Before:
  call ale#assert#SetUpFixerTest('tex', 'tex-fmt')

After:
  Restore

  call ale#assert#TearDownFixerTest()

Execute(The tex-fmt callback should return the correct default command):
  AssertEqual
  \ {'command': ale#Escape('tex-fmt') . '  -s'},
  \ ale#fixers#tex_fmt#Fix(bufnr(''))