Gray box Testing is a software testing technique thst uses a combination of black box testing & white box testing.Gray box testing is not black box testing,because the

tester does know some of the internal workings of the software under test.In gray box testing,the tester testing,the tester applies a limited number of test cases to the

internal workings of the software under test.In the remaining part of the gray box testing,one takes a black box approach in applying inputs to the software under test and

observing the outputs.Gray box testing is a powerful idea.The concept is simple,if one knows something about how the product on the inside,one can test it better,even from

outside.Gray box testing is not to be confused with white box testing; i.e. a testing approach that attempts to cover the internals of the product in detail.Gray box testing is a
test strategy based partly on internals. The testing approach is known as gray box testing,when one does have some knowledge,but not the full knowledge of the internals
of the product one is testing.In gray box testing, just as in black box testing, you test from the outside of a product, just as you do with black box,but you make

better-informed testing choices because you're better informed;because you know how the underlying software components operate and interact.


Red box testing - User / Client can apply any techniques to accept the project. They will apply white box or grey box or black box for accepting the project. So we are

calling the user acceptance testing as a red box testing. Also networking, peripherals testing and protocol testing called red box testing.


Yellow box testing - It is a message level testing.
Simply yellow box testing is checking against the warning messages. Whether the system properly throwing the warning messages or not?