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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.
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Using entirely random data in the tests can lead to some unexpected results. Also, it makes it hard to diagnose the root cause of the failure. Tests should be deterministic in order to be repeatable and should also help the developer diagnose the error quickly.