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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.
There is a test case which is trying to sum empty strings like 'test.assert_equals(sum_strings("", ""), "0")', this contradicts with the description of the kata
'Given the string representations of two integers ...'
'A string representation of an integer will contain no characters besides the ten numerals "0" to "9".'
Empty string is not a string representation of an integer.