Loading collection data...
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.
Not a kata issue, please read the description.
Exactly. You are misinterpreting the error message. "Expected 2 to equal 0" means "I got a 2 but it should have been a 0", i.e. you produced the 2.
If you promise me a dog, but you give me a cat, I'd say "I expected the cat to be a dog".
Not an issue.