Fix spec and remove usless order spec

core/spec/models/spree/order_credit_sorter_spec.rb

@@ -18,7 +18,7 @@
     end
 
     it 'invokes the default sorting order' do
-      expect(credits).to receive(:in_priority_order)
+      expect(credits).to receive(:order_by_priority)
       subject
     end
   end

core/spec/models/spree/order_spec.rb

@@ -1361,10 +1361,6 @@ def generate
             expect(primary_payment.amount).to eq(order_total - amount_difference)
             expect(secondary_payment.amount).to eq(amount_difference)
           end
-
-          it 'creates a new prioritizer' do
-            expect(Spree::Config.order_credit_sorter_class).to have_received(:new).with(order)
-          end
         end
       end
     end