Summary: Sometimes, the `PhabricatorInfrastructureTestCase` //would// fail, but we don't run it with `arc unit` because of the directory structure. See D9556 for an example.
Test Plan: This is essentially the same as D9557.
Reviewers: epriestley, #blessed_reviewers
Reviewed By: epriestley, #blessed_reviewers
Subscribers: epriestley, Korvin
Differential Revision: https://secure.phabricator.com/D9559
