compose.js: Add coverage for validate_stream_message() function.
compose.js: Add coverage for validate_stream_message() function.

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