Minor change to `ArcanistInfrastructureTestCase`
Minor change to `ArcanistInfrastructureTestCase`

Summary: Update `ArcanistInfrastructureTestCase` after D9860 and D9861.

Test Plan: `arc unit` should do the trick.

Reviewers: #blessed_reviewers, epriestley

Reviewed By: #blessed_reviewers, epriestley

Subscribers: epriestley, Korvin

Differential Revision: https://secure.phabricator.com/D9863

alexmv/arcanist,codelabs-ch/arcanist,eSpark/arcanist,phacility/arcanist,phacility/arcanist,jra3/arcanist,codelabs-ch/arcanist,kevinseelbach/arcanist,wharris/arcanist,aik099/arcanist,folsom-labs/arcanist,aik099/arcanist,haskell-infra/arcanist,jra3/arcanist,chundongwang/arcanist,dguo-coursera/arcanist,alexmv/arcanist,haskell-infra/arcanist,folsom-labs/arcanist,calblueprint/arcanist,dguo-coursera/arcanist,KieranHayes/arcanist,coursera/arcanist,dguo-coursera/arcanist,uber/arcanist,fivestars/arcanist,codelabs-ch/arcanist,haskell-infra/arcanist,wikimedia/phabricator-arcanist,wxstars/arcanist,hach-que/arcanist,memsql/arcanist,coursera/arcanist,PageUpPeopleOrg/arcanist-patches,r4nt/arcanist,aik099/arcanist,phacility/arcanist,Khan/arcanist,zhihu/arcanist,hach-que/arcanist,codelabs-ch/arcanist,sneakpeeq/arcanist,wharris/arcanist,Khan/arcanist,wxstars/arcanist,folsom-labs/arcanist,sneakpeeq/arcanist,chundongwang/arcanist,Symplicity/arcanist,chundongwang/arcanist,uber/arcanist,kevinseelbach/arcanist,Symplicity/arcanist,KieranHayes/arcanist,wharris/arcanist,kevinseelbach/arcanist,folsom-labs/arcanist,jra3/arcanist,PageUpPeopleOrg/arcanist-patches,phacility/arcanist,r4nt/arcanist,Symplicity/arcanist,KieranHayes/arcanist,PageUpPeopleOrg/arcanist-patches,aik099/arcanist,sneakpeeq/arcanist,coursera/arcanist,memsql/arcanist,coursera/arcanist,uber/arcanist,wikimedia/phabricator-arcanist,eSpark/arcanist,fivestars/arcanist,r4nt/arcanist,alexmv/arcanist,jra3/arcanist,uber/arcanist,phacility/arcanist,zhihu/arcanist,KieranHayes/arcanist,codelabs-ch/arcanist,memsql/arcanist,wharris/arcanist,calblueprint/arcanist,alexmv/arcanist,eSpark/arcanist,chundongwang/arcanist,sneakpeeq/arcanist,PageUpPeopleOrg/arcanist-patches,r4nt/arcanist,zhihu/arcanist,dguo-coursera/arcanist,memsql/arcanist,hach-que/arcanist,wxstars/arcanist,Symplicity/arcanist,wxstars/arcanist,wikimedia/phabricator-arcanist,fivestars/arcanist,Khan/arcanist,hach-que/arcanist,calblueprint/arcanist,zhihu/arcanist,kevinseelbach/arcanist,fivestars/arcanist,eSpark/arcanist,haskell-infra/arcanist,wikimedia/phabricator-arcanist,Khan/arcanist,calblueprint/arcanist