Before:
  Save g:ale_d_dfmt_executable
  Save g:ale_d_dfmt_options

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

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

After:
  Restore

  call ale#test#RestoreDirectory()

Execute(The dfmt callback should return the correct default values):
  call ale#test#SetFilename('../d_files/test.d')

  AssertEqual
  \ {
  \   'read_temporary_file': 1,
  \   'command': ale#Escape('xxxinvalid')
  \     . ' -i'
  \     . ' %t',
  \ },
  \ ale#fixers#dfmt#Fix(bufnr(''))

Execute(The dfmt callback should include custom dfmt options):
  let g:ale_d_dfmt_options = "--space-after-cast"
  call ale#test#SetFilename('../d_files/test.d')

  AssertEqual
  \ {
  \   'read_temporary_file': 1,
  \   'command': ale#Escape('xxxinvalid')
  \     . ' -i'
  \     . ' ' . g:ale_d_dfmt_options
  \     . ' %t',
  \ },
  \ ale#fixers#dfmt#Fix(bufnr(''))