@Test
public void shouldCalculateDiscountByAmountBought() throws Exception {
FreeGiftDiscount freeGiftDiscount = new FreeGiftDiscount(2, 1, 0); // buy 2 get 1 free
Double price =
freeGiftDiscount.discountedPrice(
new OrderLineItem(new Product("xyz", "ItemXXX", 50d, "pill", null), 10),
new PlainTextViewModel());
assertThat(price, is(350d));
}
@Test
public void shouldCalculateDiscountByAmountBoughtWithOddNumbers()
throws Exception { // odd number: 买几送几都行
FreeGiftDiscount freeGiftDiscount = new FreeGiftDiscount(7, 3, 0); // 买7送3
Double price =
freeGiftDiscount.discountedPrice(
new OrderLineItem(new Product("xyz", "ItemXXX", 6d, "piece", null), 13),
new PlainTextViewModel());
assertThat(price, is(60d)); // 买7送3,前10个7*6=42,剩下3个还要单独付款18,共计60
}
