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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.
Expected update of "last" value, that's why waiting test doesn't work properly.
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Returning errors should probably be tested too.
https://www.codewars.com/kata/reviews/5a8cf0cc6e3b30d630000575/groups/5a8d37e46c083ceede00066c
Asynchronous things should be tested with a timeout in
describe:https://www.codewars.com/kumite/59f4abb427402f96e8000051?sel=59f9e16ac374cbf19a00007e
Needs random tests.
https://www.codewars.com/kata/reviews/5a8cf0cc6e3b30d630000575/groups/5a8d03236e3b307cbf0013f6