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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.
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I'm facing the same issue. This assertion has some trouble on codewars, but it passes on my machine with node v6.10.3 and chai v3.5.0.
I have also translated the tests to run them with should (v11.1.2) instead of chai, and again, everything is ok.
Maybe a problem with an old chai version?