[jungler]

Although many folks have raised the "not Gettier" objection, I would propose that the premise of applying the test to debugging is wrong. Debugging means that your assumptions were already faulty: otherwise the system would not have bugs.

That is, the act of programming means working on an unfinished thought, something that can reflect some beliefs but compromises on being an exactly true expression of them. And so the weight of philosophical reasoning should appear at design time. What occurs after that is a discovery phase in which you learn all the ways in which your reasoning was fallacious - both bugs and feature decisions.