fix(curriculum): add test for clarifying output formatting in lab voting system (#65017)

curriculum/challenges/english/blocks/lab-voting-system/673b567e3ba535dda140d278.md

@@ -276,6 +276,32 @@ try {
 }
 ```
 
+When option `Turkey` gets two votes, option `Morocco` gets one vote, and option `Spain` doesn't get any vote, `displayResults()` should return `"Poll Results:\nTurkey: 2 votes\nMorocco: 1 votes\nSpain: 0 votes"`.
+
+```js
+const pollCopy = new Map(poll);
+try {
+  poll.clear();
+  addOption('Turkey');
+  addOption('Morocco');
+  addOption('Spain');
+
+  vote('Turkey', 'traveler1');
+  vote('Turkey', 'traveler2');
+  vote('Morocco', 'traveler3');
+
+  assert.equal(
+    displayResults(),
+    'Poll Results:\nTurkey: 2 votes\nMorocco: 1 votes\nSpain: 0 votes'
+  );
+} finally {
+  poll.clear();
+  pollCopy.forEach((val, key) => {
+    poll.set(key, val);
+  });
+}
+```
+
 `displayResults()` should return the results in the correct format.
 
 ```js