refactor: simplify using gildedrose

Java/src/main/java/com/gildedrose/GildedRose.java

@@ -1,15 +1,15 @@
 package com.gildedrose;
 
+import java.util.List;
+
 class GildedRose {
-    Item[] items;
+    private final List<Item> items;
 
     public GildedRose(Item[] items) {
-        this.items = items;
+        this.items = List.of(items);
     }
 
-    public void updateQuality() {
-        for (Item item : items) {
-            item.updateItem();
-        }
+    public void degradeItems() {
+        items.forEach(Item::degrade);
     }
 }

Java/src/test/java/com/gildedrose/GildedRoseTest.java

@@ -7,16 +7,23 @@ import static org.junit.jupiter.api.Assertions.assertEquals;
 class GildedRoseTest {
 
     @Test
-    void givenListOfItems_whenUpdateQuality_thenNameRemainsUnchanged() {
-        final var name = "foo";
-
-        var items = new Item[] { new Item(name, 0, 0) };
+    void givenMultipleItems_whenDegradeItems_thenAllItemsDegradeCorrectly() {
+        Item[] items = {
+            new NormalItem("Normal Item", 10, 20),
+            new AgedBrieItem("Aged Brie", 5, 10),
+            new BackstagePassItem("Backstage Pass", 15, 30),
+            new SulfurasItem("Sulfuras, Hand of Ragnaros", 0, 80)
+        };
         var app = new GildedRose(items);
+        app.degradeItems();
 
-        app.updateQuality();
-
-        assertEquals(name, app.items[0].getName());
+        assertEquals(9, items[0].sellIn);
+        assertEquals(19, items[0].quality);
+        assertEquals(4, items[1].sellIn);
+        assertEquals(11, items[1].quality);
+        assertEquals(14, items[2].sellIn);
+        assertEquals(31, items[2].quality);
+        assertEquals(0, items[3].sellIn);
+        assertEquals(80, items[3].quality);
     }
-
-
 }