PHP Unit Testing

PHP Developers are said to be slackers when it comes to unit testing. Do you do it?

Here's some resources:

What is PHP Unit Testing:
http://www.phpkitchen.com/index.php?/archives/705-What-is-Unit-Testing.html
Php Unit Testing tutorial:
http://www.lastcraft.com/first_test_tutorial.php
PhpUnit
http://sourceforge.net/projects/phpunit/
Open Source PHP Developer Tools:
http://www.opensourcetesting.org/unit_php.php

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