Read this: One advantage of the black box technique is that no programming knowledge is required. Whatever biases the programmers may have had, the tester likely has a different set and may emphasize different areas of functionality. On the other hand, black-box testing has been said to be "like a walk in a dark labyrinth without a flashlight." Because they do not examine the source code, there are situations when a tester writes many test cases to check something that could have been tested by only one test case, or leaves some parts of the program untested.
Now answer this question, if there is an answer (If it cannot be answered, return "unanswerable"): What can black-box testing sometimes be referred to with the in-ability to see the code?
like a walk in a dark labyrinth without a flashlight.