Add compose_fade unit tests.
Add compose_fade unit tests.

dhcrzf/zulip,vaidap/zulip,brockwhittaker/zulip,kou/zulip,rishig/zulip,aakash-cr7/zulip,shubhamdhama/zulip,dattatreya303/zulip,souravbadami/zulip,hackerkid/zulip,vaidap/zulip,mahim97/zulip,hackerkid/zulip,vabs22/zulip,PhilSk/zulip,rishig/zulip,blaze225/zulip,jackrzhang/zulip,blaze225/zulip,punchagan/zulip,mahim97/zulip,susansls/zulip,shubhamdhama/zulip,vabs22/zulip,andersk/zulip,SmartPeople/zulip,synicalsyntax/zulip,aakash-cr7/zulip,brockwhittaker/zulip,jackrzhang/zulip,aakash-cr7/zulip,tommyip/zulip,susansls/zulip,brockwhittaker/zulip,amanharitsh123/zulip,susansls/zulip,brockwhittaker/zulip,zulip/zulip,dattatreya303/zulip,rht/zulip,shubhamdhama/zulip,dattatreya303/zulip,dawran6/zulip,verma-varsha/zulip,christi3k/zulip,eeshangarg/zulip,jackrzhang/zulip,jphilipsen05/zulip,tommyip/zulip,rht/zulip,vaidap/zulip,verma-varsha/zulip,brainwane/zulip,rht/zulip,PhilSk/zulip,zulip/zulip,vaidap/zulip,mahim97/zulip,brainwane/zulip,vabs22/zulip,JPJPJPOPOP/zulip,rishig/zulip,showell/zulip,ryanbackman/zulip,brainwane/zulip,punchagan/zulip,synicalsyntax/zulip,jrowan/zulip,jackrzhang/zulip,ryanbackman/zulip,PhilSk/zulip,dhcrzf/zulip,brainwane/zulip,rishig/zulip,zulip/zulip,jackrzhang/zulip,jrowan/zulip,souravbadami/zulip,susansls/zulip,PhilSk/zulip,JPJPJPOPOP/zulip,PhilSk/zulip,tommyip/zulip,amanharitsh123/zulip,souravbadami/zulip,rht/zulip,ryanbackman/zulip,andersk/zulip,christi3k/zulip,samatdav/zulip,aakash-cr7/zulip,samatdav/zulip,dattatreya303/zulip,dattatreya303/zulip,christi3k/zulip,ryanbackman/zulip,dawran6/zulip,jainayush975/zulip,vaidap/zulip,jphilipsen05/zulip,rht/zulip,jrowan/zulip,JPJPJPOPOP/zulip,zulip/zulip,andersk/zulip,rht/zulip,synicalsyntax/zulip,showell/zulip,jphilipsen05/zulip,showell/zulip,amanharitsh123/zulip,dhcrzf/zulip,amanharitsh123/zulip,hackerkid/zulip,SmartPeople/zulip,amanharitsh123/zulip,verma-varsha/zulip,synicalsyntax/zulip,Galexrt/zulip,christi3k/zulip,souravbadami/zulip,jainayush975/zulip,susansls/zulip,eeshangarg/zulip,vabs22/zulip,samatdav/zulip,JPJPJPOPOP/zulip,dhcrzf/zulip,jackrzhang/zulip,blaze225/zulip,christi3k/zulip,showell/zulip,rishig/zulip,dhcrzf/zulip,jphilipsen05/zulip,JPJPJPOPOP/zulip,showell/zulip,timabbott/zulip,dhcrzf/zulip,kou/zulip,j831/zulip,timabbott/zulip,amanharitsh123/zulip,punchagan/zulip,JPJPJPOPOP/zulip,christi3k/zulip,jainayush975/zulip,dawran6/zulip,brockwhittaker/zulip,jrowan/zulip,verma-varsha/zulip,jrowan/zulip,susansls/zulip,shubhamdhama/zulip,SmartPeople/zulip,kou/zulip,ryanbackman/zulip,jainayush975/zulip,verma-varsha/zulip,zulip/zulip,shubhamdhama/zulip,jackrzhang/zulip,mahim97/zulip,tommyip/zulip,andersk/zulip,showell/zulip,brainwane/zulip,samatdav/zulip,dhcrzf/zulip,timabbott/zulip,blaze225/zulip,dawran6/zulip,j831/zulip,tommyip/zulip,jphilipsen05/zulip,dawran6/zulip,punchagan/zulip,mahim97/zulip,brainwane/zulip,zulip/zulip,Galexrt/zulip,hackerkid/zulip,punchagan/zulip,rht/zulip,Galexrt/zulip,jrowan/zulip,jainayush975/zulip,timabbott/zulip,kou/zulip,eeshangarg/zulip,aakash-cr7/zulip,timabbott/zulip,tommyip/zulip,shubhamdhama/zulip,synicalsyntax/zulip,andersk/zulip,aakash-cr7/zulip,brainwane/zulip,dawran6/zulip,souravbadami/zulip,hackerkid/zulip,vabs22/zulip,dattatreya303/zulip,samatdav/zulip,punchagan/zulip,j831/zulip,eeshangarg/zulip,j831/zulip,jphilipsen05/zulip,souravbadami/zulip,verma-varsha/zulip,SmartPeople/zulip,zulip/zulip,j831/zulip,punchagan/zulip,kou/zulip,vabs22/zulip,rishig/zulip,PhilSk/zulip,eeshangarg/zulip,brockwhittaker/zulip,kou/zulip,hackerkid/zulip,SmartPeople/zulip,ryanbackman/zulip,rishig/zulip,Galexrt/zulip,timabbott/zulip,mahim97/zulip,eeshangarg/zulip,synicalsyntax/zulip,hackerkid/zulip,showell/zulip,Galexrt/zulip,Galexrt/zulip,jainayush975/zulip,blaze225/zulip,andersk/zulip,kou/zulip,vaidap/zulip,SmartPeople/zulip,j831/zulip,eeshangarg/zulip,tommyip/zulip,blaze225/zulip,shubhamdhama/zulip,synicalsyntax/zulip,andersk/zulip,Galexrt/zulip,timabbott/zulip,samatdav/zulip