Railsers et al:
Anyone developing Ajax applications needs to read my new Short Cut, at O'Reilly:
"Test Driven Ajax (on Rails)"
The paper shows how to write an Ajax website using these new assertions:
. assert_xml - check that HTML is XHTML and parsable
. assert_xpath - parse XHTML and extract specific details
. assert_ajax - run assertions when an Ajax command completes
The paper shows how to grow a test runner in a web page. It tests a target website inside an IFRAME.