equal(1, actual);
}
public void TestReduceMoney()
{
Bank bank = new Bank();
Money actual = bank.Reduce(Money.Dollar(1), "USD");
Assert.Equal(Money.Dollar(1), actual);
}
public void TestReduceSum()
{
Expression sum = new Sum(Money.Dollar(3), Money.Dollar(4));
Bank bank = new Bank();
Money actual = bank.Reduce(sum, "USD");
Assert.Equal(Money.Dollar(7), actual);
}
public void TestReduceMoneyDifferentCurrency()
{
Bank bank = new Bank();
bank.AddRate("CHF", "USD", 2);
Money actual = bank.Reduce(Money.Franc(2), "USD");
Assert.Equal(Money.Dollar(1), actual);
}
public void TestSumTimes()
{
Expression fiveBucks = Money.Dollar(5);
Expression tenFrancs = Money.Franc(10);
Bank bank = new Bank();
bank.AddRate("CHF", "USD", 2);
Expression sum = new Sum(fiveBucks, tenFrancs).Times(2);
Money actual = bank.Reduce(sum, "USD");
Assert.Equal(Money.Dollar(20), actual);
}
public void TestSimpleAddition()
{
Money five = Money.Dollar(5);
Expression sum = five.Plus(five);
var bank = new Bank();
Money reduced = bank.Reduce(sum, "USD");
Assert.Equal(Money.Dollar(10), reduced);
}
public void TestMixedAddition()
{
Expression fiveBucks = Money.Dollar(5);
Expression tenFrancs = Money.Franc(10);
Bank bank = new Bank();
bank.AddRate("CHF", "USD", 2);
Money actual = bank.Reduce(fiveBucks.Plus(tenFrancs), "USD");
Assert.Equal(Money.Dollar(10), actual);
}
public Money Reduce(Bank bank, string toCurrency)
{
int amount = Augend.Reduce(bank, toCurrency).Amount
+ Addend.Reduce(bank, toCurrency).Amount;
return new Money(amount, toCurrency);
}
public Money Reduce(Bank bank, string toCurrency)
{
int rate = bank.Rate(Currency, toCurrency);
return new Money(Amount / rate, toCurrency);
}