public void ConvertFromIntToRomanNumeral_IntsAreOutOfRange_Throws(int invalidNumber)
        {
            RomanNumeralsConverter conv = new RomanNumeralsConverter();

            var ex = Assert.Throws <ArgumentException>(() => conv.ConvertFromIntToRomanNumeral(invalidNumber));

            StringAssert.Contains("This isn't roman numeral", ex.Message);
        }
        public void ConvertFromIntToRomanNumeral_ValidInts_ReturnsRomanNumeral(int number, string expected)
        {
            RomanNumeralsConverter conv = new RomanNumeralsConverter();

            string result = conv.ConvertFromIntToRomanNumeral(number);

            Assert.AreEqual(expected, result);
        }