[Mailman-Developers] virtualenv and nose2 replace zc.buildout and zope.testing

Barry Warsaw writes:

A while ago I mentioned that I was trying to get rid of zc.buildout to build Mailman 3 and zope.testing to test it. This work is now complete and pushed to trunk.

Yee-haw!

(and giddyap, GSOC students! fix them tests!)