shared_examples_for "all parsedfile providers" do |provider, *files|
  if files.empty? then
    files = my_fixtures
  end

  files.flatten.each do |file|
    it "should rewrite #{file} reasonably unchanged" do
      provider.stubs(:default_target).returns(file)
      provider.prefetch

      text = provider.to_file(provider.target_records(file))
      text.gsub!(/^# HEADER.+\n/, '')

      oldlines = File.readlines(file)
      newlines = text.chomp.split "\n"
      oldlines.zip(newlines).each do |old, new|
        new.gsub(/\s+/, '').should == old.chomp.gsub(/\s+/, '')
      end
    end
  end
end