I noticed that the pypy3 job in travis doesn't seem to be doing anything except building and installing into the toxenv. Is that on purpose? Check out [0] as an example job. I think the TOXENV isn't being set properly - it's just "pypy3" instead of "pypy3-unit"

[0] https://travis-ci.org/github/celery/celery/jobs/735267307