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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'm using Python, and the test cases which are giving the wrong output in the automatic tests are giving the right output in my IDE. For example, it says "'12' should equal '2'". Clearly, 2-1 = 1, so the test string here is '1'. But when I run increment_string('1') on my computer, it correctly returns '2'. All 11 inputs which are giving the wrong input in the automatic tests are giving me the right output when I run them myself. This leads me to think there is something wrong with the automatic tests.