Execute ( SpaceVim api: unicode#tree ):
  let box = SpaceVim#api#import('unicode#box')
  AssertEqual box.drawing_box([1,2,3] , 1, 3, 5),
    \ [
    \ '╭─────┬─────┬─────╮',
    \ '│  1  │  2  │  3  │',
    \ '╰─────┴─────┴─────╯'
    \ ]