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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.
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He's right, something is wrong with the test cases, because it is indeed "1.2.3.4".. that's what I was talking about in my previous comment.. twice in a row it says that "1.2.3.4" is valid, then the 3rd time it says it's not valid..
This test is broken on one of the test cases.. after debugging, it appears that you test twice for "1.2.3.4" and expect a 'true' result, but later on you test a third time for "1.2.3.4" but this time you expect a 'false' result, thus making it inconsistent & impossible, because you cannot have both "true" and "false" results for the same IP of "1.2.3.4"..