Test when 3+1 and remove item

Author: lukaszreszke

ecommerce/pricing/test/three_plus_one_test.rb

@@ -395,5 +395,44 @@ def test_given_three_plus_one_promotion_when_eight_items_are_added_then_two_item
         )
       ) { add_item(order_id, product_id, promotion: true) }
     end
+
+    def test_given_three_plus_one_is_applied_when_item_is_removed_then_the_discount_is_removed
+      product_id = SecureRandom.uuid
+      set_price(product_id, 20)
+      order_id = SecureRandom.uuid
+      stream = "Pricing::Offer$#{order_id}"
+
+      4.times { add_item(order_id, product_id, promotion: true) }
+
+      assert_events(
+        stream,
+        PriceItemRemoved.new(
+          data: {
+            order_id: order_id,
+            product_id: product_id,
+            base_price: 20,
+            price: 0,
+            base_total_value: 60,
+            total_value: 60
+          }
+        ),
+        OrderTotalValueCalculated.new(
+          data: {
+            order_id: order_id,
+            total_amount: 60,
+            discounted_amount: 60
+          }
+        ),
+        PriceItemValueCalculated.new(
+          data: {
+            order_id: order_id,
+            product_id: product_id,
+            quantity: 3,
+            amount: 60,
+            discounted_amount: 60,
+          }
+        )
+      ) { remove_item(order_id, product_id) }
+    end
   end
 end