Testing, Testing

From now on, most challenges will have tests: code I wrote to check the code you wrote.

In challenges that have tests, the ✓ button will run the tests rather than send you straight to the next challenge. Give it a try.

Whoops. The tests were expecting a variable that you haven't defined yet. That's why you see the message "Expected an assignment named favoriteNumber" where you usually see the output of your code.

Let's fix that, but let's intentionally make a mistake. Add this line:

let favoriteNumber = true;

Click the ✓ button to run the tests again. One passed, the other failed. The message gives you a hint. In this case, the test checked that favoriteNumber names a numerical value. Now that you know that, update your code and run the tests once more.

As long as you assigned a number to the variable favoriteNumber, both tests should have passed. You'll see a new button show up: ». Click it to move on to the next challenge.