Bridge between Black Box and White Box – Gray Box Testing Technique

Software testing is a highly complex and time consuming activity- It is even difficult to say when testing is complete. The effective combination of black box (external) and white box (internal) testing is known as Gray-box testing. Gray box testing is a powerful idea if one knows something about how the product works on the inside; one can test it better, even from the outside. Gray box testing is not black box testing, because the tester does know some of the internal workings of the software under test. It is not to be confused with white box testing, testing approach that attempts to cover the internals of the product in detail. Gray box testing is a test strategy based partly on internals. This paper will present all the three methodology Black-box, White-box, Graybox and how this method has been applied to validate critical software systems.