Before:
  Save g:ale_ruby_syntax_tree_executable
  Save g:ale_ruby_syntax_tree_options

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

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

After:
  Restore

  call ale#test#RestoreDirectory()

Execute(The syntax_tree callback should return the correct default values):
  call ale#test#SetFilename('../test-files/ruby/dummy.rb')

  AssertEqual
  \ {
  \   'command': ale#Escape(g:ale_ruby_syntax_tree_executable)
  \     . ' format %t',
  \ },
  \ ale#fixers#syntax_tree#Fix(bufnr(''))

Execute(The syntax_tree callback should include custom options):
  let g:ale_ruby_syntax_tree_options = '--print-width=100 --plugins=plugin/trailing_comma'
  call ale#test#SetFilename('../test-files/ruby/with_config/dummy.rb')

  AssertEqual
  \ {
  \   'command': ale#Escape(g:ale_ruby_syntax_tree_executable)
  \     . ' format --print-width=100 --plugins=plugin/trailing_comma %t',
  \ },
  \ ale#fixers#syntax_tree#Fix(bufnr(''))