Testing in an Agile development team

I have been reading up on Agile development over the last few weeks, and one thing that has concerned me when looking at Xtreme Programming is the apparent lack of dedicated testing staff. Indeed some proponents feel there is no need for any specialists at all. The view is that each developer tests their own unit of code.

But, there is much more to testing than testing individual units. There is integration and system testing as well as performance, resilience and load testing. However, the developers feel that they are not skilled enough to do anything except unit testing.

I was happy to come across a couple of sites that to me at least, put forward a more balanced approach to development and testing. One of them, testobsessed.com I have found to be particularly helpful.