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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.
Should be fixed now.
Yeah, test suite needs rework, but the issue you raised at first had nothing to do with it.
What do you mean? AFAIK it works, error messages (which you should carefully read) most likely come from your code giving invalid results.