Hi, I'm working on setting up both Nova and Neutron with constrained unit tests. More details about this can be found in the changes can be found in it's blueprint [0]. An example issue this will prevent is Neutron's recent gate breakage caused by a new netaddr version. [1] Now that the base changes have landed in project-config the next step is to modify tox.ini to run an alterniate install command when called with the 'constraints' factor. Nova: https://review.openstack.org/205931/ Neutron: https://review.openstack.org/219134/ This change is a no-op for current gate jobs and developer workflows, only adding the functionality required for the new constraints jobs and manual execution of the constrained tests when desired. Once these have been added we can then proceed adding the py27 and 34 jobs, which will be non-voting at this point. Nova: https://review.openstack.org/219582/ Neutron: https://review.openstack.org/219610/ [0] http://specs.openstack.org/openstack/openstack-specs/specs/requirements-management.html [1] http://lists.openstack.org/pipermail/openstack-dev/2015-August/073239.html If there are any other projects interested in being an early adopter of constrained unit tests, please let me know. Cheers, Sachi