What do you mean by Unit Testing, Integration Testing, System Testing, and Use

What do you mean by Unit Testing, Integration Testing, System
Testing, and User Acceptance Testing and when do you do them?

Question Posted / vamshi

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What do you mean by Unit Testing, Integration Testing, System Testing, and User Acceptance Testing..

Answer / prasanna

Unit Testing: It is the process of testing the application
software at unit control structure.

Intergration Testing: Combining all the modules and tested
as a group.

System Testing: Testing the application fuctionality for
the first time once all the modules are interegrated .

User Acceptance Testing: It is a process of testing the
system by the end user or clients based on business
specifications

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What do you mean by Unit Testing, Integration Testing, System Testing, and User Acceptance Testing..

Answer / dheeraj shandilya

Testing is a process that includes many activity to assess
the application's quality.This testing is done at four
level. The first level is Unit Testing, here we test each
module or unit of application separately.
Second level is Integration level testing, here we integrate
some of the unit(module) that we tested separately at unit
level to test the interface between different module, their
interaction etc.
At third level we do System testing, here we test the whole
application at one go. here we test that the application is
satisfying the requirement or not.
Last level is Acceptance level, here the application is
tested by end users or small group of different
organization/team based on business scenario.

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