From some chats:

http://docs.google.com/View?docid=dgzf39jp_7tmcr5jc5 :

    * table prefix is separated so it's easy to create moodle_database instances with different prefixes.
    * able to test execute test agains multiple DBs by:
       1. Having some interface in admin to define them
       2. Make tests happen against all them
       3. If no alternate DBs are defined, tets default to current one (config.php one)
    * will go to dml/simpletest and ddl/simpletest

HQ chat:

    * able to be executed with one CLI script.
    * able to generate one cool page with all test results.
    * able to report by email about problems.

Ciao :-)