I'm sorry - I know that's cruel :(

Fixed.

Your second comment just describes real world cheating - I do not know anyone who does that :P
Besides there is possibility that when you are stacking bars in layers like that, you won't be able to break them without puting extra 'inhuman' strenght or breaking/damaging the 1x1 pice into smaller parts.

That's exactly it - function gets dimension of chocolate bar n x m and must return number of breaks needed to split it to blocks of 1x1 size

Ok i give up - changed some test cases to use assertEquals instead, so it should be a hint of some kind.

Thank you for giving it a try :)
I have updated description.

Thank you for input.
I have updated description - you should just return 0 in that case :).