public void IntToRomanTest()
{
Assert.Equal("", RomanNumbers.IntToRoman(0));
Assert.Equal("I", RomanNumbers.IntToRoman(1));
Assert.Equal("II", RomanNumbers.IntToRoman(2));
Assert.Equal("III", RomanNumbers.IntToRoman(3));
Assert.Equal("IV", RomanNumbers.IntToRoman(4));
Assert.Equal("V", RomanNumbers.IntToRoman(5));
Assert.Equal("VI", RomanNumbers.IntToRoman(6));
Assert.Equal("VII", RomanNumbers.IntToRoman(7));
Assert.Equal("VIII", RomanNumbers.IntToRoman(8));
Assert.Equal("IX", RomanNumbers.IntToRoman(9));
Assert.Equal("X", RomanNumbers.IntToRoman(10));
Assert.Equal("XX", RomanNumbers.IntToRoman(20));
Assert.Equal("XXX", RomanNumbers.IntToRoman(30));
Assert.Equal("XL", RomanNumbers.IntToRoman(40));
Assert.Equal("L", RomanNumbers.IntToRoman(50));
Assert.Equal("LX", RomanNumbers.IntToRoman(60));
Assert.Equal("LXX", RomanNumbers.IntToRoman(70));
Assert.Equal("LXXX", RomanNumbers.IntToRoman(80));
Assert.Equal("XC", RomanNumbers.IntToRoman(90));
Assert.Equal("C", RomanNumbers.IntToRoman(100));
Assert.Equal("CC", RomanNumbers.IntToRoman(200));
Assert.Equal("CCC", RomanNumbers.IntToRoman(300));
Assert.Equal("CD", RomanNumbers.IntToRoman(400));
Assert.Equal("D", RomanNumbers.IntToRoman(500));
Assert.Equal("DC", RomanNumbers.IntToRoman(600));
Assert.Equal("DCC", RomanNumbers.IntToRoman(700));
Assert.Equal("DCCC", RomanNumbers.IntToRoman(800));
Assert.Equal("CM", RomanNumbers.IntToRoman(900));
Assert.Equal("M", RomanNumbers.IntToRoman(1000));
Assert.Equal("MMMMM", RomanNumbers.IntToRoman(5000));
Assert.Equal("MMXVIII", RomanNumbers.IntToRoman(2018));
Assert.Equal("MMCCCLXV", RomanNumbers.IntToRoman(2365));
Assert.Throws <ArgumentOutOfRangeException>(() => RomanNumbers.IntToRoman(-1));
}
public void RomanToIntTest()
{
for (var i = 0; i < 1000; i++)
{
Assert.Equal(i, RomanNumbers.RomanToInt(RomanNumbers.IntToRoman(i)));
}
Assert.Equal(1444, RomanNumbers.RomanToInt("MCDXLIV"));
Assert.Equal(1444, RomanNumbers.RomanToInt("MCCCCXXXXIIII"));
Assert.Equal(2999, RomanNumbers.RomanToInt("MMCMXCIX"));
Assert.Equal(2999, RomanNumbers.RomanToInt("MMDCCCCLXXXXVIIII"));
var random = new Random();
const int minLength = 2;
const int maxLength = 16;
string chars = "IVXLCDM";
for (var i = 0; i < 10000; i++)
{
var length = minLength + random.Next(maxLength - minLength + 1);
var buffer = new char[length];
for (var j = 0; j < buffer.Length; j++)
{
buffer[j] = chars[random.Next(chars.Length)];
}
var romanNumber = new string(buffer);
var isValid = Regex.IsMatch(romanNumber, @"^M*(|C(C{0,3}|D|M)|DC{0,4})(|X(X{0,3}|L|C)|LX{0,4})(|I(I{0,3}|V|X)|VI{0,4})$");
Assert.Equal(isValid, RomanNumbers.TryParseRoman(romanNumber, out var _));
}
Assert.Equal(4567, RomanNumbers.RomanToInt("mMmMdlxvIi"));
Assert.Throws <ArgumentNullException>(() => RomanNumbers.RomanToInt(null));
Assert.Throws <FormatException>(() => RomanNumbers.RomanToInt("XM"));
}
