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.
I have the same error.. 998 passed/2 failed. Is it a sort of edge cases?:)
Now I found my mistake. Task is fine.
I'm using test.expect_error, and it doesn't look like you raising an error.