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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 second @WangHW 's suggestion.
Would be helpful if there was more than one test.
It's confusing that run tests shows all tests passed, then submit shows test failed.
Maybe a test case can be added to test "float that is integer", such as:
test.assert_equals(f(15.0), 120)