Before:
  Save g:ale_dart_format_executable
  Save g:ale_dart_format_options

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

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

After:
  Restore

  call ale#test#RestoreDirectory()

Execute(The dart format callback should return the correct default values):
  call ale#test#SetFilename('../test-files/dart/testfile.dart')

  AssertEqual
  \ {
  \   'read_temporary_file': 1,
  \   'command': ale#Escape('xxxinvalid')
  \     . ' format'
  \     . ' %t',
  \ },
  \ ale#fixers#dart_format#Fix(bufnr(''))

Execute(The dart format callback should include custom dart format options):
  let g:ale_dart_format_options = "-l 80"
  call ale#test#SetFilename('../test-files/dart/testfile.dart')

  AssertEqual
  \ {
  \   'read_temporary_file': 1,
  \   'command': ale#Escape('xxxinvalid')
  \     . ' format'
  \     . ' ' . g:ale_dart_format_options
  \     . ' %t',
  \ },
  \ ale#fixers#dart_format#Fix(bufnr(''))