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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.
Probably so that there would be an explicit test failure message instead of failed tests after which someone would post an issue as it usually happens in this case.
Why does that need to be checked?