Revert "Removed test which was misleading and had no impact on coverage"

This reverts commit f2f42b9.

Author: andrzejkrzywda

rails_application/test/orders/discount_test.rb

@@ -59,6 +59,21 @@ def test_remove_discount
       assert event_store.event_in_stream?(event_store.read.of_type([Pricing::PercentageDiscountRemoved]).last.event_id, "Orders$all")
     end
 
+    def test_does_not_remove_percentage_discount_when_removing_time_promotion
+      customer_id = SecureRandom.uuid
+      product_id = SecureRandom.uuid
+      order_id = SecureRandom.uuid
+      create_active_time_promotion
+      customer_registered(customer_id)
+      prepare_product(product_id)
+      item_added_to_basket(order_id, product_id)
+      set_percentage_discount(order_id)
+
+      assert_no_changes -> { Orders::Order.find_by(uid: order_id).percentage_discount } do
+        travel_to(1.minute.from_now) { item_added_to_basket(order_id, product_id) }
+      end
+    end
+
     def test_newest_event_is_always_applied
       customer_id = SecureRandom.uuid
       product_id = SecureRandom.uuid