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| What is "White Box" Testing? |
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shared by Mikhail Rakhunov
White box testing is usually contrasted with black box testing, which is testing only via established, public interfaces
such as the UI or the published API. Glass box and transparent box are synonyms for white box.
The simple answer is white box testing is testing that is done with knowledge of the internals of the product.
This boils down to several activities. Code coverage, mutation testing, unit and/or component testing, fault insertion,
etc.
Code coverage is a way of measuring your tests. You determine which lines/branches/procedures
have been executed during your test runs and continue developing tests until you hit some target percentage.
Mutation testing is another way of measuring your tests. You insert a bug
on purpose into the product and run your tests. At least one (preferably exactly one) test should fail.
Component or unit testing involves removing a block of code from the product, writing
a driver to sit over it and stubs to sit under it and testing the code standalone.
Fault Insertion involves forcing return codes to indicate errors and seeing what
happens. This is a good way to simulate certain events, such as disk full, out of memory, etc.
I think of glass box testing as part of the programming process because so many programmers routinely ran white
(glass) box tests of their modules just before and just after integrating them with other parts of the system
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