Before:
  Save g:ale_lua_luafmt_executable
  Save g:ale_lua_luafmt_options

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

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

After:
  Restore

  call ale#test#RestoreDirectory()

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

  AssertEqual
  \ {
  \   'command': ale#Escape('xxxinvalid') . ' --stdin',
  \ },
  \ ale#fixers#luafmt#Fix(bufnr(''))

Execute(The luafmt callback should include custom luafmt options):
  let g:ale_lua_luafmt_options = "--skip-children"
  call ale#test#SetFilename('../test-files/lua/testfile.lua')

  AssertEqual
  \ {
  \   'command': ale#Escape('xxxinvalid')
  \     . ' ' . g:ale_lua_luafmt_options
  \     . ' --stdin',
  \ },
  \ ale#fixers#luafmt#Fix(bufnr(''))