Before:
  call ale#assert#SetUpFixerTest('lua', 'stylua')

After:
  call ale#assert#TearDownFixerTest()

Execute(The default command should be correct):
  AssertFixer {'command': ale#Escape('stylua') . ' -'}

Execute(The stylua callback should include custom stylua options):
  let g:ale_lua_stylua_executable = 'xxxinvalid'
  let g:ale_lua_stylua_options = '--search-parent-directories'

  AssertFixer
  \ {
  \   'command': ale#Escape('xxxinvalid')
  \     . ' ' . g:ale_lua_stylua_options
  \     . ' -',
  \ }