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It's a great point that, if there's some behavior worth capturing in a comment, you may also want to capture it in a unit test.

But why should you strive for the "ability to eliminate" comments? What is the advantage of having fewer comments?

I subscribe to the minimalism approach. i.e. I do my best to improve the signal to noise ratio (which is inline with the authors goal).

Also, in many cases, having a both the unit test and the comment is a redundancy.