Make the test compatible with running under WBCS
This is only necessary until https://phabricator.wikimedia.org/T216206 is done
Bug: T216206
Change-Id: I8a66bb8b1785ffbedd590cddc5deea6a3ee7b9b4
Depends-On: I9bbea3d13460ed44755d77fc61ff23fb906cf71e