public void RomanToInt()
    {
        var converter = new RomanNumeralStringToAlgo();

        Assert.Equal(10,
                     converter.RomanToInt("X"));

        Assert.Equal(58,
                     converter.RomanToInt("LVIII"));

        Assert.Equal(4,
                     converter.RomanToInt("IV"));
    }
        public void Validate(int num, string roman)
        {
            var sol = new RomanNumeralStringToAlgo();

            Assert.Equal(roman, sol.IntToRoman(num));
        }