Information from Best Software Testing Companies: White Box, Black Box and Grey Box Testing Methods
Information from Best Software Testing Companies: White Box, Black Box and Grey Box Testing Methods
Software testing can be classified by access to a program’s source code and application architecture.
White box technique or open box testing, clear box testing or glass box testing is aimed at verifying the internal structure and the application ID; white box testers acquire the knowledge on how the application works and how it is implemented. There is also a design based technique that is included in white box testing.
Advantage: allows to identify hidden problems and simplifies their removal. It is useful when when GUI is experiencing frequent changes.
Disadvantage: Only highly skilled testers can carry out the process because high complexity test cases are developed for this technique. Used in addition to black box testing.
Employing this technique best software testing companies manage to improve stability & reusability of test cases given that the object of a program does not change.
Sometimes, this method is considered as a part of static testing, but the tester can start to execute the code and at that periodically refer to the code (but module testing is the phase during which code is executed and meanwhile it verifies the code itself but not the entire application.
Black box technique or closed box testing, specification based testing is run to test functionality of a software product without any knowledge of its internal workings. This technique treats an application as a “black box” with outputs and inputs. Specifically, the tester does not know how software works, he is only aware of what it is expected to do. Running black box testing, a tester impacts the application and examines its response in a manner resembling the possible behavior of the real users. Under black box testing documentation is the main information source to be used to create test cases.
This technique is sometimes called as requirements-based testing when requirements are unclear, but this has no fixed definition.
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Grey box testing combines both white box and black box testing methods. The tester has access only to some piece of code and app architecture.
However, some authors define the technique as a contradiction to these methods, emphasizing that when grey box testing is run the internal workings of a program is partially known and it is possible to understand how it is implemented during testing process.
By the way, qa outsourcing is an independent process meant to ensure quality of your project when you lack infrastructure, resources or time so that to bypass one of its important development stages.
