public static string Add(string addend1, string addend2)
{
var numericAddend1 = NumeralConverter.ToArabic(addend1);
var numericAddend2 = NumeralConverter.ToArabic(addend2);
var sum = numericAddend1 + numericAddend2;
return(ArabicConverter.ToNumeral(sum));
}
public void ConvertArabicToNumeral_WhenPassedANonBaseValue_ReturnsTheCorrectNumeral()
{
const int number = 19;
const string expected = "XIX";
var result = ArabicConverter.ToNumeral(number);
result.Should().Be(expected);
}
public void ConvertArabicToNumeral_WhenPassed5_ReturnsV()
{
const int number = 5;
const string expected = "V";
var result = ArabicConverter.ToNumeral(number);
result.Should().Be(expected);
}
public void ConvertArabicToNumeral_WhenPassedANumberOverMaximum_Throws()
{
const int overMaximum = ArabicConverter.MaximumNumeralValue + 1;
Assert.Throws <ArgumentOutOfRangeException>(() => ArabicConverter.ToNumeral(overMaximum));
}
public void ConvertArabicToNumeral_WhenPassedANumberUnderMinimum_Throws()
{
const int underMinimum = ArabicConverter.MinimumNumeralValue - 1;
Assert.Throws <ArgumentOutOfRangeException>(() => ArabicConverter.ToNumeral(underMinimum));
}