Grey box testing is the combination of black box
and white box testing. Intention of this testing is to find out defects
related to bad design or bad implementation of the system. In gray
box testing, test engineer is equipped with the knowledge of system and
designs test cases or test data based on system knowledge. For
example, consider a hypothetical case wherein you have to test a web
application. Functionality of this web application is very simple, you
just need to enter your personal details like email and field of
interest on the web form and submit this form. Server will get this
details, and based on the field of interest pick some articles and mail
it to the given email. Email validation is happening at the client side
using Java Scripts.
In this case, in the absence of implementation detail, you
might test web form with valid/invalid mail IDs and different field of
interests to make sure that functionality is intact.
But, if you know the implementation detail, you know that system is making following assumptions
- Server will never get invalid mail ID
- Server will never send mail to invalid ID
- Server will never receive failure notification for this mail.
So
as part of gray box testing, in the above example you will have a test
case on clients where Java Scripts are disabled. It could happen due to
any reason and if it happens, validation can not happen at the client
site. In this case, assumptions made by the system are violated and
- Server will get invalid mail ID
- Server will send mail to invalid mail ID
- Server will receive failure notification
Hope you understood the concept of gray box testing and how it can be
used to create different test cases or data points based on the
implementation details of the system.
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