diff --git a/test/UnitTest/Class1.cs b/test/UnitTest/Class1.cs
index ff8d163..4e85ba9 100644
--- a/test/UnitTest/Class1.cs
+++ b/test/UnitTest/Class1.cs
@@ -12,11 +12,11 @@ public void PassingTest()
             Assert.Equal(4, Add(2, 2));
         }
 
-        // [Fact]
-        // public void FailingTest()
-        // {
-        //     Assert.Equal(5, Add(2, 2));
-        // }
+        [Fact]
+        public void FailingTest()
+        {
+            Assert.Equal(5, Add(2, 2));
+        }
 
         int Add(int x, int y)
         {