Testing is an extremely important phase in software development. The use of computers is not limited to the desk only they have moved into everything we use. Almost all the devices we use have computer software thus making testing even more necessary. Software testing ensures that a program is run the way it was supposed to run in the first place, that is without any errors. It undertakes to enhance the quality and reliability of a program. Two types of testing are the most commonly used testing services . They are the black-box testing technique and the white-box testing technique.