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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 test case faild at input:'' ? how to check this ? -- I got this same error.
I think this may be a bug. I did some testing in console and was not able to reproduce. I wish we had the option to view test cases after passing X% of tests or something. Not having more descriptive messages is very frustrating and makes users feel confused as to whether they made a mistake or the platform is acting wonky.