To make the application work with Conjured items, add new feature

php/src/GildedRoseItem/ConjuredItem.php

@@ -0,0 +1,30 @@
+<?php
+
+declare(strict_types=1);
+
+namespace GildedRose\GildedRoseItem;
+
+use GildedRose\GildedRoseItem;
+use GildedRose\Item;
+
+class ConjuredItem implements GildedRoseItem
+{
+    public const NAME = 'Conjured Mana Cake';
+
+    public function __construct(private Item $item) {}
+
+    public function ageByOneDay(): void
+    {
+        $this->item->sellIn -= 1;
+        $this->item->quality = max(0, $this->getNewQuality($this->item->quality, $this->item->sellIn));
+    }
+
+    private function getNewQuality(int $previousQuality, int $sellIn): int
+    {
+        if ($sellIn < 0) {
+            return $previousQuality - 4;
+        }
+
+        return $previousQuality - 2;
+    }
+}

php/src/GildedRoseItemFactory.php

@@ -6,6 +6,7 @@ namespace GildedRose;
 
 use GildedRose\GildedRoseItem\BrieItem;
 use GildedRose\GildedRoseItem\BackstagePassItem;
+use GildedRose\GildedRoseItem\ConjuredItem;
 use GildedRose\GildedRoseItem\SulfurasItem;
 use GildedRose\GildedRoseItem\DefaultItem;
 
@@ -20,6 +21,8 @@ class GildedRoseItemFactory
                 return new BackstagePassItem($item);
             case SulfurasItem::NAME:
                 return new SulfurasItem($item);
+            case ConjuredItem::NAME:
+                return new ConjuredItem($item);
             default:
                 return new DefaultItem($item);
         }

php/tests/approval/approvals/ApprovalTest.testThirtyDays.approved.txt

@@ -21,7 +21,7 @@ Sulfuras, Hand of Ragnaros, -1, 80
 Backstage passes to a TAFKAL80ETC concert, 14, 21
 Backstage passes to a TAFKAL80ETC concert, 9, 50
 Backstage passes to a TAFKAL80ETC concert, 4, 50
-Conjured Mana Cake, 2, 5
+Conjured Mana Cake, 2, 4
 
 -------- day 2 --------
 name, sellIn, quality
@@ -33,7 +33,7 @@ Sulfuras, Hand of Ragnaros, -1, 80
 Backstage passes to a TAFKAL80ETC concert, 13, 22
 Backstage passes to a TAFKAL80ETC concert, 8, 50
 Backstage passes to a TAFKAL80ETC concert, 3, 50
-Conjured Mana Cake, 1, 4
+Conjured Mana Cake, 1, 2
 
 -------- day 3 --------
 name, sellIn, quality
@@ -45,7 +45,7 @@ Sulfuras, Hand of Ragnaros, -1, 80
 Backstage passes to a TAFKAL80ETC concert, 12, 23
 Backstage passes to a TAFKAL80ETC concert, 7, 50
 Backstage passes to a TAFKAL80ETC concert, 2, 50
-Conjured Mana Cake, 0, 3
+Conjured Mana Cake, 0, 0
 
 -------- day 4 --------
 name, sellIn, quality
@@ -57,7 +57,7 @@ Sulfuras, Hand of Ragnaros, -1, 80
 Backstage passes to a TAFKAL80ETC concert, 11, 24
 Backstage passes to a TAFKAL80ETC concert, 6, 50
 Backstage passes to a TAFKAL80ETC concert, 1, 50
-Conjured Mana Cake, -1, 1
+Conjured Mana Cake, -1, 0
 
 -------- day 5 --------
 name, sellIn, quality

php/tests/behat/contexts/ServiceLevelContext.php

@@ -84,4 +84,10 @@ class ServiceLevelContext implements Context
     {
         $this->createItem('Sulfuras, Hand of Ragnaros', $initialSellIn, $initialQuality);
     }
+
+    #[Given('a conjured item with a sell-in of :initialSellIn and a quality of :initialQuality')]
+    public function aConjuredItemWithASellInOfAndAQualityOf(int $initialSellIn, int $initialQuality): void
+    {
+        $this->createItem('Conjured Mana Cake', $initialSellIn, $initialQuality);
+    }
 }

php/tests/behat/feature_files/conjured-items.feature

@@ -3,19 +3,19 @@ Feature: Conjured items
   As a shopkeeper
   I want to see the quality of a conjured item decrease by 2 each day
 
