Add missing assertion in demo dir test
Add missing assertion in demo dir test

arvidsaur/cli,zabawaba99/cli,yeah-right/cli,arvidsaur/cli,lcowell/cli,lcowell/cli,arvidsaur/cli,exercism/cli,Tonkpils/cli,yeah-right/cli,zabawaba99/cli,Tonkpils/cli,neslom/cli,exercism/cli,Tonkpils/cli,neslom/cli,neslom/cli,yeah-right/cli,zabawaba99/cli,lcowell/cli