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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 didn't spot that issue, thank you for pointing that out. Go with the version that's included in the implementation. ie the first example you gave.
I've now updated the description.
Should test(a, b) be transformed to [ 'test', ['a', ',', 'b'] ] or [ 'test', ['a', 'b'] ]? I saw there's ambiguity between train dataset and instruction...