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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 had the same issue. The wording implies that the output should be lowercase, not that the input can be mixed case. If I hadn't stumbled across VanSr's comment, I would not have completed this one.
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it seems so, failure in the test cases.
the solution should not have passed.
The tests weren't functional, so anything passed.
I used this solution just to see what I could learn, and was surprised to see it work.
Wouldn't a value of 4 for size give an answer of 10101010? Where 1010 would be expected.
Sounds like you should read closely and consider why Test 4 passed when you changed it and what it shares in common with the next failing test.