Sample mailbox delivery code for Ruby Off Rails

message.rb

class Message

	def deliver_to(mailbox)
		mailbox.new_mail(self)
	end
end

class Mailbox

	def initialize
		@flag_raised = false
	end

	def new_mail(mail)
		@flag_raised = true
	end

	def flag_raised?
		@flag_raised
	end
end

describe Message do
	it "should tell the mailbox about itself" do	
		mailbox = mock
		message = Message.new
		mailbox.should_receive(:new_mail).with(message)
		message.deliver_to(mailbox)
	end
end

describe Mailbox do
	it "should not be raised by default" do
		Mailbox.new.flag_raised?.should eq(false)
	end
	describe "#new_mail" do
		it "should raise the flag" do
			mailbox = Mailbox.new
			mailbox.new_mail(stub)
			mailbox.flag_raised?.should be_true
		end
	end
end