Interesting article, but too many uncertainties: 100 examples only, the 30 code bases w/o unit tests might have tests the author didn't check or see, and there

Interesting article, but too many uncertainties: 100 examples only, the 30 code bases w/o unit tests might have tests the author didn't check or see, and there is likely a cluster effect in this sample to be found. But interesting enough to warrant a large scale investigation to see if those results would really hold.