I understand that this is a kata for very beginners. Still I believe that you should put more simple mistakens in the code to be corrected, like removing a ";", mistyping some keywords or something else.

This kata is basically a duplicate to the entry test, Multiply.

Needs more tests.

I like that there is very little explanation and one must first run it to use the error as a way of finding the right answer...-However- as you'll see with my solution it also let's someone get a "correct" answer with a small, cheap "hack". Possibly missing the bigger point of the problem? At the very least add more test cases, but I think this is too simple as it is.

Just one test allows for incorrect code to pass. Yes, even for a kata named Very easy, that's no excuse for writing poor test suite.