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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.
You need to read the description really closely. It says it should return the string "with all even indexed characters in each word upper cased". So there is nothing wrong with the tests =).
But maybe this should be pointed out more clearly in the description, seeing as a lot of people (me included) seem to have stumbled over it.
One of the tests required that 'ThIsIsATeSt' should equal 'ThIs Is A TeSt'. Is there something wrong with the tests?