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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 issue is this: A user can bypass the fixed tests manually, and then for the random tests, just return the input. You need to actually check the result of the encoding/decoding for random tests, not just encode then decode--because you're not actually forcing them to do it.