Testing reveals the presence of bugs, never their absence. With hindsight you can always feel smugly superior in saying “you should have tested for this”, but t

Testing reveals the presence of bugs, never their absence. With hindsight you can always feel smugly superior in saying “you should have tested for this”, but there’s an infinitude of things you might need to test, and if you haven’t encountered a failure you didn’t test for, you’re probably just lucky.