Before:
  Save g:ale_set_signs
  let g:ale_set_signs = 1

  let g:expected_data = [
  \ {
  \   'lnum': 1,
  \   'bufnr': bufnr('%'),
  \   'vcol': 0,
  \   'linter_name': 'testlinter',
  \   'nr': -1,
  \   'type': 'W',
  \   'col': 10,
  \   'text': 'Infix operators must be spaced. [Warning/space-infix-ops]',
  \   'sign_id': 1000001,
  \ },
  \ {
  \   'lnum': 2,
  \   'bufnr': bufnr('%'),
  \   'vcol': 0,
  \   'linter_name': 'testlinter',
  \   'nr': -1,
  \   'type': 'E',
  \   'col': 10,
  \   'text': 'Missing semicolon. [Error/semi]',
  \   'sign_id': 1000002,
  \ }
  \]

  function! TestCallback(buffer, output)
    return [
    \ {
    \   'lnum': 1,
    \   'type': 'W',
    \   'col': 10,
    \   'text': 'Infix operators must be spaced. [Warning/space-infix-ops]',
    \ },
    \ {
    \   'lnum': 2,
    \   'type': 'E',
    \   'col': 10,
    \   'text': 'Missing semicolon. [Error/semi]',
    \ }
    \]
  endfunction

  call ale#linter#Define('foobar', {
  \ 'name': 'testlinter',
  \ 'callback': 'TestCallback',
  \ 'executable': has('win32') ? 'cmd': 'true',
  \ 'command': 'true',
  \ 'read_buffer': 0,
  \})

  sign unplace *

After:
  Restore

  delfunction TestCallback

  unlet! g:expected_data
  let g:ale_buffer_info = {}
  call ale#linter#Reset()

Given foobar (Some JavaScript with problems):
  var y = 3+3;
  var y = 3

Execute(The loclist should be updated after linting is done):
  call ale#Lint()
  call ale#engine#WaitForJobs(2000)

  AssertEqual ['' . bufnr('%')], keys(g:ale_buffer_info)
  AssertEqual g:expected_data, g:ale_buffer_info[bufnr('%')].loclist