We have a slimmed down version of SimpleTest 1.0.1beta2 in my repository ( https://4si.devguard.com/svn/public/simpletest readable by anonymous, get commit rights by contacting me ). The browser now supports uploads. Now every tests starts from a fresh default.profile Drupal install. There were serious cleanups. I expect simpletest to be submitted for core inclusion this weekend. Remaining tasks are more cleanup and more slimming down and updating the slimmed down code to RC1. If you want to work on these, do not hesitate to contacting me me.
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I salute you. Your efforts will go a long way to help Drupal and all contributors. Many thanks.
Do not forget him, he did a LOT of this work.