@Test
public void testInitialPriceWithApplesAndBreadOffer() {
double v = 0;
for (Item.Type itemType : content.keySet())
v += Item.getInstance(itemType).getUnitPrice() * content.get(itemType);
PriceCalculator priceCalculator = new PriceCalculatorImpl(new ApplesOffer(), new BreadOffer());
assertEquals(v, priceCalculator.getInitialPrice(basket), PRICE_TOLERANCE);
}
@Test
public void testDiscountWithBreadOffer() {
Offer breadOffer = new BreadOffer();
PriceCalculator priceCalculator = new PriceCalculatorImpl(new BreadOffer());
double discount =
priceCalculator
.getDiscounts(basket)
.entrySet()
.stream()
.collect(Collectors.summingDouble(Entry::getValue));
assertEquals(breadOffer.getDiscount(basket), discount, PRICE_TOLERANCE);
}
@Test
public void testDiscountWithoutOffer() {
PriceCalculator priceCalculator = new PriceCalculatorImpl();
assertTrue(priceCalculator.getDiscounts(basket).isEmpty());
}