public void test_currency_exchange_to_another_currency()
{
//Given
var usd = Currency.Create("USD", 2);
var fiveTWD = FakeMoneyBuilder.CreateTWD(5);
//When
var bucks = exchange.ExchangeTo(fiveTWD, usd);
//Then
Assert.True(bucks.Currency.Equals(usd));
Assert.Equal(1, bucks.Amount);
}