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levels of testing

Answer Posted / guest

1)unit testing
2)integration testing
3)system testing
4)user acceptace testing

1)unit testing:
individual software components of appication are tested in
isolation from other part of the program.



bigban testing: individual software components of an
aplivation are combined at once into system .every module i
s first init tested.then the entire sysetm is tested for
communication interfaces between them.


bottom-up testing:
in bottom-up integration testing begins from bottom of
the module hierarchy and work up to the top to simulate
higher level modules .every module is first unit tested
then modules are added in acsending hierarchial order.lower
level modules are tested first then the next set of higher
level modules are tested with previuosly tested lower level
modules.


top-down testing:
begins testing from top of the module hierarchy and
work down to the bottom to simulate lower interfacing
modules.every module is first unit tested then the modules
are added in descending hierarchial order.higher level
modules are tested first then the next set of lower level
modules are tested with previously tested higher level
modules.





















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