First, thanks Adrian and everyone else for a great piece of software.
I recently created a Docker image to help in developing beets. This way, I can separate the dev installation from a regular installation of beets. I can also run tests without installing tox and other packages on the host machine.
I just wanted to post here in case other people find the image useful.
Docker hub: https://hub.docker.com/r/elfalem/beets-docker/