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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.
There's nothing wrong with the test case, apparently your solution failed on
1234\nand098765\n. The\nis not visible in the error message (since it's new-line character). I think that's why you assumed it's1234and098765when it's not.