diff --git a/tests/3_lis/test.js b/tests/3_lis/test.js
index 45fdb90..878a560 100644
--- a/tests/3_lis/test.js
+++ b/tests/3_lis/test.js
@@ -12,5 +12,6 @@ export default {
     const nums = [10, 9, 2, 5, 3, 7, 101, 18, 4, 6];
     const length = await findLISLength(nums);
     assert.strictEqual(length, 4, "Test Failed: LIS length should be 4.");
+    return length;
   }
 };