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

After:
  augroup! VaderTest

Given vim (Vimscript):
  set nocompatible
Execute (Run ALE):
  call ale#Lint()
  call ale#engine#WaitForJobs(2000)
Then (Autocommand should have run):
  AssertEqual g:success, 1