Code coverage and automated testing tools existed and were mature when I started at my now defunct employer 20 years ago. In The Soul of a New Machine [0] (pub

Code coverage and automated testing tools existed and were mature when I started at my now defunct employer 20 years ago. In The Soul of a New Machine [0] (published 40 years ago) such tools were used and the author wrote about them without any indication that they were new or novel. Every new generation of developers thinks that the "old days" were primitive, but that's just not true. [0] https://en.wikipedia.org/wiki/The_Soul_of_a_New_Machine https://en.wikipedia.org/wiki/The_Soul_of_a_New_Machine