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UNIT TESTING is a level of testing where individual units/ components of a software are tested. The purpose is to validate that each unit of the software performs as designed. A unit is the smallest testable part of any software. It usually has one or a few inputs and usually a single output. In procedural programming, a unit may be an individual program, function, procedure, etc. In object-oriented programming, the smallest unit is a method, which may belong to a base/ super class, abstract class or derived/ child class. (Some treat a module of an application as a unit. This is to be discouraged as there will probably be many individual units within that module.) Unit testing frameworks, drivers, stubs, and mock/ fake objects are used to assist in unit testing.
Definition by ISTQB
unit testing: See component testing.
component testing: The testing of individual software components.
Unit Testing Method
It is performed by using the White Box Testingmethod.
When is it performed?
Unit Testing is the first level of software testing and is performed prior to Integration Testing.
Who performs it?
It is normally performed by software developers themselves or their peers. In rare cases, it may also be performed by independent software testers.Click Here..
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