From 43865fc098e6dd9b418f5e3013375f762b76c18f Mon Sep 17 00:00:00 2001
From: Nicholas Carrigan <63889819+nhcarrigan@users.noreply.github.com>
Date: Sat, 6 Jun 2020 02:52:46 -0700
Subject: [PATCH] fix(learn): function must return boolean, not string.
 (#39010)

---
 ...check-for-the-presence-of-an-element-with-indexof.english.md | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/check-for-the-presence-of-an-element-with-indexof.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/check-for-the-presence-of-an-element-with-indexof.english.md
index 69a84ba1091..dc6110c0d9e 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/check-for-the-presence-of-an-element-with-indexof.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/check-for-the-presence-of-an-element-with-indexof.english.md
@@ -31,6 +31,8 @@ fruits.indexOf('pears'); // returns 1, the first index at which the element exis
 
 ```yml
 tests:
+  - text: The <code>quickCheck</code> function should return a boolean (<code>true</code> or <code>false</code>), not a string (<code>"true"</code> or <code>"false"</code>)
+    testString: assert.isBoolean(quickCheck(['squash', 'onions', 'shallots'], 'mushrooms'));
   - text: <code>quickCheck(["squash", "onions", "shallots"], "mushrooms")</code> should return <code>false</code>
     testString: assert.strictEqual(quickCheck(['squash', 'onions', 'shallots'], 'mushrooms'), false);
   - text: <code>quickCheck(["onions", "squash", "shallots"], "onions")</code> should return <code>true</code>