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I can't find many, if any, unit tests. Is that intended? If so, why?

Every single function has a test from what i can tell. Which are missing?

Could be possible they looked at the sort directory and overlooked the combination test file "sorts_test"?

More likely he accidentally left out a word.

"I can't find many, if any, [without] unit tests. Is that intended? If so, why?"

Then you're not very competent. For every folder there is a file called test. Who would have guessed?