diff --git a/test.js b/test.js
index cef9a03..bda7a8f 100644
--- a/test.js
+++ b/test.js
@@ -4,5 +4,6 @@ const assert = require("assert");
 
 assert.strictEqual(add(1, 2), 3);
 assert.strictEqual(subtract(5, 3), 2);
+assert.strictEqual(add(2, 2), 5); // intentionally wrong to fail CI
 
 console.log("All tests passed!");