[tests] Handle failing test on OS X.
[tests] Handle failing test on OS X.

quangnguyen90/predis,RedisLabs/predis,moria/predis,lvbaosong/predis,zhangyancoder/predis,WalterShe/predis,channelgrabber/predis,SwelenFrance/predis,CloudSide/predis,gopalindians/predis,dominics/predis,mrkeng/predis,nrk/predis,nguyenthaihan/predis,vend/predis,protomouse/predis,stokes3452/predis,dzung2t/predis,johnhelmuth/predis,oswaldderiemaecker/predis,RudyJessop/predis,SecureCloud-biz/predis,gencer/predis