Use Order Walkthrough to fix 'defaults to use billing address' test w…

…ithin checkout_spec

core/spec/requests/checkout_spec.rb

@@ -38,12 +38,10 @@
 
     context "defaults to use billing address" do
       before do
-        # Add country to shipping method's list so we can proceed to delivery
         shipping_method = create(:shipping_method)
         shipping_method.zone.zone_members << Spree::ZoneMember.create(:zoneable => country)
 
-        @order = create(:order_with_totals, :state => 'cart',
-                                            :shipping_method => shipping_method)
+        @order = OrderWalkthrough.up_to(:address)
         @order.stub(:available_payment_methods => [ create(:bogus_payment_method, :environment => 'test') ])
 
         visit spree.root_path