node tests: Add reactions.js test module.
node tests: Add reactions.js test module.

We test get_message_reactions() in our first test here.

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