Create a Functional Test for Session Controller

Does anybody know how to make a functional test for this controller :

  def create
    user = User.authenticate(params[:email], params[:password])
    if user
      session[:user_id] = user.id
      redirect_to root_url, :notice => "Logged in!"
    else
      flash.now.alert = "Invalid email or password"
      render "new"
    end
  end

  def destroy
    session[:user_id] = nil
    redirect_to root_url, :notice => "Logged out!"
  end

I am so confused, because i am a newbie to ROR, please help me,
(urgent!)

Have you worked right through a good tutorial such as
railstutorial.org (which is free to use online)? This includes a good
introduction to testing.

Colin

And the answer his dont re-invent the wheel, look at something called devise.