From 44085d93d05ec3f8e82ef172e67ffe73b8c4eeac Mon Sep 17 00:00:00 2001
From: Kacper Majczak <kacpermajczak1@gmail.com>
Date: Mon, 12 Sep 2022 12:57:16 +0200
Subject: [PATCH] Add tests

---
 php/tests/GildedRoseTest.php | 109 +++++++++++++++++++++++++++++++++++
 1 file changed, 109 insertions(+)

diff --git a/php/tests/GildedRoseTest.php b/php/tests/GildedRoseTest.php
index 7dd29849..856dfa27 100644
--- a/php/tests/GildedRoseTest.php
+++ b/php/tests/GildedRoseTest.php
@@ -17,4 +17,113 @@ class GildedRoseTest extends TestCase
         $gildedRose->updateQuality();
         $this->assertSame('foo', $items[0]->name);
     }
+
+    public function testQualityDegradesTwiceAsFastWhenSellDateHasPassed(): void
+    {
+        //Given
+        $items = [new Item('foo', 0, 5)];
+        $gildedRose = new GildedRose($items);
+
+        //When
+        $gildedRose->updateQuality();
+
+        //Then
+        $this->assertSame(3, $items[0]->quality);
+    }
+
+    public function testQualityOfItemIsNeverNegative(): void
+    {
+        //Given
+        $items = [new Item('foo', 0, 0)];
+        $gildedRose = new GildedRose($items);
+
+        //When
+        $gildedRose->updateQuality();
+
+        //Then
+        $this->assertSame(0, $items[0]->quality);
+    }
+
+    /**
+     * @dataProvider itemsThatIncreasesQualityWhenGetsOlder
+     */
+    public function testItemIncreasesQualityWhenGetsOlder(
+        string $name,
+        int $sellIn,
+        int $resultSellIn,
+        int $quality,
+        int $resultQuality
+    ): void {
+        //Given
+        $items = [new Item($name, $sellIn, $quality)];
+        $gildedRose = new GildedRose($items);
+
+        //When
+        $gildedRose->updateQuality();
+
+        //Then
+        $this->assertSame($resultQuality, $items[0]->quality);
+        $this->assertSame($resultSellIn, $items[0]->sell_in);
+    }
+
+    public function itemsThatIncreasesQualityWhenGetsOlder(): array
+    {
+        return [
+            [
+                'name' => 'Aged Brie',
+                'sell_in' => 10,
+                'result_sell_in' => 9,
+                'quality' => 5,
+                'result_quality' => 6
+            ],
+            'Quality increases by 2 when there are 10 days or less' => [
+                'name' => 'Backstage passes to a TAFKAL80ETC concert',
+                'sell_in' => 10,
+                'result_sell_in' => 9,
+                'quality' => 5,
+                'result_quality' => 7
+            ],
+            'Quality increases by 3 when there are 5 days or less' => [
+                'name' => 'Backstage passes to a TAFKAL80ETC concert',
+                'sell_in' => 5,
+                'result_sell_in' => 4,
+                'quality' => 5,
+                'result_quality' => 8
+            ],
+            'Quality drops to 0 after the concert' => [
+                'name' => 'Backstage passes to a TAFKAL80ETC concert',
+                'sell_in' => 0,
+                'result_sell_in' => -1,
+                'quality' => 5,
+                'result_quality' => 0
+            ],
+        ];
+    }
+
+    public function testQualityOfItemIsNeverAboveFifty(): void
+    {
+        //Given
+        $items = [new Item('Aged Brie', 5, 50)];
+        $gildedRose = new GildedRose($items);
+
+        //When
+        $gildedRose->updateQuality();
+
+        //Then
+        $this->assertSame(50, $items[0]->quality);
+    }
+
+    public function testItemSulfurasNeverChangeItsProperties(): void
+    {
+        //Given
+        $items = [new Item('Sulfuras, Hand of Ragnaros', 5, 5)];
+        $gildedRose = new GildedRose($items);
+
+        //When
+        $gildedRose->updateQuality();
+
+        //Then
+        $this->assertSame(5, $items[0]->quality);
+        $this->assertSame(5, $items[0]->sell_in);
+    }
 }