diff --git a/php/tests/GildedRoseTest.php b/php/tests/GildedRoseTest.php
index 52e7ddc6..ed2d869b 100644
--- a/php/tests/GildedRoseTest.php
+++ b/php/tests/GildedRoseTest.php
@@ -10,11 +10,127 @@ use PHPUnit\Framework\TestCase;
 
 class GildedRoseTest extends TestCase
 {
-    public function testFoo(): void
+    public function test_item_should_increase_quality_by_2(): void
     {
-        $items = [new Item('foo', 0, 0)];
-        $gildedRose = new GildedRose($items);
-        $gildedRose->updateQuality();
-        $this->assertSame('fixme', $items[0]->name);
+        $items = [new Item('item', 0,80)];
+        $sut = new GildedRose($items);
+
+        $sut->updateQuality();
+
+        $this->assertSame(78, $items[0]->quality);
     }
-}
+
+    public function test_quality_never_be_negative(): void
+    {
+        $items = [new Item('item', 0,0)];
+        $sut = new GildedRose($items);
+
+        $sut->updateQuality();
+
+        $this->assertSame(0, $items[0]->quality);
+    }
+
+    public function test_item_should_sellable(): void
+    {
+        $items = [new Item('item', 2,80)];
+        $sut = new GildedRose($items);
+
+        $sut->updateQuality();
+
+        $this->assertSame(1, $items[0]->sellIn);
+    }
+
+
+    public function test_aged_brie_quality_is_increasable(): void
+    {
+        $items = [new Item('Aged Brie', 60,20)];
+        $sut = new GildedRose($items);
+
+        $sut->updateQuality();
+
+        $this->assertSame(21, $items[0]->quality);
+    }
+
+    public function test_max_quality_is_50(): void
+    {
+        $items = [new Item('Aged Brie', 0,50)];
+        $sut = new GildedRose($items);
+
+        $sut->updateQuality();
+
+        $this->assertSame(50, $items[0]->quality);
+    }
+    public function test_aged_brie_is_sellable(): void
+    {
+        $items = [new Item('Aged Brie', 60,20)];
+        $sut = new GildedRose($items);
+
+        $sut->updateQuality();
+
+        $this->assertSame(59, $items[0]->sellIn);
+    }
+
+
+
+    public function test_sulfuras_never_ruined(): void
+    {
+        $items = [new Item('Sulfuras, Hand of Ragnaros', 0,80)];
+        $sut = new GildedRose($items);
+
+        $sut->updateQuality();
+
+        $this->assertSame(80, $items[0]->quality);
+    }
+
+    public function test_sulfuras_is_not_sellable(): void
+    {
+        $items = [new Item('Sulfuras, Hand of Ragnaros', 0,80)];
+        $sut = new GildedRose($items);
+
+        $sut->updateQuality();
+
+        $this->assertSame(0, $items[0]->sellIn);
+    }
+
+
+
+    public function test_backstage_passes_quality_increases_by_2(): void
+    {
+        $items = [new Item('Backstage passes to a TAFKAL80ETC concert', 10,20)];
+        $sut = new GildedRose($items);
+
+        $sut->updateQuality();
+
+        $this->assertSame(22, $items[0]->quality);
+    }
+
+    public function test_backstage_passes_quality_increases_by_3(): void
+    {
+        $items = [new Item('Backstage passes to a TAFKAL80ETC concert', 5,20)];
+        $sut = new GildedRose($items);
+
+        $sut->updateQuality();
+
+        $this->assertSame(23, $items[0]->quality);
+    }
+
+    public function test_backstage_passes_quality_dropped_to_zero(): void
+    {
+        $items = [new Item('Backstage passes to a TAFKAL80ETC concert', 0,20)];
+        $sut = new GildedRose($items);
+
+        $sut->updateQuality();
+
+        $this->assertSame(0, $items[0]->quality);
+    }
+
+    public function test_backstage_passes_is_sellable(): void
+    {
+        $items = [new Item('Backstage passes to a TAFKAL80ETC concert', 5,20)];
+        $sut = new GildedRose($items);
+
+        $sut->updateQuality();
+
+        $this->assertSame(4, $items[0]->sellIn);
+    }
+}
\ No newline at end of file