def describe_private *args, &block
  example = describe *args, &block
  klass = args[0]
  if klass.is_a? Class
    saved_private_instance_methods = klass.private_instance_methods
    example.before do
      klass.class_eval { public *saved_private_instance_methods }
    end
    example.after do
      klass.class_eval { private *saved_private_instance_methods }
    end
  end
end