Introduction to White Box Testing, Black Box Testing.

Black Box Testing is based on requirements and specifications. Black box testing requires no knowledge of internal code, structures, or implementation of the software product being tested.

White Box Testing is based on internal code, internal structures, and implementation of the software product being tested. White box testing generally requires detailed programming skills.

The below mentioned figure shows how both types of testers view an accounting application. How black box testers view the application. While during white box testing the tester knows the internal structure of the application. In most scenarios white box testing is done by developers as they know the internals code, structures of the application. In black box testing we check the overall functionality of the application while in white box testing we do code reviews, view the architecture, remove bad code, and
do unit level testing.

White Box Testing, Black Box Testing and Gray Box Testing