Before:
  Save g:ale_openscad_scadformat_executable
  Save g:ale_openscad_scadformat_options
  
  let g:ale_openscad_scadformat_executable = 'xxx'
  let g:ale_openscad_scadformat_options = ''

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

After:
  Restore

  call ale#test#RestoreDirectory()

Execute(scadformat - defaults OK):
  call ale#test#SetFilename('../test-files/openscad/dummy.scad')

  AssertEqual
  \ {
  \    'command': ale#Escape('xxx')
  \ },
  \ ale#fixers#scadformat#Fix(bufnr(''))