Fix ship method when advancing subscription order

app/jobs/subscription_placement_job.rb

@@ -59,7 +59,7 @@ class SubscriptionPlacementJob
   end
 
   def move_to_completion(order)
-    until order.completed? do order.next! end
+    AdvanceOrderService.new(order).call!
   end
 
   def unavailable_stock_lines_for(order)

spec/jobs/subscription_placement_job_spec.rb

@@ -155,7 +155,7 @@ describe SubscriptionPlacementJob do
           create(:subscription, shop: shop, shipping_method: shipping_method, with_items: true)
         end
 
-        pending "uses the same shipping method after advancing the order" do
+        it "uses the same shipping method after advancing the order" do
           job.send(:process, order)
           expect(order.state).to eq "complete"
           order.reload