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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.
Had the same issue. Had to wrap it in a try/except block specifically for the random tests to strip off the first "datetime". I have no idea why the random tests are doing that, but this seems like it's an issue with the way the tests are written.