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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.
I've invited a friend of mine to the site using a referral link. He has already registered and confirmed his email (proof: https://pp.vk.me/c618129/v618129939/627d/lNH4cnWiQqU.jpg), but I still see him as an unconfirmed at my account page (proof: http://i.imgur.com/CJDat72.jpg). No extra honor was given aswell.
Lots of katas (e.g. this one: http://www.codewars.com/kata/52996b5c99fdcb5f20000004/train/ruby) have a note about default test cases uploaded with them at the "Your test cases" section of the site screen, but it seems like I'm not able to see even a single one. The input field is just pre-populated with commented manual about testing methods.
Here is a screenshot of explained behaviour: http://i.imgur.com/2MFR6Uf.jpg
Tested with Chrome 34.0.1847.131 m, Firefox 29.0.