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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.
It depends on the input string, doesn't it?
No, I've copied those tests from Java test suite, if you see other thing in sample tests, click reset. These should be the sample tests:
You're confusing the input of one test with the expected value of another.
Those are the assertions and you can see they're both ok.
The tests are ok. This case is even explained in the kata description.