Before:
  let g:complete_post_triggered = 0

  augroup VaderTest
    autocmd!
    autocmd User ALECompletePost let g:complete_post_triggered = 1
  augroup END

After:
  unlet! b:ale_completion_info
  unlet! g:complete_post_triggered

  augroup VaderTest
    autocmd!
  augroup END

  augroup! VaderTest

Execute(ALECompletePost should not be triggered when completion is cancelled):
  call ale#completion#HandleUserData({})

  Assert !g:complete_post_triggered

Execute(ALECompletePost should not be triggered when tools other than ALE insert completions):
  call ale#completion#HandleUserData({'user_data': ''})
  call ale#completion#HandleUserData({'user_data': '{}'})

  Assert !g:complete_post_triggered

Execute(ALECompletePost should be triggered when ALE inserts completions):
  call ale#completion#HandleUserData({
  \ 'user_data': json_encode({'_ale_completion_item': 1}),
  \})

  Assert g:complete_post_triggered