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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 think it might be worth having a basic test where you have a string that is reversed instead of only rotating strings. e.g. the first test of the submission tests.
I think it would be worthwhile adding a test to see if code works for negative values for number.
e.g. Test.assert_equals(solution(-10), -23)