At DrupalCamp Wroclaw I was talking about build and test automation in Drupal. Today i uploaded Virtualbox image where you can find configured Jenkins CI and the example of Drupal project with simple PHPUnit tests.
In Droptica all our projects are based on this workflow. We use special script for build and tests automation. The script is run automatically (by Jenkins) after each change in the repository. You can find this script and the example of Drupal project on vritualbox image.
More information about the project and download link you can find on page: Droptica DevServer