Following
are the most common test methodologies that are followed to test
A
product
1)
Black box testing
2)
White box testing
3)
Gray box testing
Black box testing:-
Is the most common test
methodology which is very frequently used to test the Product Testing is done
with out knowing the internal structure of the application or the code. Black
box testing can be considered testing with respect to the specifications.
Advantages
of black box testing:-
1) More effective on larger
units of code than white box testing
2) Tester needs no
knowledge of implementation, including specific programming Lang.
3) Tester and programmer
are independent of each other
4) Tests are done from a
user's point of view
5) Will help to expose any
ambiguities or inconsistencies in the specifications
6) Test cases can be
designed as soon as the specifications are complete
White box testing:-
Examines the program
structure and derive test data from the program logic. Structural testing is
sometimes referred to as clear-box testing since white boxes are considered
opaque and do not really permit visibility into the code.
Advantages
of White Box Testing
1)
Forces test developer to reason carefully about implementation
2)
Approximates the partitioning done by execution equivalence
3)
Reveals errors in "hidden" code
4)
Beneficent side-effects
5)
Optimizations (e.g. chartable that changes reps when size > 100)
Few
of the white box testing techniques are
1)
Syclomatic complexity
2)
Branch coverage
3)
Path coverage
4)
Statement coverage
Gray box testing:-
Is a combination of black
box and white box testing. In this type of test approach Part of the
application will be tested with white box testing and remaining application
features are tested with black box testing methodology.
(Note)Selection of the module which has the
maximum impact on other modules of the
Application
should be considered for white box testing and rest of the modules Should be
tested with black box testing.
