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I have the deepest respect for you and your writings, but exactly how much maximum code coverage have you achieved and sustained for at least a month using automated unit tests ?

Just wondering how long you've visited the region you're writing a travel review about.

Unit tests are about confidence in the software. Automation is the mechanism for sustained confidence. Engineering (and / or fad as you put it) is a vehicle to get there.

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You can have 100% code coverage, and still not be testing anything. Unless you're testing thoroughly the right parts, they're a false sense of security.

I agree with that. Its just an (imperfect) proxy measure of the depth / extent of unit testing. Asking how much code coverage is likely to give a better reflection of the effort behind unit testing rather than just a - "have you done unit testing".

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