Before:
  call ale#assert#SetUpFixerTest('nim', 'nimpretty')

After:
  call ale#test#RestoreDirectory()

Execute(The nimpretty callback should return the correct default values):

  AssertEqual
  \ {
  \   'read_temporary_file': 1,
  \   'command': ale#Escape(g:ale_nim_nimpretty_executable)
  \     . ' %t --maxLineLen:80'
  \ },
  \ ale#fixers#nimpretty#Fix(bufnr(''))

Execute(The nimpretty callback should include any additional options):
  let g:ale_nim_nimpretty_options = '--some-option'

  AssertEqual
  \ {
  \   'read_temporary_file': 1,
  \   'command': ale#Escape(g:ale_nim_nimpretty_executable)
  \     . ' %t'
  \     . ' --some-option',
  \ },
  \ ale#fixers#nimpretty#Fix(bufnr(''))