Execute ( SpaceVim api: unicode#icon ):
  let &encoding = 'utf-8'
  let icon = SpaceVim#api#import('unicode#icon')
  AssertEqual icon.battery_status(90), ''
  AssertEqual icon.battery_status(75), ''
  AssertEqual icon.battery_status(50), ''
  AssertEqual icon.battery_status(25), ''
  AssertEqual icon.battery_status(10), ''