Before:
  let g:ale_buffer_info = {}

After:
  call ale#engine#Cleanup(bufnr(''))

  let g:ale_buffer_info = {}

Given unite (A Unite.vim file):
  anything

Execute(Running ALE on a blacklisted file shouldn't change anything):
  call ale#Queue(0)
  call ale#test#WaitForJobs(2000)

  AssertEqual {}, g:ale_buffer_info