Tox as is a generic virtualenv_ management and test command line tool you can use for:
checking your package installs correctly with different Python versions and interpreters
running your tests in each of the environments, configuring your test tool of choice
acting as a frontend to Continous Integration servers, greatly reducing boilerplate and merging CI and shell-based testing.
For more information, docs and many examples please checkout:
http://codespeak.net/tox
have fun,
holger krekel, May 2011