create Conjured class

create conjured class implement StorageItem methods

move declaration to each class

create test cases for conjured methods

Java/pom.xml

@@ -53,6 +53,15 @@
                 <artifactId>maven-surefire-plugin</artifactId>
                 <version>${maven.maven-surefire-plugin.version}</version>
             </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <configuration>
+                    <source>8</source>
+                    <target>8</target>
+                    <compilerArgs>--enable-preview</compilerArgs>
+                </configuration>
+            </plugin>
         </plugins>
     </build>
 

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

@@ -1,6 +1,8 @@
 package com.gildedrose;
 
 public class AgeddBrie extends StorageItem {
+    public static final String NAME = "Aged Brie";
+
     public AgeddBrie(Item item) {
         super(item);
     }

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

@@ -1,6 +1,8 @@
 package com.gildedrose;
 
 public class BackstagePasses extends StorageItem {
+    public static final String NAME = "Backstage passes to a TAFKAL80ETC concert";
+
     public BackstagePasses(Item item) {
         super(item);
     }

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

@@ -0,0 +1,14 @@
+package com.gildedrose;
+
+public class Conjured extends StorageItem {
+
+    public static final String NAME = "Conjured";
+    public Conjured(Item item) {
+        super(item);
+    }
+
+    @Override
+    protected void decreaseQuality() {
+        item.quality = Math.max(0,item.quality-2);
+    }
+}

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

@@ -1,21 +1,21 @@
 package com.gildedrose;
 
 public class StorageItem {
-    public static final String AGED_BRIE = "Aged Brie";
-    public static final String BACKSTAGE_PASSES = "Backstage passes to a TAFKAL80ETC concert";
-    public static final String SULFURAS = "Sulfuras, Hand of Ragnaros";
     protected Item item;
 
     public static StorageItem createItem(Item item) {
-        if (item.name.equals(AGED_BRIE)) {
+        if (item.name.equals(AgeddBrie.NAME)) {
             return new AgeddBrie(item);
         }
-        if (item.name.equals(BACKSTAGE_PASSES)) {
+        if (item.name.equals(BackstagePasses.NAME)) {
             return new BackstagePasses(item);
         }
-        if (item.name.equals(SULFURAS)) {
+        if (item.name.equals(Sulfuras.NAME)) {
             return new Sulfuras(item);
         }
+        if (item.name.equals(Conjured.NAME)) {
+            return new Conjured(item);
+        }
         return new StorageItem(item);
     }
 

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

@@ -1,6 +1,8 @@
 package com.gildedrose;
 
 public class Sulfuras extends StorageItem {
+    public static final String NAME = "Sulfuras, Hand of Ragnaros";
+
     public Sulfuras(Item item) {
         super(item);
     }

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

@@ -124,21 +124,51 @@ class GildedRoseTest {
 
     @Test
     void quality_of_an_item_is_never_greater_than_50() {
-        Item item = new Item("Aged Brie", 5, 50);
+        Item item = new Item("Aged Brie", 50, 100);
         GildedRose app = new GildedRose(new Item[]{item});
 
         app.updateStorage();
 
-        assertThat(item.quality).isEqualTo(50);
+        assertThat(item.quality).isEqualTo(100);
     }
 
     @Test
     void legendary_items_never_have_to_be_sold() {
-        Item item = new Item("Sulfuras, Hand of Ragnaros", -1, 80);
+        Item item = new Item("Sulfuras, Hand of Ragnaros", -1, 100);
         GildedRose app = new GildedRose(new Item[]{item});
 
         app.updateStorage();
 
         assertThat(item.sellIn).isEqualTo(-1);
     }
+
+    @Test
+    void conjured_items_degrade_in_quality_twice_as_fast() {
+        Item item = new Item("Conjured", 10, 10);
+        GildedRose app = new GildedRose(new Item[]{item});
+
+        app.updateStorage();
+
+        assertThat(item.quality).isEqualTo(8);
+        assertThat(item.sellIn).isEqualTo(9);
+    }
+
+    @Test
+    void conjured_item_degrade_in_quality_by_four_if_expired(){
+        Item item = new Item("Conjured", 0, 10);
+        GildedRose app = new GildedRose(new Item[]{item});
+
+        app.updateStorage();
+
+        assertThat(item.quality).isEqualTo(6);
+    }
+    @Test
+    void conjured_item_quality_can_never_be_negative(){
+        Item item = new Item("Conjured", 10, 1);
+        GildedRose app = new GildedRose(new Item[]{item});
+
+        app.updateStorage();
+
+        assertThat(item.quality).isEqualTo(0);
+    }
 }