public void Round__Scale_Specified__Produces_Correct_Result(string a, string b)
{
Money18
.Round(Money18.Parse(a), 2)
.Should()
.Be(b);
}
public async Task WhenConversionIsMade_ConversionShoudBeValid()
{
var currencyRateModels = new List <CurrencyRateModel>
{
new CurrencyRateModel {
BaseAsset = _token, QuoteAsset = "USD", Rate = 2M
},
new CurrencyRateModel {
BaseAsset = "USD", QuoteAsset = "AED", Rate = 3.67M
},
new CurrencyRateModel {
BaseAsset = "USD", QuoteAsset = "NZD", Rate = 1.58M
},
new CurrencyRateModel {
BaseAsset = "AED", QuoteAsset = "USD", Rate = 0.25M
},
new CurrencyRateModel {
BaseAsset = "AED", QuoteAsset = "EUR", Rate = 0.25M
},
new CurrencyRateModel {
BaseAsset = "EUR", QuoteAsset = "GBP", Rate = 0.89M
},
new CurrencyRateModel {
BaseAsset = "EUR", QuoteAsset = "BGN", Rate = 1.96M
},
};
// Arrange
_currencyConvertorClientMock.Setup(c => c.CurrencyRates.GetAllAsync())
.ReturnsAsync(() =>
{
return(currencyRateModels);
});
// Act
var initialAmount = Money18.Create(200);
var forwardConversion = await _service.CalculateConversionRate(10, 2, _token, "BGN");
var convertedAmount = forwardConversion * initialAmount;
var backwardConversion = await _service.CalculateConversionRate(10, 2, "BGN", _token);
var revertedAmount = backwardConversion * convertedAmount;
Money18 expected = (Money18)currencyRateModels[1].Rate;
expected *= (Money18)currencyRateModels[4].Rate;
expected *= (Money18)currencyRateModels[6].Rate;
expected *= (Money18)(10M / 2M);
// Assert
Assert.Equal(expected, forwardConversion);
// Due to the amount of operations, 18 digits after the decimal point are exceeded
// and thus rounded, which leads to 4 to 6 digits difference between the initial and
// the end value
Assert.Equal(Money18.Round(initialAmount, 10), Money18.Round(revertedAmount, 10));
}
public void Round__All_MidpointRounding_Modes_Are_Supported()
{
foreach (var mode in Enum.GetValues(typeof(MidpointRounding)).Cast <MidpointRounding>())
{
// ReSharper disable once ReturnValueOfPureMethodIsNotUsed
Action round = () => Money18.Round(0.5m, mode);
round
.Should()
.NotThrow();
}
}