Extract the aging (Brie, Passes) Gilded Rose items behaviour

Java/src/main/java/com/gildedrose/items/AbstractGildedRoseItem.java

@@ -4,6 +4,8 @@ import com.gildedrose.Item;
 
 public abstract class AbstractGildedRoseItem implements GildedRoseItem{
 
+    protected final static int MAX_QUALITY = 50;
+
     protected final Item item;
 
     public AbstractGildedRoseItem(Item item) {
@@ -14,4 +16,12 @@ public abstract class AbstractGildedRoseItem implements GildedRoseItem{
     public Item getItem() {
         return item;
     }
+
+    protected int getSellIn() {
+        return getItem().sellIn;
+    }
+
+    protected int getQuality() {
+        return getItem().quality;
+    }
 }

Java/src/main/java/com/gildedrose/items/AgingGildedRoseItem.java

@@ -0,0 +1,36 @@
+package com.gildedrose.items;
+
+import com.gildedrose.Item;
+
+public class AgingGildedRoseItem extends AbstractGildedRoseItem {
+
+    final static int DOUBLE_QUALITY_INCREASE_DAYS = 10;
+    final static int TRIPLE_QUALITY_INCREASE_DAYS = 5;
+
+    final Boolean hardDegradation;
+
+    public AgingGildedRoseItem(Item item, Boolean hardDegradation) {
+        super(item);
+        this.hardDegradation = hardDegradation;
+    }
+
+    @Override
+    public GildedRoseItem updateQuality() {
+        item.sellIn = item.sellIn - 1;
+
+        int newQuality;
+
+        if (getSellIn() <= 0) {
+            newQuality = hardDegradation ? 0 : getQuality() - 1;
+        } else if (getSellIn() <= TRIPLE_QUALITY_INCREASE_DAYS) {
+            newQuality = getQuality() + 3;
+        } else if (getSellIn() <= DOUBLE_QUALITY_INCREASE_DAYS) {
+            newQuality = getQuality() + 2;
+        } else {
+            newQuality = getQuality() + 1;
+        }
+        item.quality = Math.min(Math.max(newQuality, 0), MAX_QUALITY);
+
+        return this;
+    }
+}

Java/src/main/java/com/gildedrose/items/GildedRoseItemFactory.java

@@ -9,14 +9,18 @@ import static java.util.regex.Pattern.CASE_INSENSITIVE;
 public class GildedRoseItemFactory {
 
     static final Pattern LEGENDARY_NAME_PATTERN = Pattern.compile("Sulfuras.*", CASE_INSENSITIVE);
-    static final Pattern AGING_ITEM = Pattern.compile("", CASE_INSENSITIVE);
+    static final Pattern AGING_ITEM = Pattern.compile(".*Brie.*", CASE_INSENSITIVE);
+    static final Pattern AGING_HARD_DEGRADATION_ITEM = Pattern.compile("backstage passes.*", CASE_INSENSITIVE);
     static final Pattern CONJURED_ITEM = Pattern.compile("Conjured.*", CASE_INSENSITIVE);
 
     public static GildedRoseItem create(Item item) {
-        if (AGING_ITEM.matcher(item.name).matches()
+        if (CONJURED_ITEM.matcher(item.name).matches()) {
-            || CONJURED_ITEM.matcher(item.name).matches()) {
             return new NonStandardGildedRoseItem(item);
-        }  else if (LEGENDARY_NAME_PATTERN.matcher(item.name).matches()) {
+        } else if (AGING_ITEM.matcher(item.name).matches()) {
+            return new AgingGildedRoseItem(item, false);
+        } else if (AGING_HARD_DEGRADATION_ITEM.matcher(item.name).matches()) {
+            return new AgingGildedRoseItem(item, true);
+        } else if (LEGENDARY_NAME_PATTERN.matcher(item.name).matches()) {
             return new LegendaryGildedRoseItem(item);
         } else {
             return new StandardGildedRoseItem(item);

Java/src/main/java/com/gildedrose/items/StandardGildedRoseItem.java

@@ -4,8 +4,6 @@ import com.gildedrose.Item;
 
 public class StandardGildedRoseItem extends AbstractGildedRoseItem {
 
-    private final static int MAX_QUALITY = 50;
-
     public StandardGildedRoseItem(Item item) {
         super(item);
         item.quality = Math.min(item.quality, MAX_QUALITY);

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

@@ -49,7 +49,7 @@ class GildedRoseTest {
 
     @Test
     void updateQuality_legendaryItem() {
-        GildedRose app = createApp(createItem("Sulfuras, Hand of Ragnaros ", 10, 80));
+        GildedRose app = createApp(createItem("SulFUras, Hand of Ragnaros ", 10, 80));
         app.updateQuality();
 
         assertEquals(10, app.items[0].sellIn);
@@ -57,8 +57,48 @@ class GildedRoseTest {
     }
 
     @Test
-    void updateQuality_agingItem() {
+    void updateQuality_agingItem_normalIncrease() {
-        fail("NYI");
+        GildedRose app = createApp(createItem("Aging Brie", 20, 10));
+        app.updateQuality();
+
+        assertEquals(19, app.items[0].sellIn);
+        assertEquals(11, app.items[0].quality);
+    }
+
+    @Test
+    void updateQuality_agingItem_doubleQualityIncrease() {
+        GildedRose app = createApp(createItem("Aging Brie", 11, 10));
+        app.updateQuality();
+
+        assertEquals(10, app.items[0].sellIn);
+        assertEquals(12, app.items[0].quality);
+    }
+
+    @Test
+    void updateQuality_agingItem_doubleTripleIncrease() {
+        GildedRose app = createApp(createItem("A lot of Aging BRIE", 6, 10));
+        app.updateQuality();
+
+        assertEquals(5, app.items[0].sellIn);
+        assertEquals(13, app.items[0].quality);
+    }
+
+    @Test
+    void updateQuality_agingItem_normalDecrease() {
+        GildedRose app = createApp(createItem("Aging BRIE", 0, 50));
+        app.updateQuality();
+
+        assertEquals(-1, app.items[0].sellIn);
+        assertEquals(49, app.items[0].quality);
+    }
+
+    @Test
+    void updateQuality_agingItem_BackstagePasses_HardDegradation() {
+        GildedRose app = createApp(createItem("Backstage paSSes for", 0, 50));
+        app.updateQuality();
+
+        assertEquals(-1, app.items[0].sellIn);
+        assertEquals(0, app.items[0].quality);
     }
 
     @Test