Loading collection data...
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.
This does definitely not work for the hidden test cases. Nor does the instruction of testing match even the shown test cases. If you check for the values as instructed not even the visible test cases are working, let alone the hidden ones.