Software Testing Methods
There are different methods which can be use for Software testing. This chapter briefly describes those methods.
Black Box Testing
The technique of testing without having any knowledge of the interior workings of the application is Black Box testing. The tester is oblivious to the system architecture and does not have access to the source code. Typically, when performing a black box test, a tester will interact with the system's user interface by providing inputs and examining outputs without knowing how and where the inputs are worked upon.
White Box Testing
White box testing is the detailed investigation of internal logic and structure of the code. White box testing is also called glass testing or open box testing. In order to perform white box testing on an application, the tester needs to possess knowledge of the internal working of the code.
The tester needs to have a look inside the source code and find out which unit/chunk of the code is behaving inappropriately.
Grey Box Testing
Grey Box testing is a technique to test the application with limited knowledge of the internal workings of an application. In software testing, the term the more you know the better carries a lot of weight when testing an application.
Mastering the domain of a system always gives the tester an edge over someone with limited domain knowledge. Unlike black box testing, where the tester only tests the application's user interface, in grey box testing, the tester has access to design documents and the database. Having this knowledge, the tester is able to better prepare test data and test scenarios when making the test plan.
Black Box vs Grey Box vs White Box
|S.N.||Black Box Testing||Grey Box Testing||White Box Testing|
|1||The Internal Workings of an application are not required to be known||Somewhat knowledge of the internal workings are known||Tester has full knowledge of the Internal workings of the application|
|2||Also known as closed box testing, data driven testing and functional testing||Another term for grey box testing is translucent testing as the tester has limited knowledge of the insides of the application||Also known as clear box testing, structural testing or code based testing|
|3||Performed by end users and also by testers and developers||Performed by end users and also by testers and developers||Normally done by testers and developers|
|4||Testing is based on external expectations - Internal behavior of the application is unknown||Testing is done on the basis of high level database diagrams and data flow diagrams||Internal workings are fully known and the tester can design test data accordingly|
|5||This is the least time consuming and exhaustive||Partly time consuming and exhaustive||The most exhaustive and time consuming type of testing|
|6||Not suited to algorithm testing||Not suited to algorithm testing||Suited for algorithm testing|
|7||This can only be done by trial and error method||Data domains and Internal boundaries can be tested, if known||Data domains and Internal boundaries can be better tested|