Before:
  call ale#assert#SetUpFixerTest('proto', 'protolint')
  call ale#test#SetFilename('test.proto')

After:
  call ale#assert#TearDownFixerTest()

Execute(The default command should be correct):
  AssertFixer
  \ {
  \   'command': ale#Escape('protolint')
  \     . ' -fix'
  \     . ' %t',
  \   'read_temporary_file': 1,
  \ }

Execute(The callback should include any additional options):
  let b:ale_proto_protolint_executable = '/tmp/protolint'
  let b:ale_proto_protolint_config = '/tmp/protolint.yaml'

  AssertFixer
  \ {
  \   'command': ale#Escape('/tmp/protolint')
  \     . ' -config_path=' . ale#Escape('/tmp/protolint.yaml')
  \     . ' -fix'
  \     . ' %t',
  \   'read_temporary_file': 1,
  \ }