Add tests for unique_file
Add tests for unique_file

rlustin/letsencrypt,ahojjati/letsencrypt,digideskio/lets-encrypt-preview,TheBoegl/letsencrypt,stewnorriss/letsencrypt,wteiken/letsencrypt,kevinlondon/letsencrypt,Sveder/letsencrypt,Bachmann1234/letsencrypt,jmaurice/letsencrypt,kevinlondon/letsencrypt,rugk/letsencrypt,stewnorriss/letsencrypt,beermix/letsencrypt,bestwpw/letsencrypt,vcavallo/letsencrypt,g1franc/lets-encrypt-preview,diracdeltas/lets-encrypt-preview,lbeltrame/letsencrypt,rutsky/letsencrypt,goofwear/letsencrypt,dietsche/letsencrypt,kuba/letsencrypt,BillKeenan/lets-encrypt-preview,tyagi-prashant/letsencrypt,brentdax/letsencrypt,jsha/letsencrypt,ahojjati/letsencrypt,martindale/letsencrypt,fmarier/letsencrypt,hlieberman/letsencrypt,piru/letsencrypt,armersong/letsencrypt,TheBoegl/letsencrypt,bsmr-misc-forks/letsencrypt,Jadaw1n/letsencrypt,deserted/letsencrypt,solidgoldbomb/letsencrypt,kuba/letsencrypt,jsha/letsencrypt,Hasimir/letsencrypt,piru/letsencrypt,brentdax/letsencrypt,BillKeenan/lets-encrypt-preview,lmcro/letsencrypt,modulexcite/letsencrypt,rugk/letsencrypt,fmarier/letsencrypt,ruo91/letsencrypt,tyagi-prashant/letsencrypt,bsmr-misc-forks/letsencrypt,jtl999/certbot,wteiken/letsencrypt,deserted/letsencrypt,twstrike/le_for_patching,sjerdo/letsencrypt,xgin/letsencrypt,dietsche/letsencrypt,vcavallo/letsencrypt,DavidGarciaCat/letsencrypt,Bachmann1234/letsencrypt,goofwear/letsencrypt,g1franc/lets-encrypt-preview,Jonadabe/letsencrypt,ghyde/letsencrypt,xgin/letsencrypt,mrb/letsencrypt,sjerdo/letsencrypt,ruo91/letsencrypt,rlustin/letsencrypt,BKreisel/letsencrypt,mitnk/letsencrypt,modulexcite/letsencrypt,riseofthetigers/letsencrypt,VladimirTyrin/letsencrypt,VladimirTyrin/letsencrypt,jmaurice/letsencrypt,thanatos/lets-encrypt-preview,hsduk/lets-encrypt-preview,martindale/letsencrypt,tdfischer/lets-encrypt-preview,jtl999/certbot,skynet/letsencrypt,bestwpw/letsencrypt,Sveder/letsencrypt,skynet/letsencrypt,solidgoldbomb/letsencrypt,rutsky/letsencrypt,luorenjin/letsencrypt,PeterMosmans/letsencrypt,letsencrypt/letsencrypt,Hasimir/letsencrypt,jmhodges/letsencrypt,hsduk/lets-encrypt-preview,Jonadabe/letsencrypt,stweil/letsencrypt,letsencrypt/letsencrypt,jmhodges/letsencrypt,diracdeltas/lets-encrypt-preview,thanatos/lets-encrypt-preview,beermix/letsencrypt,twstrike/le_for_patching,PeterMosmans/letsencrypt,lbeltrame/letsencrypt,armersong/letsencrypt,lmcro/letsencrypt,stweil/letsencrypt,Jadaw1n/letsencrypt,sapics/letsencrypt,mrb/letsencrypt,riseofthetigers/letsencrypt,luorenjin/letsencrypt,digideskio/lets-encrypt-preview,hlieberman/letsencrypt,BKreisel/letsencrypt,DavidGarciaCat/letsencrypt,ghyde/letsencrypt,sapics/letsencrypt,tdfischer/lets-encrypt-preview,mitnk/letsencrypt