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Advantages & Disadvantages

Advantages of Black Box Testing
  • More effective on larger units of code than glass box testing
  • Tester needs no knowledge of implementation, including specific programming language
  • Tester and programmer are independent of each other
  • tests are done from a user’s point of view
  • will help to expose any ambiguities or inconsistencies in the specifications
  • test cases can be designed as soon as the specifications are complete
Disadvantages of Black Box Testing
  • Only a small number of possible inputs can actually be tested, to test every possible input stream would take nearly forever
  • Without clear and concise specifications, test cases are hard to design
  • There may be unnecessary repetition of test inputs if the tester is not informed of test cases the programmer has already tried
  • May leave many program paths untested
  • Can’t be directed toward specific segments of code which may be very complex (and therefore more error prone)
  • Most testing related research has been directed toward glass box testing

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