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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.
It's a problem with your code, print the input with:
Console.WriteLine("[{0}]", string.Join(", ", intervals));
The expected value for ShouldHandleRandomIntervals, the only test I could see the input there is also ok.
Where is your proof that there is an issue? Show us the input, expected value and your function's output at least.