Advantages and Disadvantages of Black-box testing

Earlier we saw what black box testing is and various techniques used by software professionals to test application under black-box testing. As you have seen under this method we are trying to check the functionality of the software and try to ascertain whether it meets the requirements of the customer or not without going into the coding part of it.
Black box testing comes with its own set of pros and cons which should be kept in mind to ensure that the software under testing is thoroughly tested before the actual roll-out takes place.

Advantages of Black Box testing

1)   It is efficient when used for large applications.
2)   As development and testing procedures are independent to each other, testing procedures can unprejudiced.
3)   Any non- technical resource can test the application or code using black box testing techniques, but he should be well equipped with testing techniques.
4)   There is no need for the testers to know the actual coding language or implementation details of the whole application.
5)   Test cases can be designed as soon as the functional specifications are ready. Testers do not have to wait for the development to be completed.
6)   Testing is done from the user’s point of view and not from the developer’s point of view.
7)   Test cases formation is faster as the testers don’t have to create test cases from internal functionalities of the application but from the GUI pages.
8)   Test cases which are created in black-box testing can be replicated for testing similar functionalities in other applications. This also translates in cost and effort saving in further projects.
9)   End-users usually do black box testing while performing acceptance testing or beta testing, thus black box testing is a major criteria which enables project success.

Disadvantages of Black Box testing

1)   It is not possible to test all the functionalities of the application with the help of black box testing.
2)   The reason of the failure of the test cases is unknown sometimes. This increases the debugging time.
3)   Test cases are designed but many of them are unclear and not precise.
4)   Many of the program paths remain untested.
5)   It is a challenging task to design the test cases without proper knowledge of the internal structure of the application.
6)   There are chances that many of the test cases are repetitive.
7)   The results of the test cases are often overestimated.

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