+++ This bug was initially created as a clone of Bug #594281 +++ If we get several builds all queued in the space of one build, unit tests get delayed for a long time. For example: 1) Queue three builds a, b and c. 2) a runs to completion, tests for a are queued, but b was queued first so that runs first. 3) b finishes, tests for b are queued, but c was queued first still 4) c finishes, tests for a b and c are then run. This can delay unit tests for several hours for the first run. As tests are typically shorter than builds, I think we should be making sure they happen earlier.

Fixed by http://hg.mozilla.org/build/buildbot-configs/rev/6bef7e9e6b9f