diff --git a/adder/src/lib.rs b/adder/src/lib.rs
index 5014a76..336ea08 100644
--- a/adder/src/lib.rs
+++ b/adder/src/lib.rs
@@ -11,4 +11,9 @@ mod tests {
         let result = add(2, 2);
         assert_eq!(result, 4);
     }
+
+    #[test]
+    fn another() {
+        panic!("Make this test fail");
+    }
 }