stefanpenner/ember-cli — pull request #862 by rjackson (2014-05-30 01:56:49+00:00)
Title: Allow concurrent `ember test --server` and `ember server`.

Prior to this, both `ember server` and `ember test --server` attempted to write to (and clear) `tmp/output`. This allows the test task to use a custom randomly named temp dir instead (which prevents the collision).