Your initial game is successful, so you decide to add a kiss method to each class. Princes, Princesses, and Witches don’t change when kissed, but Frogs turn into Princes (with the same name).
Remember, don’t edit your existing Character classes. You can subclass them, but that’s it.
Write test cases to confirm that each character type responds properly to being kissed.
Release software (ie, add a new dashed line). Proceed to part 3.