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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.
Sure. The tests that expect a wrong result are:
Test.assert_equals(gap(6,100,110), None)
Test.assert_equals(gap(10,300,400), [337, 347]).
I don't see why this could be a language problem.
Basic tests haven't been fixed yet despite people pointing it out since at least few months. And probably I'd check hidden tests as well.
Very clever, just one line :D