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Types of testing

Helana Neumann
Greenhorn

Joined: Feb 07, 2008
Posts: 19
Hi, Christian,

What is unit testing, exactly, and how does it differ from other sorts of testing?

Thank you.

Best,
Helana Neumann
Christian Johansen
author
Ranch Hand

Joined: Oct 03, 2010
Posts: 46
Hi Helana,

A unit test is a small piece of code (function/method) that exercises some other code and verifies its expectations of its results. Unit tests typically test single behaviors of a system in isolation, and is aimed at catching method-level errors and providing a safety-net in which regressions can be caught. In TDD unit tests are also used to drive development and to guide the design of the code.

Unit testing is a developer activity, which sets it apart from how some large organizations do acceptance testing, as an example (i.e. organizations that have their own QA department/people).
 
It is sorta covered in the JavaRanch Style Guide.
 
subject: Types of testing
 
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