Convert five

tcr-roman-numerals/src/main/java/fr/ippon/kata/numeral/Numerals.java

@@ -3,6 +3,14 @@ package fr.ippon.kata.numeral;
 public class Numerals {
 
   public static String toRoman(int arabic) {
+    if (arabic == 5) {
+      return "V";
+    }
+
+    if (arabic == 4) {
+      return "IV";
+    }
+
     return "I".repeat(arabic);
   }
 }

tcr-roman-numerals/src/test/java/fr/ippon/kata/numeral/NumeralsTest.java

@@ -20,4 +20,14 @@ class NumeralsTest {
   void shouldConvertTwoToII() {
     assertThat(Numerals.toRoman(2)).isEqualTo("II");
   }
+
+  @Test
+  void shouldConvertFourToIV() {
+    assertThat(Numerals.toRoman(4)).isEqualTo("IV");
+  }
+
+  @Test
+  void shouldConvertFiveToV() {
+    assertThat(Numerals.toRoman(5)).isEqualTo("V");
+  }
 }