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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.
Probably that your code is wrong.
How do you know that it produced the expected result?
What's the input for the test you failed?
What was your answer?
What was the expected answer?
Or, do you not know? If that's the case, then you shouldn't be saying that you know that it returns the expected result.