Full test suite with 100% coverage.

php7/phpunit.xml

@@ -10,4 +10,10 @@
 			<directory suffix="Test.php">test</directory>
 		</testsuite>
 	</testsuites>
+
+	<filter>
+		<whitelist>
+			<directory>src</directory>
+		</whitelist>
+	</filter>
 </phpunit>

php7/src/GildedRose.php

@@ -2,15 +2,15 @@
 
 namespace App;
 
-class GildedRose {
+final class GildedRose {
 
     private $items = [];
 
-    function __construct($items) {
+    public function __construct($items) {
         $this->items = $items;
     }
 
-    function updateQuality() {
+    public function updateQuality() {
         foreach ($this->items as $item) {
             if ($item->name != 'Aged Brie' and $item->name != 'Backstage passes to a TAFKAL80ETC concert') {
                 if ($item->quality > 0) {

php7/src/Item.php

@@ -2,7 +2,7 @@
 
 namespace App;
 
-class Item {
+final class Item {
 
     public $name;
     public $sell_in;

php7/test/GildedRoseTest.php

@@ -2,13 +2,45 @@
 
 namespace App;
 
-require_once __DIR__ . '/../vendor/autoload.php';
-
 class GildedRoseTest extends \PHPUnit\Framework\TestCase {
     public function testFoo() {
         $items = array(new Item("foo", 0, 0));
         $gildedRose = new GildedRose($items);
         $gildedRose->updateQuality();
-        $this->assertEquals("fixme", $items[0]->name);
+        $this->assertEquals("foo", $items[0]->name);
+        $this->assertEquals("foo, -1, 0", (string)$items[0]);
+    }
+
+    /**
+     * @dataProvider itemProvider
+     */
+    public function testItems(Item $item, $expected, $sellIn) {
+        $rose = new GildedRose([$item]);
+
+        while ($sellIn > 1) {
+            $rose->updateQuality();
+            $sellIn--;
+        }
+
+        $actual = $item->quality;
+        $this->assertEquals($expected, $actual);
+    }
+
+    public function itemProvider() {
+        // if you comment out any assignment/increment/decrement operation in updateQuality,
+        // at least one of these tests should fail. If there isn't a failure, then perhaps
+        // that line of code does not need to exist.
+        return [
+            'foo'         => ['item' => new Item('foo', 9, 10), 'expected' => 2, 'sell_in' => 9],
+            'Aged Brie'   => ['item' => new Item('Aged Brie', 9, 10), 'expected' => 18, 'sell_in' => 9],
+            'Backstage'   => ['item' => new Item('Backstage passes to a TAFKAL80ETC concert', 9, 10), 'expected' => 30, 'sell_in' => 9],
+            'Backstage2'   => ['item' => new Item('Backstage passes to a TAFKAL80ETC concert', 9, 10), 'expected' => 0, 'sell_in' => 19],
+            'Backstage3'   => ['item' => new Item('Backstage passes to a TAFKAL80ETC concert', 9, 10), 'expected' => 0, 'sell_in' => 19],
+            'Sulfuras1'   => ['item' => new Item('Sulfuras, Hand of Ragnaros', 9, 10), 'expected' => 10, 'sell_in' => 9],
+            'aged-foo'    => ['item' => new Item('foo', 3, 14), 'expected' => 1, 'sell_in' => 9],
+            'qualityFoo'  => ['item' => new Item('foo', 3, 94), 'expected' => 39, 'sell_in' => 30],
+            'qualityBrie' => ['item' => new Item('Aged Brie', 3, 94), 'expected' => 94, 'sell_in' => 30],
+            'cheapBrie' => ['item' => new Item('Aged Brie', 3, 3), 'expected' => 50, 'sell_in' => 30],
+        ];
     }
 }