class Autotest

def reorder files_to_test
  case self.order
  when :alpha then
    files_to_test.sort_by { |k,v| k }
  when :reverse then
    files_to_test.sort_by { |k,v| k }.reverse
  when :random then
    max = files_to_test.size
    files_to_test.sort_by { |k,v| rand(max) }
  when :natural then
    (self.find_order & files_to_test.keys).map { |f| [f, files_to_test[f]] }
  else
    raise "unknown order type: #{self.order.inspect}"
  end
end