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Level of Testing

Unit Testing is a level of software 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 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.

Integration Testing is a level of software testing where individual units are combined and tested as a group.The purpose of this level of testing is to expose faults in the interaction between integrated units. Test drivers and test stubs are used to assist in Integration Testing.Integration Testing is performed after Unit Testing and before System Testing.

System Testing is a level of the software testing where a complete and integrated software is tested.
The purpose of this test is to evaluate the system’s compliance with the specified requirements.The process of testing an integrated system to verify that it meets specified
requirements.System Testing is performed after Integration Testing and before Acceptance Testing.

Acceptance Testing is a level of the software testing where a system is tested for acceptability.
The purpose of this test is to evaluate the system’s compliance with the business requirements and assess whether it is acceptable for delivery.Formal testing with respect to user needs, requirements, and business processes conducted to determine  whether or not a system satisfies the acceptance criteria and to enable the user, customers or other authorized entity to determine whether or not to accept the system.


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