tdd-java-demo

commit ac80f9b8c7239b9c616b5903c5e8ccd3ea9c8181
parent 82c94ef24ac95e9b93b2416f6e7b77d60505dd13
Author: Jul <jul@9o.is>
Date:   Wed, 31 Mar 2021 19:46:16 +0800

apply multiple discounts when multiple items are met

Diffstat:
M
src/main/java/takehome/Discount.java
 | 
11
++++++++++-
M
src/test/java/takehome/DiscountTest.java
 | 
6
++++++

2 files changed, 16 insertions(+), 1 deletion(-)
diff --git a/src/main/java/takehome/Discount.java b/src/main/java/takehome/Discount.java
@@ -28,7 +28,16 @@ public class Discount {
     }
 
     double getDiscount(Basket basket) {
-        return amount * basket.getAmount(getSingleItem());
+        Map<Item, Integer> frequencies = new HashMap<>();
+
+        for (Item item : items.keySet()) {
+            frequencies.put(item, basket.getAmount(item));
+        }
+
+        int frequency = frequencies.values()
+                .stream().reduce(Math::min).orElse(0);
+
+        return amount * frequency;
     }
 
     private Item getSingleItem() {
diff --git a/src/test/java/takehome/DiscountTest.java b/src/test/java/takehome/DiscountTest.java
@@ -57,6 +57,12 @@ class DiscountTest {
         assertThat(SOUP_BREAD_DISCOUNT.getDiscount(basket), is(0.40));
     }
 
+    @Test
+    void multipleItemsMultipleDiscounts() {
+        Basket basket = createBasketWithSoupBread(4, 2);
+        assertThat(SOUP_BREAD_DISCOUNT.getDiscount(basket), is(0.80));
+    }
+
     private Basket createBasketWithApples(int amount) {
         Map<Item, Integer> amounts = new HashMap<>();
         amounts.put(APPLE, amount);