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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.
Exactly. It shouldn't pass. But it is allowed in some solutions I'm seeing. That would help people to achieve the right solution.
An additional test case shouldbe added: Assert.IsFalse(IdentifierChecker.IsValid("a.b"), "IsValid("a.b") should returns false");
Several people are using the dot sign incorrectly.