diff --git a/challenges/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting.json b/challenges/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting.json
index c236344d3b..ac0833dae8 100644
--- a/challenges/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting.json
+++ b/challenges/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting.json
@@ -787,13 +787,21 @@
       ],
       "tests": [
         "assert(getIndexToIns([10, 20, 30, 40, 50], 35) === 3, 'message: <code>getIndexToIns([10, 20, 30, 40, 50], 35)</code> should return <code>3</code>.');",
+        "assert(typeof(getIndexToIns([10, 20, 30, 40, 50], 35)) === \"number\", 'message: <code>getIndexToIns([10, 20, 30, 40, 50], 35)</code> should return a number.');",
         "assert(getIndexToIns([10, 20, 30, 40, 50], 30) === 2, 'message: <code>getIndexToIns([10, 20, 30, 40, 50], 30)</code> should return <code>2</code>.');",
+        "assert(typeof(getIndexToIns([10, 20, 30, 40, 50], 30)) === \"number\", 'message: <code>getIndexToIns([10, 20, 30, 40, 50], 30)</code> should return a number.');",
         "assert(getIndexToIns([40, 60], 50) === 1, 'message: <code>getIndexToIns([40, 60], 50)</code> should return <code>1</code>.');",
+        "assert(typeof(getIndexToIns([40, 60], 50)) === \"number\", 'message: <code>getIndexToIns([40, 60], 50)</code> should return a number.');",
         "assert(getIndexToIns([3, 10, 5], 3) === 0, 'message: <code>getIndexToIns([3, 10, 5], 3)</code> should return <code>0</code>.');",
+        "assert(typeof(getIndexToIns([3, 10, 5], 3)) === \"number\", 'message: <code>getIndexToIns([3, 10, 5], 3)</code> should return a number.');",
         "assert(getIndexToIns([5, 3, 20, 3], 5) === 2, 'message: <code>getIndexToIns([5, 3, 20, 3], 5)</code> should return <code>2</code>.');",
+        "assert(typeof(getIndexToIns([5, 3, 20, 3], 5)) === \"number\", 'message: <code>getIndexToIns([5, 3, 20, 3], 5)</code> should return a number.');",
         "assert(getIndexToIns([2, 20, 10], 19) === 2, 'message: <code>getIndexToIns([2, 20, 10], 19)</code> should return <code>2</code>.');",
+        "assert(typeof(getIndexToIns([2, 20, 10], 19)) === \"number\", 'message: <code>getIndexToIns([2, 20, 10], 19)</code> should return a number.');",
         "assert(getIndexToIns([2, 5, 10], 15) === 3, 'message: <code>getIndexToIns([2, 5, 10], 15)</code> should return <code>3</code>.');",
-        "assert(getIndexToIns([], 1) === 0, 'message: <code>getIndexToIns([], 1)</code> should return <code>0</code>.');"
+        "assert(typeof(getIndexToIns([2, 5, 10], 15)) === \"number\", 'message: <code>getIndexToIns([2, 5, 10], 15)</code> should return a number.');",
+        "assert(getIndexToIns([], 1) === 0, 'message: <code>getIndexToIns([], 1)</code> should return <code>0</code>.');",
+        "assert(typeof(getIndexToIns([], 1)) === \"number\", 'message: <code>getIndexToIns([], 1)</code> should return a number.');"
       ],
       "type": "bonfire",
       "isRequired": true,
@@ -937,4 +945,4 @@
       }
     }
   ]
-}
\ No newline at end of file
+}