 The most
common misconception about unit testing frameworks is that they are
only testing tools. They are development tools same as your editor and
compiler. Don't keep this powerful development tool in reserve until
the last month of the project, use it throughout. Your unit testing
framework can help you formalize
requirements, clarify architecture, write code, debug code,
integrate code, release, optimize, and of course test.
Unit
testing frameworks are not hard to create from scratch. It is worth the
effort to create your own because you will understand it better and be
able to tailor it to your own needs. A simple change to the unit
testing framework can often save you large amounts of development time.
But to realize this savings you must feel comfortable and confident
about extending your framework.
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Most
languages already have a unit testing framework available for download
from XProgramming.com.
Use this free version as a starting point. See how it works, then
create your own. The team must claim ownership of the unit testing
framework and be able to change any part of it. JUnit is quickly
becoming the standard for unit testing in Java. If you download a unit
test framework refactor it and make it your own so you understand how
to extend it. 
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