diff --git a/tcr-roman-numerals/src/test/java/fr/ippon/kata/numeral/NumeralsTest.java b/tcr-roman-numerals/src/test/java/fr/ippon/kata/numeral/NumeralsTest.java
index 3858f66cceed2384b5d2cebffb6a5f6601f642de..8888977274735ff12075265b6bf05ce8f0ce16d3 100644
--- a/tcr-roman-numerals/src/test/java/fr/ippon/kata/numeral/NumeralsTest.java
+++ b/tcr-roman-numerals/src/test/java/fr/ippon/kata/numeral/NumeralsTest.java
@@ -45,4 +45,9 @@ class NumeralsTest {
   void shouldConvertTenToX() {
     assertThat(Numerals.toRoman(10)).isEqualTo("X");
   }
+
+  @Test
+  void shouldConvertElevenToXI() {
+    assertThat(Numerals.toRoman(11)).isEqualTo("XI");
+  }
 }