White-box testing The real point is that tests are usually designed from an abstract structure such as the input space, a graph, or logical predicates, and the question is what level of abstraction we derive that abstract structure from. That can be the source code, requirements, input space descriptions, or one of dozens of types of design models. Therefore, the "white-box / black-box" distinction is less important and the terms are less relevant. In penetration testing, white-box testing refers to a methodology where a white hat hacker has full knowledge of the system being attacked. The goal of a white-box penetration test
Black or White the US, selling over one million copies and became the second best selling single of the year. As of August 2018 the song further certified two time platinum for the digital sales. Reviews of the song were generally favorable. David Browne praised: "He still knows how to fashion a hook that will take up permanent residence in your brain (away from its video, "Black or White" is spare and effortless)" "Rolling Stone"s Allan Light in his "Dangerous" review, compares the song unfavourably to "Beat It": "Neither this slow-burn solo nor the Stones-derived riff on 'Black or White' offers the catharsis