[hack] Add unit tests for Matcher.patch_expr
[hack] Add unit tests for Matcher.patch_expr

Summary: As title

Reviewed By: @hermanventer

Differential Revision: D2530916

fb-gh-sync-id: 236a7ad24e723405c3bc6120f0481cda837b5bfa

gabelevi/flow,gabro/flow,popham/flow,Eyyub/flow,nmote/flow,ForbesLindesay/flow,fletcherw/flow,jdelStrother/flow,shiftcars/flow,AgentME/flow,jdelStrother/flow,jgrund/flow,d14b3l/flow,mroch/flow,popham/flow,nmote/flow,jgrund/flow,chenglou/flow,AprilArcus/flow,chenglou/flow,gabelevi/flow,nmote/flow,fletcherw/flow,AprilArcus/flow,claudiopro/flow,graue/flow,popham/flow,AgentME/flow,TiddoLangerak/flow,shiftcars/flow,AprilArcus/flow,cesarandreu/flow,ForbesLindesay/flow,jamesgpearce/flow,popham/flow,MichaelDeBoey/flow,jamesgpearce/flow,jeffmo/flow,Eyyub/flow,gabro/flow,chenglou/flow,gabelevi/flow,cesarandreu/flow,TiddoLangerak/flow,OCamlPro/flow,ForbesLindesay/flow,facebook/flow,jgrund/flow,fletcherw/flow,AprilArcus/flow,AgentME/flow,jdelStrother/flow,ylu1317/flow,facebook/flow,facebook/flow,ylu1317/flow,claudiopro/flow,mroch/flow,mroch/flow,samwgoldman/flow,facebook/flow,nmote/flow,shiftcars/flow,jdelStrother/flow,fletcherw/flow,samwgoldman/flow,popham/flow,TiddoLangerak/flow,claudiopro/flow,d14b3l/flow,JonathanUsername/flow,TiddoLangerak/flow,d14b3l/flow,gabelevi/flow,jgrund/flow,jgrund/flow,chenglou/flow,JonathanUsername/flow,jdelStrother/flow,chenglou/flow,samwgoldman/flow,OCamlPro/flow,MichaelDeBoey/flow,AgentME/flow,ylu1317/flow,TiddoLangerak/flow,mroch/flow,Eyyub/flow,graue/flow,MichaelDeBoey/flow,ForbesLindesay/flow,jeffmo/flow,shiftcars/flow,JonathanUsername/flow,cesarandreu/flow,AprilArcus/flow,d14b3l/flow,d14b3l/flow,fletcherw/flow,claudiopro/flow,ForbesLindesay/flow,facebook/flow,jdelStrother/flow,nmote/flow,jeffmo/flow,facebook/flow,MichaelDeBoey/flow,JonathanUsername/flow,jeffmo/flow,samwgoldman/flow,gabelevi/flow,OCamlPro/flow,gabro/flow,jamesgpearce/flow,gabelevi/flow,JonathanUsername/flow,graue/flow,fletcherw/flow,JonathanUsername/flow,gabelevi/flow,ylu1317/flow,d14b3l/flow,jeffmo/flow,gabro/flow,MichaelDeBoey/flow,claudiopro/flow,jamesgpearce/flow,samwgoldman/flow,jeffmo/flow,popham/flow,ForbesLindesay/flow,JonathanUsername/flow,graue/flow,samwgoldman/flow,gabro/flow,AgentME/flow,gabro/flow,AprilArcus/flow,OCamlPro/flow,mroch/flow,Eyyub/flow,chenglou/flow,shiftcars/flow,jamesgpearce/flow,samwgoldman/flow,cesarandreu/flow,facebook/flow,mroch/flow,shiftcars/flow,graue/flow,ylu1317/flow,nmote/flow,mroch/flow,nmote/flow,jamesgpearce/flow,jgrund/flow,graue/flow,popham/flow,jamesgpearce/flow