created a _setUp function to DRY up test setup; changed 'cleanup' to '_tearDown' and added default keys to remove
created a _setUp function to DRY up test setup; changed 'cleanup' to '_tearDown' and added default keys to remove

vestineo/jsdom,isaacs/jsdom,godmar/jsdom,selam/jsdom,robertknight/jsdom,aduyng/jsdom,kesla/jsdom,snuggs/jsdom,aduyng/jsdom,kangax/jsdom,beni55/jsdom,substack/jsdom,sirbrillig/jsdom,nicolashenry/jsdom,cpojer/jsdom,selam/jsdom,fiftin/jsdom,aduyng/jsdom,Sebmaster/jsdom,AshCoolman/jsdom,substack/jsdom,Zirro/jsdom,concord-consortium/jsdom,sirbrillig/jsdom,godmar/jsdom,crealogix/jsdom,lcstore/jsdom,vestineo/jsdom,crealogix/jsdom,evanlucas/jsdom,jeffcarp/jsdom,Ye-Yong-Chi/jsdom,danieljoppi/jsdom,fiftin/jsdom,iizukanao/jsdom,singlebrook/linkck,mbostock/jsdom,concord-consortium/jsdom,evanlucas/jsdom,jeffcarp/jsdom,fiftin/jsdom,dexteryy/jsdom-nogyp,Joris-van-der-Wel/jsdom,sebmck/jsdom,brianmcd/cloudbrowser-jsdom,danieljoppi/jsdom,brianmcd/cloudbrowser-jsdom,zaucy/jsdom,susaing/jsdom,dexteryy/jsdom-nogyp,isaacs/jsdom,szarouski/jsdom,janusnic/jsdom,robertknight/jsdom,danieljoppi/jsdom,nicolashenry/jsdom,Ye-Yong-Chi/jsdom,kevinold/jsdom,sebmck/jsdom,papandreou/jsdom,Sebmaster/jsdom,kevinold/jsdom,kittens/jsdom,zaucy/jsdom,medikoo/jsdom,kevinold/jsdom,kittens/jsdom,robertknight/jsdom,mzgol/jsdom,susaing/jsdom,kesla/jsdom,Joris-van-der-Wel/jsdom,evdevgit/jsdom,vestineo/jsdom,evdevgit/jsdom,nicolashenry/jsdom,darobin/jsdom,evdevgit/jsdom,papandreou/jsdom,cpojer/jsdom,lcstore/jsdom,kesla/jsdom,selam/jsdom,darobin/jsdom,Ye-Yong-Chi/jsdom,szarouski/jsdom,cpojer/jsdom,iizukanao/jsdom,AshCoolman/jsdom,jeffcarp/jsdom,lcstore/jsdom,kittens/jsdom,Sebmaster/jsdom,beni55/jsdom,tmpvar/jsdom,mbostock/jsdom,mzgol/jsdom,mbostock/jsdom,snuggs/jsdom,kangax/jsdom,janusnic/jsdom,susaing/jsdom,Joris-van-der-Wel/jsdom,darobin/jsdom,evanlucas/jsdom,AshCoolman/jsdom,janusnic/jsdom,tmpvar/jsdom,AVGP/jsdom,Zirro/jsdom,szarouski/jsdom,sebmck/jsdom,mzgol/jsdom,beni55/jsdom,sirbrillig/jsdom,medikoo/jsdom,zaucy/jsdom,AVGP/jsdom,medikoo/jsdom