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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.
Also there were some janky moments + no random tests as well, only plug for it. I've tried to retranslate it properly, please watch the latest comments~
For PHP I believe both in sample tests and while attempting solving the Kata assertEquals() have their parameters swapped. In PHPUnit first parameter is the expected result and the second one the actual result, not the other way.