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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.
I don't think the tests make the desired behavior, or what is failing, clear enough for the level of JS user that this kata would be useful for.
So? This isn't school. People are here to learn and get better. If they're writing their code as switch statements for particular tests, that's their loss. Real test-driven development involves being able to see the tests that you're writing code for.