public void TestSimpleAddition()
{
Money five = Money.Dollar(5);
IMoneyExpression sum = five.Plus(five);
Bank bank = new Bank();
Money reduced = bank.Reduce(sum, "USD");
Assert.Equal(Money.Dollar(10), reduced);
}
public void TestPlusReturnsSum()
{
Money five = Money.Dollar(5);
IMoneyExpression result = five.Plus(five);
Sum sum = (Sum)result;
Assert.Equal(five, sum.Augend);
Assert.Equal(five, sum.Addend);
}
public void TestMixedAddition()
{
IMoneyExpression fiveBucks = Money.Dollar(5);
IMoneyExpression tenFrancs = Money.Franc(10);
Bank bank = new Bank();
bank.AddRate("CHF", "USD", 2);
Money result = bank.Reduce(fiveBucks.Plus(tenFrancs), "USD");
Assert.Equal(Money.Dollar(10), result);
}
public void sum_of_two_franc_with_one_dollar__equals_to_two_dollar() // 2 CHF + 1 USD = 2 USD
{
IMoneyExpression franc = Money.Franc(2);
IMoneyExpression dollar = Money.Dollar(1);
var bank = new Bank();
bank.AddRate("USD", "CHF", 2);
bank.AddRate("CHF", "USD", 0.5m);
var reducedAmount = bank.Reduce(dollar.Plus(franc), "USD");
var expected = Money.Dollar(2);
reducedAmount.Should().Be(expected);
}
public void TestSumPlusMoney()
{
IMoneyExpression fiveBucks = Money.Dollar(5);
IMoneyExpression tenFrancs = Money.Franc(10);
Bank bank = new Bank();
bank.AddRate("CHF", "USD", 2);
IMoneyExpression sum =
new Sum(fiveBucks, tenFrancs).Plus(fiveBucks);
Money result = bank.Reduce(sum, "USD");
Assert.Equal(Money.Dollar(15), result);
}
public Money Reduce(IMoneyExpression expression, string toCurrency)
{
return(expression.Reduce(toCurrency, this));
}
private static Money Evaluate(IMoneyExpression moneyExpression, Func <Money, Money> round, Func <IMoneyExpression, Money> total) => round(total(moneyExpression));
public static IMoneyExpression Subtract(this IMoneyExpression minuend, IMoneyExpression subtrahend) => new MoneySum(minuend, new MoneyProduct(subtrahend, -1));
public IMoneyExpression Plus(IMoneyExpression addend)
{
return(new Sum(this, addend));
}
public static Money Evaluate(this IMoneyExpression moneyExpression, Option <MoneyEvaluationContext> context = default) => Evaluate(moneyExpression, Round(context), CalculateTotal(context));
public IMoneyExpression Plus(IMoneyExpression moneyExpression)
{
return(new Sum(this, moneyExpression));
}
public static IMoneyExpression Add(this IMoneyExpression augend, IMoneyExpression addend) => new MoneySum(augend, addend);
public static IEnumerable <IMoneyExpression> Distribute(this IMoneyExpression moneyExpression, int numberOfSlices, Option <decimal> precision = default) => moneyExpression.Distribute(Enumerable.Repeat(element: 1, count: numberOfSlices), precision);
public static IEnumerable <IMoneyExpression> Distribute(this IMoneyExpression moneyExpression, IEnumerable <int> factors, Option <decimal> precision = default) => new MoneyDistribution(moneyExpression, factors, precision);
public static IMoneyExpression Multiply(this IMoneyExpression multiplicand, decimal multiplier) => new MoneyProduct(multiplicand, multiplier);
public static IMoneyExpression Divide(this IMoneyExpression dividend, decimal divisor) => new MoneyProduct(dividend, 1.0m / divisor);
public static string ToHumanReadable(this IMoneyExpression moneyExpression) => moneyExpression.Accept(ToHumanReadableVisitor.Instance);
public Sum(IMoneyExpression augEnd, IMoneyExpression addEnd)
{
AugEnd = augEnd;
AddEnd = addEnd;
}
public Money Reduce(IMoneyExpression source, String to)
{
return(source.Reduce(this, to));
}