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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
Problem may have been modifying inputs, in which case you deserve whatever you get.
Closing.
The test cases did not expect for any nil, so it was probably in the solver code the part that added them; that said, I changed the tests again according to Insti suggestion to make them even more reliable.
The Ruby/Python translator will be able to assist when he comes online again.