Drupal Testbed - the 30 second introduction
So, you just got a response from the Drupal TestbedBot, ended up here, and now you're wondering what this is all about. It's really quite simple: Drupal Testbed(def. Testbed) tests patches for flaws, and thereby saves the effort of the Drupal.org volunteers. You can read more about at the Drupaltestbot project page, issue file test project page, and the simpletest project page on Drupal.org. This project is still in beta so we expect bugs; please file any you see at our project page. You can checkout the code using this command: svn co http://testing.drupal.org/rep/simpletestauto
We hope you enjoy it!
-Drupal Testbed Team
Examples of testing results on Drupal.org
Example of patch test success

Example of patch test failure

Example of subscribing for notification of patch test failure by email

Test driven development roadmap
At DrupalCon Barcelona about 20 people gathered together for the Quality Assurance Birds of a Feather session. This allowed us to develop a road map for automated testing and test driven development for the Drupal project. Please review the diagram to see what we discussed and view the checkmarks on the diagram to review the work we have achieved in the 2 months since that diagram was first produced.
Click here to see in detail

Diagrams of automated testing process

Drupal testing server process for testing patches.

Drupal testing for customer sites
Automated testing is a well know technique for improving quality and speeding up development cycles. Automated testing can help identify issues as they are introduced.
