Before:
  Save g:ale_python_black_executable
  Save g:ale_python_black_options

  " Use an invalid global executable, so we don't match it.
  let g:ale_python_black_executable = 'xxxinvalid'
  let g:ale_python_black_options = ''

  call ale#test#SetDirectory('/testplugin/test/fixers')
  silent cd ..
  silent cd command_callback
  let g:dir = getcwd()

  let b:bin_dir = has('win32') ? 'Scripts' : 'bin'

After:
  Restore

  unlet! b:bin_dir

  call ale#test#RestoreDirectory()

Execute(The black callback should return the correct default values):
  AssertEqual
  \ 0,
  \ ale#fixers#black#Fix(bufnr(''))

  silent execute 'file ' . fnameescape(g:dir . '/python_paths/with_virtualenv/subdir/foo/bar.py')
  AssertEqual
  \ {'command': ale#Escape(ale#path#Simplify(g:dir . '/python_paths/with_virtualenv/env/' . b:bin_dir . '/black')) . ' -'},
  \ ale#fixers#black#Fix(bufnr(''))

Execute(The black callback should include options):
  let g:ale_python_black_options = '--some-option'

  silent execute 'file ' . fnameescape(g:dir . '/python_paths/with_virtualenv/subdir/foo/bar.py')
  AssertEqual
  \ {'command': ale#Escape(ale#path#Simplify(g:dir . '/python_paths/with_virtualenv/env/' . b:bin_dir . '/black')) . ' --some-option -' },
  \ ale#fixers#black#Fix(bufnr(''))