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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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232 existing solutions make it unlikely there suddenly is a bug.
It is possible you're returning a wrong datatype, triggering weird messages. That would not be a bug in the tests; it could be considered a bug in your ( incomplete ) solution. Tests do not always handle that gracefully.
Hi! Try checking your solution againsta a dataset with multiple visits starting, ending or one starting and another ending at the exact same timestamp.