Black
box Testing
A method of software testing that verifies the functionality of an application without having specific knowledge of the application's code/internal structure. Tests are based on requirements and functionality.
The technique of testing
without having any knowledge of the interior workings of the application is
Black Box testing. The tester is oblivious to the system architecture and does
not have access to the source code. Typically, when performing a black box
test, a tester will interact with the system's user interface by providing
inputs and examining outputs without knowing how and where the inputs are
worked upon.
It is performed by QA
teams.
Advantages
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Disadvantages
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1.) Well suited and efficient for
large code segments.
2.) Code Access not required.
3.) Clearly separates user's
perspective from the developer's perspective through visibly defined roles.
4.) Large numbers of moderately
skilled testers can test the application with no knowledge of implementation,
programming language or operating systems.
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1.) Limited Coverage since only a
selected number of test scenarios are actually performed.
2.) Inefficient testing, due to the
fact that the tester only has limited knowledge about an application.
3.) Blind Coverage, since the tester
cannot target specific code segments or error prone areas.
4.) The test cases are difficult to
design.
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White box Testing
Testing technique based on knowledge of the internal logic of an application’s code and includes tests Like coverage of code statements, branches, paths, conditions. It is performed by software developers.
White box testing is the
detailed investigation of internal logic and structure of the code. White box
testing is also called glass testing or open box testing. In order to perform
white box testing on an application, the tester needs to possess knowledge of
the internal working of the code.
The tester needs to have a
look inside the source code and find out which unit/chunk of the code is
behaving inappropriately.
Advantages
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Disadvantages
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1.) As the tester has knowledge of the source code, it becomes
very easy to find out which type of data can help in testing the application
effectively.
2.) It helps in optimizing the code.
3.) Extra lines of code can be removed which can bring in
hidden defects.
4.) Due to the tester's knowledge about the code, maximum
coverage is attained during test scenario writing.
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1.) Due to the fact that a skilled tester is needed to perform
white box testing, the costs are increased.
2.) Sometimes it is impossible to look into every nook and
corner to find out hidden errors that may create problems as many paths will
go untested.
3.) It is difficult to maintain white box testing as the use
of specialized tools like code analyzers and debugging tools are required.
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