what is the difference between unit testing,integration
testing and interface testing?

Answer Posted / satish

Unit Testing
------------
In computer programming, unit testing is a procedure used to
validate that individual units of source code are working
properly. A unit is the smallest testable part of an
application.

Integration Testing
-------------------
Integration Testing is the phase of software testing in
which individual software modules are combined and tested as
a group and verify proper communication between the modules.

Interface Testing
-----------------
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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