Before:
  Save g:ale_dhall_executable
  Save g:ale_dhall_options

  " Use an invalid global executable, so we don’t match it.
  let g:ale_dhall_executable = 'odd-dhall'
  let g:ale_dhall_options = '--ascii'
  let g:ale_dhall_freeze_options = '--all'

  call ale#assert#SetUpFixerTest('dhall-freeze', 'dhall-freeze')

After:
  call ale#assert#TearDownFixerTest()

Execute(The dhall-freeze callback should return the correct options):
  AssertFixer
  \ {
  \   'command': ale#Escape('odd-dhall')
  \     . ' --ascii'
  \     . ' freeze'
  \     . ' --all'
  \     . ' --inplace %t',
  \   'read_temporary_file': 1,
  \ }