module Shoulda::ActionController::Matchers

it { should_not set_the_flash }
it { should set_the_flash.to(/created/i) }
it { should set_the_flash.to("Thank you for placing this order.") }
it { should set_the_flash }

Example:

Regexp, or nil (indicating that the flash should not be set).
Ensures that the flash contains the given value. Can be a String, a

def set_the_flash
  SetTheFlashMatcher.new
end