ANONYMOUS wrote: The marking rubric awards marks for passing the tests and for code style. Edge cases that are not tested for should not affect your correctness mark (unless we have reason to believe you are circumventing the tests), but may affect your style mark, as marks are awarded for logical and elegant solutions, and not handling a plausible input may undermine the logic of your code. I will however say that the example you give of an empty page is not so much an edge case as it would be a violation of the API. You do not need to handle cases that by specification should not exist, as that is just a waste of time and makes your code more confusing.