I removed the random tests because they don't conform to the story.

I have the same issue (JavaScript)

You are evidentely modifying the array in place, which is bad practice unless required.

Also, I see no part of the description forbidding the use of negatives, but I can quickly fix that (and it has nothing to do with the problem).

This kata is not supposed to be passing negative values. Let me look into this.

Yeah, that's also happening to me. It says: "It should work for random inputs too: -1336 should equal -567", but the list is: [169, -527, -40, 157, 33, -809, 173] so my answer should be right