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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 admit that it is slightly ambiguous, but to me "the test cases ensure" reads like you as the developer can assume that the test case input will always already be sanitized and you don't have to worry about data anomalies.