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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.
I assume you have solved it by now? The solution I can see from you passes and also is in an accepted solution group by 79 other people.
The Codewars test suite will usually have tests your VSCode setup does not include. While you may be able to use any amount of these known fixed tests in your own environment, keep in mind you still have to pass the random tests on Codewars as well.