### Question:
Order implements Serializable { public BigDecimal getItemCount() { return new OrderItemAggregator() { @Override protected BigDecimal add(BigDecimal sum, OrderItem orderItem) { return sum.add(BigDecimal.ONE); } }.aggregate(); } Order(long orderId, ObjectId userId, List<OrderItem> orderItems, DeliveryAddress deliveryAddress, String sessionId);  Order(); long getOrderId(); void setOrderId(Long orderId); ObjectId getUserId(); void setUserId(ObjectId userId); List<OrderItem> getOrderItems(); Date getOrderDate(); void setOrderDate(Date orderDate); DeliveryAddress getDeliveryAddress(); void setDeliveryAddress(DeliveryAddress deliveryAddress); Supplier getSupplier(); void setSupplier(Supplier supplier); String getSessionId(); void setSessionId(String sessionId); void setOrderId(long orderId); BigDecimal getItemCount(); BigDecimal getItemPriceSum(); BigDecimal getTotalSum(); static final String COLLECTION_NAME; }### Answer:
@Test public void testGetProductCount() throws Exception { assertEquals(BigDecimal.valueOf(2).compareTo(order.getItemCount()), 0); }