Setting the flash in view helper tests

Hello all,

I am trying to find a way to set the flash for a view helper test. The
purpose of my view helper is to simplify rendering of flash messages,
and I'd like to be able to test it by passing a mocked flash object to
the helper method in my tests. I'm not quite sure how to do this,
perhaps by mocking somehow?

Here was my first attempt that did not work:

context "flash_messages" do
  setup do
    @flash = { :notice => "A notification message }
    @result = flash_messages
  end

  ...
end