Add tests for zerver/lib/sessions.py.
Add tests for zerver/lib/sessions.py.

brainwane/zulip,tommyip/zulip,timabbott/zulip,kou/zulip,ryanbackman/zulip,tommyip/zulip,j831/zulip,rishig/zulip,showell/zulip,eeshangarg/zulip,synicalsyntax/zulip,amanharitsh123/zulip,verma-varsha/zulip,timabbott/zulip,mahim97/zulip,christi3k/zulip,christi3k/zulip,amanharitsh123/zulip,ryanbackman/zulip,synicalsyntax/zulip,showell/zulip,tommyip/zulip,rishig/zulip,hackerkid/zulip,amanharitsh123/zulip,brainwane/zulip,kou/zulip,jrowan/zulip,Galexrt/zulip,andersk/zulip,hackerkid/zulip,kou/zulip,eeshangarg/zulip,zulip/zulip,rht/zulip,jackrzhang/zulip,andersk/zulip,christi3k/zulip,brockwhittaker/zulip,tommyip/zulip,jackrzhang/zulip,dhcrzf/zulip,vaidap/zulip,zulip/zulip,hackerkid/zulip,rht/zulip,rishig/zulip,j831/zulip,j831/zulip,amanharitsh123/zulip,hackerkid/zulip,jphilipsen05/zulip,j831/zulip,rishig/zulip,shubhamdhama/zulip,synicalsyntax/zulip,brockwhittaker/zulip,tommyip/zulip,andersk/zulip,dhcrzf/zulip,j831/zulip,jackrzhang/zulip,showell/zulip,vaidap/zulip,timabbott/zulip,Galexrt/zulip,rht/zulip,hackerkid/zulip,showell/zulip,timabbott/zulip,christi3k/zulip,jphilipsen05/zulip,eeshangarg/zulip,vaidap/zulip,eeshangarg/zulip,brainwane/zulip,jackrzhang/zulip,kou/zulip,jrowan/zulip,brainwane/zulip,dhcrzf/zulip,andersk/zulip,mahim97/zulip,eeshangarg/zulip,eeshangarg/zulip,timabbott/zulip,synicalsyntax/zulip,synicalsyntax/zulip,ryanbackman/zulip,mahim97/zulip,brockwhittaker/zulip,showell/zulip,amanharitsh123/zulip,brainwane/zulip,shubhamdhama/zulip,shubhamdhama/zulip,showell/zulip,brockwhittaker/zulip,shubhamdhama/zulip,andersk/zulip,jphilipsen05/zulip,Galexrt/zulip,rht/zulip,brainwane/zulip,zulip/zulip,punchagan/zulip,j831/zulip,andersk/zulip,amanharitsh123/zulip,brockwhittaker/zulip,vabs22/zulip,rishig/zulip,Galexrt/zulip,verma-varsha/zulip,dhcrzf/zulip,Galexrt/zulip,andersk/zulip,synicalsyntax/zulip,verma-varsha/zulip,ryanbackman/zulip,vabs22/zulip,kou/zulip,ryanbackman/zulip,shubhamdhama/zulip,zulip/zulip,vaidap/zulip,timabbott/zulip,showell/zulip,vabs22/zulip,jrowan/zulip,christi3k/zulip,rishig/zulip,jphilipsen05/zulip,punchagan/zulip,christi3k/zulip,zulip/zulip,dhcrzf/zulip,verma-varsha/zulip,brockwhittaker/zulip,jphilipsen05/zulip,tommyip/zulip,synicalsyntax/zulip,jphilipsen05/zulip,jrowan/zulip,zulip/zulip,shubhamdhama/zulip,brainwane/zulip,timabbott/zulip,eeshangarg/zulip,jrowan/zulip,jackrzhang/zulip,vabs22/zulip,punchagan/zulip,jackrzhang/zulip,kou/zulip,shubhamdhama/zulip,punchagan/zulip,vaidap/zulip,Galexrt/zulip,dhcrzf/zulip,vabs22/zulip,vabs22/zulip,dhcrzf/zulip,vaidap/zulip,ryanbackman/zulip,punchagan/zulip,Galexrt/zulip,verma-varsha/zulip,zulip/zulip,rishig/zulip,jackrzhang/zulip,rht/zulip,tommyip/zulip,punchagan/zulip,mahim97/zulip,hackerkid/zulip,mahim97/zulip,mahim97/zulip,verma-varsha/zulip,rht/zulip,kou/zulip,jrowan/zulip,rht/zulip,hackerkid/zulip,punchagan/zulip