Add Google OAuth2 backend tests.
Add Google OAuth2 backend tests.

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