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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.
Like what? Please provide examples. Btw, all Ruby tests are fine. If you meant the sample tests, that was a mockup for you to write your own, added some sample tests related to the task.