How Effectively Is Defective Code Actually Tested?
Jean Petrić, Tracy Hall, David Bowes · 2018
Background: Newspaper headlines still regularly report latent software defects. Such defects have often evaded testing for many years. It remains difficult to identify how well a system has been tested. It also remains difficult to assess how successful at finding defects particular tests are. Coverage and mutation testing are frequently used to asses test effectiveness. We look more deeply at the performance of commonly used JUnit testing by assessing how much JUnit testing was done and how effective that testing was at detecting defects in seven open source systems.