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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.
That's more or less a bad test case/message by the author. Showing the actual test isn't feasible, since this could reveal the solution or too much information.
Linking to my github account did the trick for me.
Is there a way to see failing test cases during submission? Often I see some test failed and I don't really know what the test actually is. Sometimes I can figure it out based on the message returned by test cases, but often I cannot.