Remove wrong assumptions from inventory unit spec [Fixes #3111]
Remove wrong assumptions from inventory unit spec [Fixes #3111]

That caused specs to fail on postgresql

reinaris/spree,Engeltj/spree,DynamoMTL/spree,robodisco/spree,yiqing95/spree,biagidp/spree,CJMrozek/spree,jparr/spree,sfcgeorge/spree,robodisco/spree,bonobos/solidus,KMikhaylovCTG/spree,HealthWave/spree,zaeznet/spree,patdec/spree,brchristian/spree,rakibulislam/spree,alejandromangione/spree,SadTreeFriends/spree,jparr/spree,Engeltj/spree,reinaris/spree,lyzxsc/spree,xuewenfei/solidus,yiqing95/spree,Kagetsuki/spree,jasonfb/spree,Ropeney/spree,ckk-scratch/solidus,trigrass2/spree,Nevensoft/spree,urimikhli/spree,vmatekole/spree,forkata/solidus,jspizziri/spree,imella/spree,shaywood2/spree,reinaris/spree,surfdome/spree,ramkumar-kr/spree,tesserakt/clean_spree,jimblesm/spree,karlitxo/spree,rbngzlv/spree,delphsoft/spree-store-ballchair,madetech/spree,derekluo/spree,firman/spree,grzlus/solidus,vinayvinsol/spree,locomotivapro/spree,omarsar/spree,maybii/spree,devilcoders/solidus,adaddeo/spree,tailic/spree,odk211/spree,surfdome/spree,priyank-gupta/spree,raow/spree,Senjai/solidus,lsirivong/solidus,hoanghiep90/spree,watg/spree,jparr/spree,kewaunited/spree,joanblake/spree,zamiang/spree,edgward/spree,imella/spree,firman/spree,caiqinghua/spree,jordan-brough/solidus,zaeznet/spree,SadTreeFriends/spree,jsurdilla/solidus,vmatekole/spree,useiichi/spree,FadliKun/spree,keatonrow/spree,tancnle/spree,jasonfb/spree,delphsoft/spree-store-ballchair,CiscoCloud/spree,useiichi/spree,pervino/solidus,Mayvenn/spree,fahidnasir/spree,firman/spree,joanblake/spree,alejandromangione/spree,bjornlinder/Spree,jasonfb/spree,berkes/spree,dafontaine/spree,derekluo/spree,zaeznet/spree,lsirivong/spree,vinsol/spree,Machpowersystems/spree_mach,Nevensoft/spree,cutefrank/spree,camelmasa/spree,caiqinghua/spree,Engeltj/spree,brchristian/spree,PhoenixTeam/spree_phoenix,camelmasa/spree,LBRapid/spree,Boomkat/spree,thogg4/spree,jimblesm/spree,vcavallo/spree,Hawaiideveloper/shoppingcart,agient/agientstorefront,miyazawatomoka/spree,kitwalker12/spree,thogg4/spree,richardnuno/solidus,wolfieorama/spree,degica/spree,miyazawatomoka/spree,net2b/spree,shaywood2/spree,pulkit21/spree,shioyama/spree,rajeevriitm/spree,project-eutopia/spree,firman/spree,abhishekjain16/spree,tailic/spree,Hates/spree,quentinuys/spree,sliaquat/spree,rbngzlv/spree,vinayvinsol/spree,caiqinghua/spree,Mayvenn/spree,welitonfreitas/spree,devilcoders/solidus,Migweld/spree,dandanwei/spree,freerunningtech/spree,siddharth28/spree,zaeznet/spree,patdec/spree,agient/agientstorefront,piousbox/spree,dotandbo/spree,project-eutopia/spree,PhoenixTeam/spree_phoenix,miyazawatomoka/spree,woboinc/spree,ahmetabdi/spree,athal7/solidus,jeffboulet/spree,TrialGuides/spree,cutefrank/spree,vinsol/spree,volpejoaquin/spree,welitonfreitas/spree,quentinuys/spree,CJMrozek/spree,grzlus/spree,mindvolt/spree,beni55/spree,edgward/spree,keatonrow/spree,edgward/spree,TrialGuides/spree,ayb/spree,imella/spree,quentinuys/spree,brchristian/spree,gregoryrikson/spree-sample,NerdsvilleCEO/spree,StemboltHQ/spree,joanblake/spree,kitwalker12/spree,StemboltHQ/spree,berkes/spree,RatioClothing/spree,jhawthorn/spree,nooysters/spree,sideci-sample/sideci-sample-spree,vinayvinsol/spree,Arpsara/solidus,HealthWave/spree,rakibulislam/spree,yomishra/pce,hifly/spree,berkes/spree,piousbox/spree,ahmetabdi/spree,kewaunited/spree,biagidp/spree,Senjai/solidus,rakibulislam/spree,radarseesradar/spree,pervino/spree,jimblesm/spree,agient/agientstorefront,richardnuno/solidus,grzlus/solidus,jsurdilla/solidus,jspizziri/spree,NerdsvilleCEO/spree,dotandbo/spree,freerunningtech/spree,lsirivong/spree,adaddeo/spree,athal7/solidus,lyzxsc/spree,yiqing95/spree,odk211/spree,alvinjean/spree,builtbybuffalo/spree,vmatekole/spree,progsri/spree,hifly/spree,orenf/spree,vulk/spree,locomotivapro/spree,SadTreeFriends/spree,Kagetsuki/spree,ayb/spree,Mayvenn/spree,ujai/spree,JuandGirald/spree,beni55/spree,wolfieorama/spree,priyank-gupta/spree,PhoenixTeam/spree_phoenix,mindvolt/spree,ramkumar-kr/spree,useiichi/spree,carlesjove/spree,JDutil/spree,cutefrank/spree,TimurTarasenko/spree,Boomkat/spree,joanblake/spree,alejandromangione/spree,odk211/spree,sliaquat/spree,tomash/spree,Ropeney/spree,builtbybuffalo/spree,Lostmyname/spree,groundctrl/spree,TimurTarasenko/spree,locomotivapro/spree,njerrywerry/spree,beni55/spree,trigrass2/spree,sunny2601/spree,jsurdilla/solidus,mleglise/spree,jordan-brough/spree,forkata/solidus,gregoryrikson/spree-sample,Ropeney/spree,Hawaiideveloper/shoppingcart,azranel/spree,caiqinghua/spree,CJMrozek/spree,devilcoders/solidus,jaspreet21anand/spree,rajeevriitm/spree,welitonfreitas/spree,CJMrozek/spree,quentinuys/spree,groundctrl/spree,fahidnasir/spree,Arpsara/solidus,mindvolt/spree,karlitxo/spree,net2b/spree,volpejoaquin/spree,richardnuno/solidus,StemboltHQ/spree,moneyspyder/spree,hifly/spree,Ropeney/spree,degica/spree,njerrywerry/spree,shioyama/spree,yushine/spree,odk211/spree,alepore/spree,Migweld/spree,rakibulislam/spree,gautamsawhney/spree,DarkoP/spree,surfdome/spree,hifly/spree,madetech/spree,radarseesradar/spree,JuandGirald/spree,yomishra/pce,pjmj777/spree,ramkumar-kr/spree,tesserakt/clean_spree,sfcgeorge/spree,moneyspyder/spree,vulk/spree,reidblomquist/spree,ujai/spree,freerunningtech/spree,carlesjove/spree,camelmasa/spree,kewaunited/spree,grzlus/solidus,pervino/spree,builtbybuffalo/spree,jhawthorn/spree,knuepwebdev/FloatTubeRodHolders,njerrywerry/spree,tomash/spree,progsri/spree,tomash/spree,lsirivong/spree,ahmetabdi/spree,jaspreet21anand/spree,Senjai/spree,priyank-gupta/spree,DynamoMTL/spree,camelmasa/spree,JuandGirald/spree,softr8/spree,sfcgeorge/spree,watg/spree,pjmj777/spree,rbngzlv/spree,sunny2601/spree,archSeer/spree,reidblomquist/spree,calvinl/spree,azclick/spree,SadTreeFriends/spree,volpejoaquin/spree,shaywood2/spree,knuepwebdev/FloatTubeRodHolders,scottcrawford03/solidus,robodisco/spree,APohio/spree,orenf/spree,grzlus/spree,jasonfb/spree,jhawthorn/spree,Lostmyname/spree,yiqing95/spree,yomishra/pce,Migweld/spree,Migweld/spree,ramkumar-kr/spree,scottcrawford03/solidus,vcavallo/spree,alejandromangione/spree,dafontaine/spree,RatioClothing/spree,gregoryrikson/spree-sample,abhishekjain16/spree,vulk/spree,xuewenfei/solidus,ckk-scratch/solidus,lyzxsc/spree,jordan-brough/spree,lsirivong/solidus,moneyspyder/spree,net2b/spree,beni55/spree,cutefrank/spree,vulk/spree,Machpowersystems/spree_mach,reidblomquist/spree,azclick/spree,bonobos/solidus,HealthWave/spree,dotandbo/spree,ujai/spree,orenf/spree,jimblesm/spree,gautamsawhney/spree,TimurTarasenko/spree,wolfieorama/spree,vcavallo/spree,Senjai/spree,gautamsawhney/spree,project-eutopia/spree,berkes/spree,Senjai/solidus,Boomkat/spree,delphsoft/spree-store-ballchair,radarseesradar/spree,azranel/spree,sunny2601/spree,LBRapid/spree,carlesjove/spree,assembledbrands/spree,APohio/spree,shaywood2/spree,karlitxo/spree,hoanghiep90/spree,thogg4/spree,robodisco/spree,tancnle/spree,shekibobo/spree,NerdsvilleCEO/spree,jspizziri/spree,orenf/spree,JDutil/spree,assembledbrands/spree,project-eutopia/spree,archSeer/spree,jparr/spree,azclick/spree,azranel/spree,bricesanchez/spree,njerrywerry/spree,gautamsawhney/spree,CiscoCloud/spree,richardnuno/solidus,APohio/spree,watg/spree,mleglise/spree,dafontaine/spree,PhoenixTeam/spree_phoenix,nooysters/spree,forkata/solidus,mindvolt/spree,builtbybuffalo/spree,raow/spree,zamiang/spree,rajeevriitm/spree,yushine/spree,tancnle/spree,wolfieorama/spree,TrialGuides/spree,biagidp/spree,tailic/spree,priyank-gupta/spree,DarkoP/spree,Boomkat/spree,FadliKun/spree,lsirivong/spree,devilcoders/solidus,yushine/spree,pervino/solidus,DynamoMTL/spree,DarkoP/spree,grzlus/spree,dotandbo/spree,dandanwei/spree,xuewenfei/solidus,hoanghiep90/spree,carlesjove/spree,tesserakt/clean_spree,archSeer/spree,NerdsvilleCEO/spree,Hawaiideveloper/shoppingcart,Kagetsuki/spree,edgward/spree,urimikhli/spree,calvinl/spree,jordan-brough/spree,degica/spree,lsirivong/solidus,vinsol/spree,bricesanchez/spree,azclick/spree,Lostmyname/spree,thogg4/spree,vmatekole/spree,Lostmyname/spree,urimikhli/spree,APohio/spree,kitwalker12/spree,sideci-sample/sideci-sample-spree,siddharth28/spree,CiscoCloud/spree,FadliKun/spree,volpejoaquin/spree,groundctrl/spree,jaspreet21anand/spree,mleglise/spree,jeffboulet/spree,forkata/solidus,maybii/spree,abhishekjain16/spree,pulkit21/spree,JDutil/spree,fahidnasir/spree,Engeltj/spree,omarsar/spree,Senjai/solidus,miyazawatomoka/spree,lsirivong/solidus,assembledbrands/spree,DynamoMTL/spree,adaddeo/spree,dandanwei/spree,piousbox/spree,brchristian/spree,maybii/spree,shekibobo/spree,xuewenfei/solidus,LBRapid/spree,nooysters/spree,scottcrawford03/solidus,sideci-sample/sideci-sample-spree,KMikhaylovCTG/spree,sunny2601/spree,agient/agientstorefront,siddharth28/spree,calvinl/spree,alepore/spree,reinaris/spree,bricesanchez/spree,pervino/solidus,gregoryrikson/spree-sample,alvinjean/spree,surfdome/spree,dandanwei/spree,CiscoCloud/spree,zamiang/spree,athal7/solidus,nooysters/spree,tomash/spree,jaspreet21anand/spree,Mayvenn/spree,Hates/spree,maybii/spree,jeffboulet/spree,shekibobo/spree,abhishekjain16/spree,useiichi/spree,kewaunited/spree,sliaquat/spree,Nevensoft/spree,ckk-scratch/solidus,sfcgeorge/spree,pjmj777/spree,omarsar/spree,hoanghiep90/spree,TimurTarasenko/spree,reidblomquist/spree,pervino/spree,piousbox/spree,archSeer/spree,shioyama/spree,jordan-brough/solidus,progsri/spree,ayb/spree,softr8/spree,vinayvinsol/spree,progsri/spree,shekibobo/spree,fahidnasir/spree,scottcrawford03/solidus,JDutil/spree,Arpsara/solidus,net2b/spree,lyzxsc/spree,alepore/spree,ayb/spree,mleglise/spree,AgilTec/spree,keatonrow/spree,AgilTec/spree,derekluo/spree,rajeevriitm/spree,locomotivapro/spree,yushine/spree,radarseesradar/spree,softr8/spree,ahmetabdi/spree,athal7/solidus,bonobos/solidus,delphsoft/spree-store-ballchair,Hawaiideveloper/shoppingcart,grzlus/spree,Hates/spree,alvinjean/spree,raow/spree,Nevensoft/spree,pulkit21/spree,DarkoP/spree,bjornlinder/Spree,patdec/spree,moneyspyder/spree,zamiang/spree,raow/spree,omarsar/spree,alvinjean/spree,jordan-brough/solidus,grzlus/solidus,vcavallo/spree,JuandGirald/spree,pervino/solidus,calvinl/spree,Arpsara/solidus,karlitxo/spree,vinsol/spree,sliaquat/spree,AgilTec/spree,jordan-brough/solidus,trigrass2/spree,trigrass2/spree,Senjai/spree,tesserakt/clean_spree,Machpowersystems/spree_mach,softr8/spree,AgilTec/spree,jspizziri/spree,groundctrl/spree,woboinc/spree,madetech/spree,bonobos/solidus,rbngzlv/spree,KMikhaylovCTG/spree,keatonrow/spree,jeffboulet/spree,adaddeo/spree,siddharth28/spree,jsurdilla/solidus,dafontaine/spree,madetech/spree,azranel/spree,ckk-scratch/solidus,derekluo/spree,knuepwebdev/FloatTubeRodHolders,TrialGuides/spree,tancnle/spree,welitonfreitas/spree,FadliKun/spree,woboinc/spree,Kagetsuki/spree,Hates/spree,bjornlinder/Spree,pervino/spree,patdec/spree,pulkit21/spree,KMikhaylovCTG/spree,RatioClothing/spree