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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.
the error appears because no unit tests are written. If you write at least one yourself the error disappears and it compiles. Would be better if at least one test existed by default, tbh.