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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.
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As of now (August 2019) you have to register an account on their website to be able to send API requests, and the tests expect you to return a json response with an error message stating that the request is incorrect.
Note: I've removed the case which actually disallowed passing the tests, but the kata is beyond repair.
The function name should be in snake_case.
A kata about calling third party APIs are not very good material because it depends on that website being available in the near future, which might or might not happen.
Needs random tests
Expected and actual argument in the tests are flipped.