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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.
Very nice Kata, good description and environment, but the tests are not enough.
There should be test which states that "x - y - z + 1" and "x - y - ( z + 1 )" must have different solutions.
ATM (Java)-solutions are accepted which give for both expression the same result.