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what is the difference between unit testing,integration
testing and interface testing?
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Answer Posted / sandeep mukherjee
In computer programming, unit testing is a software
verification and validation method where the programmer
gains confidence that individual units of source code are
fit for use. A unit is the smallest testable part of an
application. In procedural programming a unit may be an
individual program, function, procedure, etc., while in
object-oriented programming, the smallest unit is a class,
which may belong to a base/super class, abstract class or
derived/child class.
Integration testing (sometimes called Integration and
Testing, abbreviated "I&T") is the activity[1] of software
testing in which individual software modules are combined
and tested as a group. It occurs after unit testing and
before system testing.
System testing of software or hardware is testing conducted
on a complete, integrated system to evaluate the system's
compliance with its specified requirements. System testing
falls within the scope of black box testing, and as such,
should require no knowledge of the inner design of the code
or logic.
Interface Testing is not focussed on what the components are
doing but on how they communicate with each other, as
specified in the "System Design".The tests are organized to
check all the interfaces, until all the components have been
built and interfaced to each other producing the whole
system.
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