Answer Posted / raj
Integration testing, also known as integration and testing
(I&T), is a software development process which program units
are combined and tested as groups in multiple ways. In this
context, a unit is defined as the smallest testable part of
an application. Integration testing can expose problems with
the interfaces among program components before trouble
occurs in real-world program execution. Integration testing
is a component of Extreme Programming (XP), a pragmatic
method of software development that takes a meticulous
approach to building a product by means of continual testing
and revision.
There are two major ways of carrying out an integration
test, called the bottom-up method and the top-down method.
Bottom-up integration testing begins with unit testing,
followed by tests of of progressively higher-level
combinations of units called modules or builds. In top-down
integration testing, the highest-level modules are tested
first and progressively lower-level modules are tested after
that. In a comprehensive software development environment,
bottom-up testing is usually done first, followed by top-
down testing. The process concludes with multiple tests of
the complete application, preferably in scenarios designed
to mimic those it will encounter in customers' computers,
systems and networks.
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