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

After:
  call ale#test#RestoreDirectory()

Execute(The executable path should be correct):
  call ale#test#SetFilename('../eslint-test-files/react-app/subdir/testfile.js')

  AssertEqual
  \ {
  \   'read_temporary_file': 1,
  \   'command': (has('win32') ? 'node.exe ' : '')
  \     . ale#Escape(ale#path#Simplify(g:dir . '/../eslint-test-files/react-app/node_modules/standard/bin/cmd.js'))
  \     . ' --fix %t',
  \ },
  \ ale#fixers#standard#Fix(bufnr(''))