Adding More Methods

• Now you decide to add another feature: characters can cast spells on one another. The details of spells aren’t important for studying extensibility, so for now we will add a spellCast method to each character that returns the same character for everyone other than Frogs; for Frogs, the spellCast method should invoke the frog’s kiss method.

• Write test cases to confirm that you can cast spells and that the characters resulting from spells retain all their original behavior.

• Articulate how you decided what to test on the last question. Did you test that a prince who results from kissing a frog can have spells cast upon him? If not, extend your description of what tests to run and add a test case for this.

• Explain the results of the casting-spell-on-kissed-frog test. Be precise: what caused the problem?

Release software (ie, add a new dashed line). Proceed to part 4.