Recently I released the 20051017 release of pgtools, a set of PostgreSQL agile database tools. As well, just today, I've added a page with step by step instructions for running the unit tests included with the example application. You can find that at http://pgtools.sourceforge.net/unit-test-demo.html
Enjoy!
This initial release of pgtools includes various shell functions to help with manipulation of PostgreSQL schemas, a unit testing system, and a sample application showing you how to write unit tests for your PostgreSQL schemas.