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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.
There're only 12 valid inputs for which the answers can be easily hard-coded, so the challenge is as good as "compare the inputs to some fixed values", and that's not new at all.
Input validation is more annoying than anything and should be dropped.
Test.assert_equalsshould be used instead.