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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.
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As others have mentioned before, this really does not feel like a 5 kyu at all. In its current state, I'd rank it at 7 kyu.
I don't think I understand what you're getting at.
The random tests are present and they generate Assert.AreEqual() statements that are equivalent to the JS ones.
Perhaps you are referring to each of the random test cases not being listed individually in the test runner output?
What do you even mean by 'real' C# code? I'm new to codewars and more than happy to learn if the criticism is constructive, but this isn't a constructive or sufficiently informative comment.
Adding C# translation: https://www.codewars.com/kumite/5baa9d2e09fd2ae7b2000288?sel=5baa9d2e09fd2ae7b2000288 :)