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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'm experiencing the same problem. Even worse, my tests don't seem to run unless the code is free of warnings. Which makes the Kata unusable, unless there is a way to disable warnings?