Spec current order cancellation amending backorder

The cancellation happens async in Javascript. Therefore we need to wait
for and outcome on the page to know that the action finished. The
expectation needs to be around that whole block.

We actually want only one job enqueued if the same backorder is
affected. Time to fix that.

spec/system/admin/orders/bulk_actions_spec.rb

@@ -467,18 +467,21 @@ RSpec.describe '
           }.not_to enqueue_mail
         end
 
+        expect(page).not_to have_content "This will cancel the current order."
+
         page.find("span.icon-reorder", text: "Actions").click
         within ".ofn-drop-down .menu" do
           page.find("span", text: "Cancel Orders").click
         end
 
-        within ".reveal-modal" do
-          expect {
+        expect {
+          within ".reveal-modal" do
             click_on "Confirm" # Confirms the cancel action
-          }.not_to enqueue_mail
-        end
-
-        expect(page).to have_content("CANCELLED", count: 2)
+          end
+          expect(page).to have_content("CANCELLED", count: 2)
+        }.to enqueue_job(AmendBackorderJob).exactly(:twice)
+          # You can't combine negative matchers.
+          .and enqueue_mail.exactly(0).times
       end
     end