public void Exchange_currency_then_return_assign_currency_and_correct_amount()
{
//Given
IExchangeService exchange = new ExchangeService();
var tenFranc = FakeDataBuilder.MakeFranc(10);
exchange.AddRate("CHF", "USD", 2);
//When
ICurrencyExpression result = exchange.Exchange(tenFranc, "USD");
//Then
Assert.Equal(FakeDataBuilder.MakeDollar(5), result);
}
public void After_AddRate_then_input_currency_get_Rate()
{
//Given
string fakeFranc = "CHF";
string fakeDollar = "USD";
int fakeRate = 2;
IExchangeService exchange = new ExchangeService();
exchange.AddRate(fakeFranc, fakeDollar, fakeRate);
//When
int actual = exchange.Rate(fakeFranc, fakeDollar);
//Then
Assert.Equal(fakeRate, actual);
}
public void Invalid_paramsters_to_AddRate_then_throw_exception(
string source,
string to,
int rate,
string errorMessage
)
{
//Given
IExchangeService exchange = new ExchangeService();
//When
ArgumentException exception = Assert.Throws <ArgumentException>(
() => exchange.AddRate(source, to, rate)
);
//Then
Assert.Contains(errorMessage, exception.Message);
}
public void Sum_and_Times_N_and_ExchangeTo_then_return_correct_total()
{
//Given
IExchangeService service = new ExchangeService();
var tenBucks = FakeDataBuilder.MakeDollar(10);
var fiveBucks = FakeDataBuilder.MakeDollar(5);
service.AddRate("CHF", "USD", 2);
//When
ICurrencyExpression result = service
.Sum(new Money[] { tenBucks, fiveBucks })
.Times(2)
.ExchangeTo("USD");
//Then
Assert.Equal(FakeDataBuilder.MakeDollar(30), result);
}
public void After_ExchangeTo_currency_then_clean_ExpressionList()
{
//Given
IExchangeService exchange = new ExchangeService();
var fiveBucks = FakeDataBuilder.MakeDollar(5);
var tenFranc = FakeDataBuilder.MakeFranc(10);
exchange.AddRate("CHF", "USD", 2);
//When
ICurrencyExpression sameParamSum = exchange
.Sum(new Money[] { fiveBucks, fiveBucks })
.ExchangeTo("USD");
int counts = exchange.ExpressionsList.Count();
//Then
Assert.Equal(0, counts);
}
public void Invalid_parameters_to_Rate_then_throw_exception(
string source,
string to,
string errorMessage
)
{
//Given
IExchangeService service = new ExchangeService();
service.AddRate("CHF", "USD", 2);
//When
ArgumentException exception = Assert.Throws <ArgumentException>(
() => service.Rate(source, to)
);
//Then
Assert.Contains(errorMessage, exception.Message);
}
public void AddRate_Then_RatesList_have_value()
{
//Given
string fakeFranc = "CHF";
string fakeDollar = "USD";
int fakeRate = 2;
IExchangeService exchange = new ExchangeService();
exchange.AddRate(fakeFranc, fakeDollar, fakeRate);
//When
var pair = new Pair(fakeFranc, fakeDollar);
bool pairExist = exchange.RatesList.ContainsKey(pair);
int rate = (int)exchange.RatesList[pair];
//Then
Assert.True(pairExist);
Assert.Equal(fakeRate, rate);
}
public void ExchangeTo_then_return_correct_currency()
{
//Given
ExchangeService service = new ExchangeService();
service.AddRate("CHF", "USD", 2);
//When
ICurrencyExpression result = service
.Sum(
new ICurrencyExpression[]
{
FakeDataBuilder.MakeDollar(5),
FakeDataBuilder.MakeFranc(10)
}).ExchangeTo("USD");
//Then
Assert.Equal(FakeDataBuilder.MakeDollar(10), result);
}
