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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.
Because encode function is only tested by user's own decode function this can be done, hence the tests are a failure.
Returning
Invalidis a poor design choice since adfly encoded string ofInvalidwill also be decoded asInvalid.Noneshould be returned in this case.Needs random tests.