Conjured items rule

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

@@ -2,6 +2,7 @@ package com.gildedrose;
 
 import com.gildedrose.rules.AgedBrieQualityRule;
 import com.gildedrose.rules.BackstagePassQualityRule;
+import com.gildedrose.rules.ConjuredQualityRule;
 import com.gildedrose.rules.DefaultQualityRule;
 import com.gildedrose.rules.QualityRule;
 import com.gildedrose.rules.Result;
@@ -18,6 +19,7 @@ class GildedRose {
             new SulfurasQualityRule(),
             new AgedBrieQualityRule(),
             new BackstagePassQualityRule(),
+            new ConjuredQualityRule(),
             new DefaultQualityRule()
     );
 

Java/src/main/java/com/gildedrose/rules/ConjuredQualityRule.java

@@ -0,0 +1,16 @@
+package com.gildedrose.rules;
+
+import static java.lang.Integer.max;
+
+public class ConjuredQualityRule implements QualityRule {
+
+    @Override
+    public boolean shouldApply(String itemName) {
+        return itemName != null && itemName.startsWith("Conjured ");
+    }
+
+    @Override
+    public Result calculateQuality(int oldQuality, int newSellIn) {
+        return new Result(max(oldQuality - 2, 0), true);
+    }
+}

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

@@ -1,35 +1,17 @@
 package com.gildedrose;
 
 import io.qameta.allure.Feature;
-import lombok.val;
 import org.junit.jupiter.params.ParameterizedTest;
 import org.junit.jupiter.params.provider.ValueSource;
 
 import static com.gildedrose.TestHelper.assertItem;
 import static com.gildedrose.TestHelper.prepareApp;
 import static java.lang.Math.max;
-import static org.apache.commons.lang3.RandomUtils.nextInt;
 
 
 class GildedRoseConjuredTest {
 
-    private static final String NAME = "Conjured Mana Cake";
-
-    @Feature("The Quality of an item is never more than 50")
-    @ParameterizedTest(name = "Initial quality: {arguments}")
-    @ValueSource(ints = {49, 50})
-    void shouldNotIncreaseQualityAbove50(int initialQuality) {
-        // given
-        val initialSellIn = nextInt(3, 50);
-        GildedRose app = prepareApp(new Item(NAME, initialSellIn, initialQuality));
-
-        // when
-        app.updateQuality();
-
-        // then
-        final Item item = app.items[0];
-        assertItem(item, "Aged Brie", initialSellIn - 1, 50);
-    }
+    private static final String ITEM_NAME = "Conjured Mana Cake";
 
     @Feature("\"Conjured\" items degrade in Quality twice as fast as normal items")
     @Feature("The Quality of an item is never negative")
@@ -37,7 +19,7 @@ class GildedRoseConjuredTest {
     @ValueSource(ints = {0, 1, 2, 3, 49, 50})
     void shouldDegradeInQualityTwiceFast(int initialQuality) {
         // given
-        GildedRose app = prepareApp(new Item("Aged Brie", 1, initialQuality));
+        GildedRose app = prepareApp(new Item(ITEM_NAME, 1, initialQuality));
 
         // when
         app.updateQuality();
@@ -45,6 +27,6 @@ class GildedRoseConjuredTest {
         // then
         final Item item = app.items[0];
         final int expectedQuality = max(initialQuality - 2, 0);
-        assertItem(item, "Aged Brie", 0, expectedQuality);
+        assertItem(item, ITEM_NAME, 0, expectedQuality);
     }
 }