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 mourning were specified in an unofficial dress code: "non-reflective black paramatta and crape for the first year of deepest mourning, followed by nine months of dullish black silk, heavily trimmed with crape, and then three months when crape was discarded. Paramatta was a fabric of combined silk and wool or cotton; crape was a harsh black silk fabric with a crimped appearance produced by heat. Widows were allowed to change into the colors of half-mourning, such as gray and lavender, black and white, for the final six months." A "black day" (or week or month) usually refers to tragic date.