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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.
yes. The above comment.
Your IDE does not have the random code generator the testing suite here has. Each time you run your code, you pass some of the tests, then the testing halts. This is why you see a different number of passed tests. Typically, kata have 100 random tests. EDIT: this one has 200 random tests (in Python).