-  @wip
+
   Scenario: Single quality update
     Given a conjured item with a sell-in of 20 and a quality of 20
     When I update the quality
     Then the item should have a quality of 18
 
-  @wip
+
   Scenario: Quality cannot be negative
       Given a conjured item with a sell-in of 20 and a quality of 0
       When I update the quality
       Then the item should have a quality of 0
 
-  @wip
+
   Scenario: Once the sell-by date has passed, quality degrades twice as fast
       Given a conjured item with a sell-in of 0 and a quality of 20
       When I update the quality

php/tests/phpunit/GildedRoseItem/ConjuredItemTest.php

@@ -0,0 +1,52 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PhpUnitTests\GildedRoseItem;
+
+use ApprovalTests\Approvals;
+use GildedRose\GildedRoseItem;
+use GildedRose\GildedRoseItem\ConjuredItem;
+use GildedRose\GildedRoseItemFactory;
+use GildedRose\Item;
+use PHPUnit\Framework\TestCase;
+
+class ConjuredItemTest extends TestCase
+{
+    public function testNormalQualityReduction(): void
+    {
+        $item = new Item(ConjuredItem::NAME, 20, 20);
+        $gildedRoseItem = new ConjuredItem($item);
+        $gildedRoseItem->ageByOneDay();
+
+        $this->assertEquals(18, $item->quality);
+        $this->assertEquals(19, $item->sellIn);
+    }
+
+    public function testQualityCantBeNegative(): void
+    {
+        $item = new Item(ConjuredItem::NAME, 20, 0);
+        $gildedRoseItem = new ConjuredItem($item);
+        $gildedRoseItem->ageByOneDay();
+
+        $this->assertEquals(0, $item->quality);
+    }
+
+    public function testQualityDegradesTwiceAsFastAsDefault(): void
+    {
+        $item = new Item(ConjuredItem::NAME, 20, 20);
+        $gildedRoseItem = new ConjuredItem($item);
+        $gildedRoseItem->ageByOneDay();
+
+        $this->assertEquals(18, $item->quality);
+    }
+
+    public function testQualityDegradesTwiceAsFastAfterSellBy(): void
+    {
+        $item = new Item(ConjuredItem::NAME, 0, 20);
+        $gildedRoseItem = new ConjuredItem($item);
+        $gildedRoseItem->ageByOneDay();
+
+        $this->assertEquals(16, $item->quality);
+    }
+}

php/tests/phpunit/GildedRoseItemFactoryTest.php

@@ -8,6 +8,7 @@ use ApprovalTests\Approvals;
 use GildedRose\GildedRoseItem;
 use GildedRose\GildedRoseItem\BrieItem;
 use GildedRose\GildedRoseItem\BackstagePassItem;
+use GildedRose\GildedRoseItem\ConjuredItem;
 use GildedRose\GildedRoseItem\DefaultItem;
 use GildedRose\GildedRoseItem\SulfurasItem;
 use GildedRose\GildedRoseItemFactory;
@@ -58,4 +59,13 @@ class GildedRoseItemFactoryTest extends TestCase
         $this->assertInstanceOf(GildedRoseItem::class, $gildedRoseItem);
         $this->assertInstanceOf(SulfurasItem::class, $gildedRoseItem);
     }
+
+    public function testCreatingConjuredItem(): void
+    {
+        $item = new Item('Conjured Mana Cake', 0, 0);
+        $gildedRoseItem = $this->factory->createGildedRoseItem($item);
+
+        $this->assertInstanceOf(GildedRoseItem::class, $gildedRoseItem);
+        $this->assertInstanceOf(ConjuredItem::class, $gildedRoseItem);
+    }
 }