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See Also
Best Practices for Software Projects - Risk Management.
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Best Practices for Software Projects - Estimating. More...
Minimizing Software Defects via Inspections.
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Testing GUI. More...
Best Practices for Software Projects
- Software Measurements. More...
Test Reviews. More...
Key QA Documents. More...
Improving the Quality process by
doing the
Metrics Calculation
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| What is Gray Box Testing |
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Question:
What is Gray Box Testing? Where & how Gray Testing is used?
Posted by ashu_akl
Answer:
Let's begin with the most basic forms of testing: white box, or glass box
versus black box testing: I will quote from Testing Computer Software:
Second Edition (1993) Cem Kaner, Jack Falk, Hung Quoc Nguyen.
Glass box testing is distinguished from black box testing, in which the program is treated as a black box. You
can't see into it. The tester (or programmer) feeds it input data, observes output data, but does not know, or
pretends not to know, how the program works. The test designer looks for interesting input data and conditions
that might lead to interesting outputs. Input data are "interesting" representatives of a class of possible
inputs if they are the ones most likely to expose an error in the program.
In contrast, in glass box testing, the programmer uses her understanding and access to the source code to develop
test cases.
At this point, on page 41of Testing Computer Software, they go into explaining the benefits of white box testing.
They also spend the next few pages going over the concepts of white box testing.
In recent years I have also heard of gray box testing. In this form of testing, the tester has access to some of
the inner workings of the system, usually the database, but not the code.
White box testers have access to the code, but even a black box tester canknow the branches of code--the rules
within the code that cause operations to fork. A white box tester generally uses the code, and the ability to create
drivers and stubs to test the code directly. They do not rely on the UI to do it.
The typical gray box tester is permitted to set up his testing environment,
like seeding a database, and can view the state of the product after their
actions, like performing a SQL query on the database to be certain of the
values of columns. It is used almost exclusively of client-server testers or
others who use a database as a repository of information, but can also apply to a tester who has to manipulate
XML files (DTD or an actual XML file) orconfiguration files directly.
The true black box tester looks only at the GUI and can not touch intermediate files, registry entries, databases,
etc., nor are they permitted to see the results their actions have wrought, other than through the UI. They are,
therefore, only permitted to use the UI to do their testing.
Posted by Walter Görlitz
 Share your thoughts on What is Gray Box Testing in SQAtester Group.
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| Books to Read |
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Testing Computer Software, 2nd Edition
The original printing of Testing Computer Software set the standard for the emerging field of test engineering
with a full tour of the state of the art in managing the testing process. The reissued text makes this classic
out-of-print text available once again. Though it relies heavily on older. More...
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Automated Software Testing
Written for those with some background in software engineering, Automated Software Testing: Introduction, Management,
and Performance delivers a rigorous guide to the state of the art in managing automated testing in a text that
will benefit anyone who tests software for a living. More...
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