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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.
Just fixed the tests and blocked such solutions.
Haha, nice. Just like real software, if the bug is there for long enough it becomes part of the spec (talking about the bug in the test suite).
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If you make your own assertion for "-123" on a working solution, it returns True, even though, by the kata's wording, that should return False.
Please explain yourself better. Which language? What do you mean it works?
"-123" works even though it shouldn't.