As part of bug 1304101, we moved all of the main Balrog app's test dependencies to a requirements file (https://github.com/mozilla/balrog/commit/d75baafc94ad2f19aeb09a1912de76da0ad28981#diff-979cba9d30281710825398788016ac05L1), and pinned them. We should do the same for the Balrog Agent. As things stand right now, we sometimes see failures when coverage or other packages specified in https://github.com/mozilla/balrog/blob/master/agent/tox.ini release new versions.
Commit pushed to master at https://github.com/mozilla/balrog https://github.com/mozilla/balrog/commit/a719c7991ccb7c8a4cf9aaef71bb6195848e6a20 Bug 1326046: Move dependencies from tox.ini into requirements-test.txt (#303). r=bhearsum
This is in production now, thanks ichiato!