Would this make you angry?

something_steps.rb

When /^I am on the Billing\/Shipping address page$/ do

  # setting the order_id to 1 in the session
  class Spree::BaseController < ApplicationController
    prepend_before_filter :stub_order_id_in_session
    def stub_order_id_in_session
      session[:order_id] = 1
    end
  end

  page.visit '/orders/XYZ12345'
end

Yay Ruby!!