public virtual void test_withPrice()
        {
            DsfTrade @base    = sut();
            double   price    = 6423d;
            DsfTrade computed = @base.withPrice(price);
            DsfTrade expected = DsfTrade.builder().info(TRADE_INFO).product(PRODUCT).quantity(QUANTITY).price(price).build();

            assertEquals(computed, expected);
        }
        //-------------------------------------------------------------------------
        public virtual void test_builder()
        {
            DsfTrade test = sut();

            assertEquals(test.Info, TRADE_INFO);
            assertEquals(test.Product, PRODUCT);
            assertEquals(test.Quantity, QUANTITY);
            assertEquals(test.Price, PRICE);
            assertEquals(test.SecurityId, PRODUCT.SecurityId);
            assertEquals(test.Currency, PRODUCT.Currency);
            assertEquals(test.withInfo(TRADE_INFO).Info, TRADE_INFO);
            assertEquals(test.withQuantity(129).Quantity, 129d, 0d);
            assertEquals(test.withPrice(129).Price, 129d, 0d);
        }