Yes - it's a problem with non-Linux platforms not being able to install pyudev, which is a requirement for the linuxbridge plugin, which makes testr barf when it hits an ImportError. http://lists.openstack.org/pipermail/openstack-dev/2014-January/023268.html In the past, I've run tox -e py26 as a workaround, since for some reason testr shrugs off the ImportError in python 2.6. -- Sean M. Collins