Roman Numeral TDD Kata on the SSaurel's Channel

RomanNumeral.java

public String intToRoman(int arabic) {
   StringBuilder roman = new StringBuilder();

   if (arabic == 10) {
      roman.append("X");
   } else if (arabic == 20) {
      roman.append("XX");
   } else {
      while (arabic-- > 0) {
         roman.append("I");
      }
   }

   return roman.toString();
}