Acquia has a continuous integration and build system that constantly downloads new source code and tests it. Here you will find the results running from all the unit tests found in Drupal Core trunk. Results are updated daily.

Nightly Test Results of Drupal CVS HEAD (D7)

Coverage report - Code Coverage report showing how much of the code is covered by running the tests and which lines where covered and not covered. Also shows which files where not tested at all.

System Details:
Ubuntu 8.04 Single CPU on Vmware ESX, 1GB RAM
PHP 5.2.4
Apache 2.2.8
MySQL 5.0.51a using MyISAM