Before:
  call ale#assert#SetUpFixerTest('css', 'css-beautify', 'beautify')

After:
  Restore

  call ale#assert#TearDownFixerTest()

Execute(The css-beautify callback should return the correct default command):
  AssertEqual
  \ {'command': ale#Escape('css-beautify') . '  -'},
  \ ale#fixers#css_beautify#Fix(bufnr(''))
