Before:
  let g:success = 0
  augroup VaderTest
    autocmd!
    autocmd User ALELint let g:success = 1
  augroup end

After:
  augroup! VaderTest
  let g:ale_buffer_info = {}

Given vim (Some vimscript):
  set nocompatible

Execute (Lint it):
  call ale#Lint()
  call ale#engine#WaitForJobs(2000)

Then (Autocommands should have run):
  AssertEqual g:success, 1