[test] Use tmux buffer in unicode test cases
[test] Use tmux buffer in unicode test cases

Related #616

tomfitzhenry/pkg-fzf,qiemem/fzf,infokiller/fzf,stuha/wbr-zsh,wilywampa/fzf,infokiller/fzf,janlazo/fzf,qiemem/fzf,janlazo/fzf,wilywampa/fzf,wilywampa/fzf,junegunn/fzf,junegunn/fzf,infokiller/fzf,lululau/fzf,lululau/fzf,qiemem/fzf,tomfitzhenry/pkg-fzf,lululau/fzf,tomfitzhenry/pkg-fzf,junegunn/fzf,janlazo/fzf