2018-12-24 GCOV/LCOV
LCOV provides a very valuable starting point on how to improve test quality, especially when visualizing large amounts of code. LCOV provides a web-based view of source code to see what parts of the code has or has not been tested.
I have been using LCOV off and on for around 7 years and it has helped me identify many missing tests and even track down real broken code. A couple years ago, I freelanced an article after approved query for the Linux Journal. For some reason, after I submitted it, I never got paid (including no kill fee) after several attempts in communication. I published it here today. Enjoy: http://reedmedia.net/~reed/qa/lcov-2016/