Execute ( SpaceVim api: unicode#tree ):
  let box = SpaceVim#api#import('unicode#tree')
  AssertEqual box.drawing_tree({'test' : [{'hello' : ['one', 'two']},'world']}),
    \ [
    \ 'test',
    \ '  ├hello',
    \ '  │  ├one',
    \ '  │  ╰two',
    \ '  ╰world',
    \ ]