Add test_create_user_backend().
Add test_create_user_backend().

This tests provides full line coverage on the
create_user_backend view.

AZtheAsian/zulip,Diptanshu8/zulip,TigorC/zulip,shubhamdhama/zulip,paxapy/zulip,sup95/zulip,brainwane/zulip,mahim97/zulip,j831/zulip,rishig/zulip,vikas-parashar/zulip,vikas-parashar/zulip,eeshangarg/zulip,tommyip/zulip,jackrzhang/zulip,mohsenSy/zulip,brainwane/zulip,rht/zulip,dhcrzf/zulip,hackerkid/zulip,SmartPeople/zulip,andersk/zulip,ryanbackman/zulip,Diptanshu8/zulip,niftynei/zulip,peguin40/zulip,dhcrzf/zulip,AZtheAsian/zulip,PhilSk/zulip,brockwhittaker/zulip,mahim97/zulip,samatdav/zulip,j831/zulip,vikas-parashar/zulip,sup95/zulip,mahim97/zulip,dattatreya303/zulip,kou/zulip,dattatreya303/zulip,shubhamdhama/zulip,rht/zulip,AZtheAsian/zulip,andersk/zulip,zacps/zulip,showell/zulip,TigorC/zulip,KingxBanana/zulip,synicalsyntax/zulip,Juanvulcano/zulip,PhilSk/zulip,hackerkid/zulip,mohsenSy/zulip,KingxBanana/zulip,brockwhittaker/zulip,shubhamdhama/zulip,cosmicAsymmetry/zulip,shubhamdhama/zulip,Juanvulcano/zulip,sharmaeklavya2/zulip,AZtheAsian/zulip,blaze225/zulip,vabs22/zulip,Diptanshu8/zulip,punchagan/zulip,isht3/zulip,samatdav/zulip,arpith/zulip,christi3k/zulip,paxapy/zulip,souravbadami/zulip,calvinleenyc/zulip,amanharitsh123/zulip,mohsenSy/zulip,punchagan/zulip,sonali0901/zulip,Jianchun1/zulip,sup95/zulip,blaze225/zulip,cosmicAsymmetry/zulip,punchagan/zulip,brainwane/zulip,calvinleenyc/zulip,j831/zulip,dawran6/zulip,tommyip/zulip,jainayush975/zulip,krtkmj/zulip,sup95/zulip,dawran6/zulip,SmartPeople/zulip,brainwane/zulip,jrowan/zulip,vaidap/zulip,synicalsyntax/zulip,timabbott/zulip,JPJPJPOPOP/zulip,isht3/zulip,JPJPJPOPOP/zulip,vaidap/zulip,christi3k/zulip,amyliu345/zulip,cosmicAsymmetry/zulip,jrowan/zulip,isht3/zulip,zacps/zulip,rht/zulip,paxapy/zulip,dawran6/zulip,showell/zulip,reyha/zulip,blaze225/zulip,hackerkid/zulip,brainwane/zulip,vikas-parashar/zulip,susansls/zulip,zacps/zulip,vaidap/zulip,umkay/zulip,eeshangarg/zulip,brainwane/zulip,verma-varsha/zulip,paxapy/zulip,TigorC/zulip,krtkmj/zulip,jainayush975/zulip,samatdav/zulip,mahim97/zulip,rishig/zulip,mahim97/zulip,sharmaeklavya2/zulip,souravbadami/zulip,KingxBanana/zulip,showell/zulip,peguin40/zulip,zulip/zulip,dhcrzf/zulip,JPJPJPOPOP/zulip,grave-w-grave/zulip,niftynei/zulip,dawran6/zulip,susansls/zulip,peguin40/zulip,krtkmj/zulip,Galexrt/zulip,KingxBanana/zulip,krtkmj/zulip,grave-w-grave/zulip,Jianchun1/zulip,punchagan/zulip,andersk/zulip,Jianchun1/zulip,synicalsyntax/zulip,arpith/zulip,vaidap/zulip,vaidap/zulip,tommyip/zulip,Galexrt/zulip,dattatreya303/zulip,ahmadassaf/zulip,arpith/zulip,kou/zulip,punchagan/zulip,Juanvulcano/zulip,synicalsyntax/zulip,rishig/zulip,SmartPeople/zulip,mohsenSy/zulip,verma-varsha/zulip,reyha/zulip,vabs22/zulip,PhilSk/zulip,dattatreya303/zulip,dattatreya303/zulip,j831/zulip,susansls/zulip,rht/zulip,showell/zulip,SmartPeople/zulip,blaze225/zulip,cosmicAsymmetry/zulip,reyha/zulip,niftynei/zulip,synicalsyntax/zulip,verma-varsha/zulip,andersk/zulip,samatdav/zulip,christi3k/zulip,souravbadami/zulip,aakash-cr7/zulip,amyliu345/zulip,PhilSk/zulip,jphilipsen05/zulip,amyliu345/zulip,hackerkid/zulip,calvinleenyc/zulip,eeshangarg/zulip,sup95/zulip,krtkmj/zulip,synicalsyntax/zulip,AZtheAsian/zulip,mohsenSy/zulip,Galexrt/zulip,Juanvulcano/zulip,kou/zulip,verma-varsha/zulip,andersk/zulip,showell/zulip,jackrzhang/zulip,isht3/zulip,zulip/zulip,TigorC/zulip,eeshangarg/zulip,zulip/zulip,brockwhittaker/zulip,zulip/zulip,AZtheAsian/zulip,vabs22/zulip,rishig/zulip,showell/zulip,Galexrt/zulip,zulip/zulip,amyliu345/zulip,dattatreya303/zulip,kou/zulip,eeshangarg/zulip,brockwhittaker/zulip,kou/zulip,aakash-cr7/zulip,dhcrzf/zulip,joyhchen/zulip,aakash-cr7/zulip,jphilipsen05/zulip,zacps/zulip,SmartPeople/zulip,vabs22/zulip,sharmaeklavya2/zulip,cosmicAsymmetry/zulip,Galexrt/zulip,hackerkid/zulip,JPJPJPOPOP/zulip,verma-varsha/zulip,amyliu345/zulip,jackrzhang/zulip,christi3k/zulip,mohsenSy/zulip,timabbott/zulip,dhcrzf/zulip,PhilSk/zulip,jphilipsen05/zulip,jainayush975/zulip,christi3k/zulip,Jianchun1/zulip,sonali0901/zulip,Jianchun1/zulip,zacps/zulip,Diptanshu8/zulip,susansls/zulip,Diptanshu8/zulip,joyhchen/zulip,JPJPJPOPOP/zulip,dawran6/zulip,hackerkid/zulip,sonali0901/zulip,ahmadassaf/zulip,brockwhittaker/zulip,andersk/zulip,j831/zulip,joyhchen/zulip,peguin40/zulip,samatdav/zulip,punchagan/zulip,dawran6/zulip,hackerkid/zulip,eeshangarg/zulip,ryanbackman/zulip,cosmicAsymmetry/zulip,jphilipsen05/zulip,arpith/zulip,vabs22/zulip,ahmadassaf/zulip,niftynei/zulip,sonali0901/zulip,KingxBanana/zulip,jackrzhang/zulip,isht3/zulip,ahmadassaf/zulip,sonali0901/zulip,krtkmj/zulip,joyhchen/zulip,calvinleenyc/zulip,ryanbackman/zulip,timabbott/zulip,Galexrt/zulip,paxapy/zulip,shubhamdhama/zulip,susansls/zulip,SmartPeople/zulip,blaze225/zulip,andersk/zulip,KingxBanana/zulip,jrowan/zulip,eeshangarg/zulip,brockwhittaker/zulip,ryanbackman/zulip,tommyip/zulip,Jianchun1/zulip,sup95/zulip,ryanbackman/zulip,amanharitsh123/zulip,kou/zulip,joyhchen/zulip,Juanvulcano/zulip,rishig/zulip,sharmaeklavya2/zulip,ahmadassaf/zulip,ahmadassaf/zulip,jainayush975/zulip,niftynei/zulip,timabbott/zulip,souravbadami/zulip,j831/zulip,amanharitsh123/zulip,ahmadassaf/zulip,jackrzhang/zulip,souravbadami/zulip,jainayush975/zulip,dhcrzf/zulip,samatdav/zulip,TigorC/zulip,arpith/zulip,rht/zulip,verma-varsha/zulip,vaidap/zulip,timabbott/zulip,grave-w-grave/zulip,grave-w-grave/zulip,umkay/zulip,jackrzhang/zulip,aakash-cr7/zulip,brainwane/zulip,shubhamdhama/zulip,calvinleenyc/zulip,vikas-parashar/zulip,krtkmj/zulip,jainayush975/zulip,ryanbackman/zulip,niftynei/zulip,Juanvulcano/zulip,souravbadami/zulip,calvinleenyc/zulip,zacps/zulip,jrowan/zulip,christi3k/zulip,rht/zulip,rht/zulip,umkay/zulip,dhcrzf/zulip,peguin40/zulip,isht3/zulip,susansls/zulip,mahim97/zulip,amanharitsh123/zulip,vabs22/zulip,rishig/zulip,jrowan/zulip,punchagan/zulip,Galexrt/zulip,umkay/zulip,peguin40/zulip,arpith/zulip,tommyip/zulip,synicalsyntax/zulip,aakash-cr7/zulip,umkay/zulip,showell/zulip,grave-w-grave/zulip,grave-w-grave/zulip,jrowan/zulip,sharmaeklavya2/zulip,tommyip/zulip,umkay/zulip,kou/zulip,aakash-cr7/zulip,TigorC/zulip,JPJPJPOPOP/zulip,amanharitsh123/zulip,blaze225/zulip,reyha/zulip,sonali0901/zulip,zulip/zulip,joyhchen/zulip,jphilipsen05/zulip,umkay/zulip,jackrzhang/zulip,amyliu345/zulip,shubhamdhama/zulip,Diptanshu8/zulip,timabbott/zulip,reyha/zulip,tommyip/zulip,amanharitsh123/zulip,vikas-parashar/zulip,paxapy/zulip,jphilipsen05/zulip,rishig/zulip,zulip/zulip,sharmaeklavya2/zulip,PhilSk/zulip,reyha/zulip,timabbott/zulip