Before:
  Save g:ale_ocaml_dune_executable
  Save g:ale_ocaml_dune_options

  " Use an invalid global executable, so we don't match it.
  let g:ale_ocaml_dune_executable = 'xxxinvalid'
  let g:ale_ocaml_dune_options = ''

  call ale#test#SetDirectory('/testplugin/test/fixers')

After:
  Restore

  call ale#test#RestoreDirectory()

Execute(The dune callback should return the correct default values):
  call ale#test#SetFilename('../test-files/ocaml/testfile.re')

  AssertEqual
  \ {
  \   'command': ale#Escape('xxxinvalid')
  \     . ' format',
  \ },
  \ ale#fixers#dune#Fix(bufnr(''))

Execute(The dune callback should include custom dune options):
  let g:ale_ocaml_dune_options = "--random-option"
  call ale#test#SetFilename('../test-files/ocaml/testfile.re')

  AssertEqual
  \ {
  \   'command': ale#Escape('xxxinvalid')
  \     . ' format'
  \     . ' ' . g:ale_ocaml_dune_options,
  \ },
  \ ale#fixers#dune#Fix(bufnr(''))