A software testing technique whereby explicit knowledge of the internal workings of the item being tested are used to select the test data. Unlike black box testing, white box testing uses specific knowledge of programming code to examine outputs. The test is accurate only if the tester knows what the program is supposed to do. He or she can then see if the program diverges from its intended goal.

Black box testing maps a set of specific inputs to a set of expec

- similarity and difference of output values

- similarity and difference of expected processing

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