diff --git a/swift/Tests/GildedRoseTests/GildedRoseBackstageTests.swift b/swift/Tests/GildedRoseTests/GildedRoseBackstageTests.swift
new file mode 100644
index 00000000..39fbcd7c
--- /dev/null
+++ b/swift/Tests/GildedRoseTests/GildedRoseBackstageTests.swift
@@ -0,0 +1,48 @@
+//
+//  GildedRoseBackstageTests.swift
+//
+//
+//  Created by Murat Bataray on 09/02/2023.
+//
+
+@testable import GildedRose
+import XCTest
+
+class GildedRoseBackstageTests: XCTestCase {
+    func test_updateQuality_backstagePassQuality_shouldIncreaseOnceInQualityWhenMoreThan10DaysRemaining() throws {
+        let items = [Item(name: "Backstage passes to a TAFKAL80ETC concert", sellIn: 15, quality: 1)]
+        let app = GildedRose(items: items)
+        app.updateQuality()
+        XCTAssertEqual(app.items[0].quality, 2)
+        app.updateQuality()
+        XCTAssertEqual(app.items[0].quality, 3)
+    }
+    
+    func test_updateQuality_backstagePassQuality_shouldIncreaseByTwoInQualityWhenLessThan10DaysRemaining() throws {
+        let items = [Item(name: "Backstage passes to a TAFKAL80ETC concert", sellIn: 9, quality: 1)]
+        let app = GildedRose(items: items)
+        app.updateQuality()
+        XCTAssertEqual(app.items[0].quality, 3)
+        app.updateQuality()
+        XCTAssertEqual(app.items[0].quality, 5)
+    }
+    
+    func test_updateQuality_backstagePassQuality_shouldIncreaseByThreeInQualityWhenLessThan5DaysRemaining() throws {
+        let items = [Item(name: "Backstage passes to a TAFKAL80ETC concert", sellIn: 5, quality: 1)]
+        let app = GildedRose(items: items)
+        app.updateQuality()
+        XCTAssertEqual(app.items[0].quality, 4)
+        app.updateQuality()
+        XCTAssertEqual(app.items[0].quality, 7)
+    }
+    
+    func test_updateQuality_backstagePassQuality_shouldBeZeroWhenSellByDateHasPassed() throws {
+        let items = [Item(name: "Backstage passes to a TAFKAL80ETC concert", sellIn: 0, quality: 1)]
+        let app = GildedRose(items: items)
+        app.updateQuality()
+        XCTAssertEqual(app.items[0].quality, 0)
+        app.updateQuality()
+        XCTAssertEqual(app.items[0].quality, 0)
+    }
+}
+
diff --git a/swift/Tests/GildedRoseTests/GildedRoseBrieTests.swift b/swift/Tests/GildedRoseTests/GildedRoseBrieTests.swift
new file mode 100644
index 00000000..0fdc0c4a
--- /dev/null
+++ b/swift/Tests/GildedRoseTests/GildedRoseBrieTests.swift
@@ -0,0 +1,21 @@
+//
+//  GildedRoseBrieTests.swift
+//  
+//
+//  Created by Murat Bataray on 09/02/2023.
+//
+
+@testable import GildedRose
+import XCTest
+
+class GildedRoseBrieTests: XCTestCase {
+    func test_updateQuality_agedBrieQuality_increasesInAgeAfterSellByDate() throws {
+        let items = [Item(name: "Aged Brie", sellIn: 1, quality: 4)]
+        let app = GildedRose(items: items)
+        app.updateQuality()
+        XCTAssertEqual(app.items[0].quality, 5)
+        app.updateQuality()
+        XCTAssertEqual(app.items[0].quality, 7)
+    }
+}
+
diff --git a/swift/Tests/GildedRoseTests/GildedRoseConjuredTests.swift b/swift/Tests/GildedRoseTests/GildedRoseConjuredTests.swift
new file mode 100644
index 00000000..7408d8e1
--- /dev/null
+++ b/swift/Tests/GildedRoseTests/GildedRoseConjuredTests.swift
@@ -0,0 +1,22 @@
+//
+//  GildedRoseConjuredTests.swift
+//  
+//
+//  Created by Murat Bataray on 09/02/2023.
+//
+
+@testable import GildedRose
+import XCTest
+
+class GildedRoseConjuredTests: XCTestCase {
+    func test_updateQuality_conjuredItemQuality_shouldDegradeTwiceAsFastAfterSellByDate() throws {
+        let items = [Item(name: "Conjured item", sellIn: 1, quality: 15)]
+        let app = GildedRose(items: items)
+        app.updateQuality()
+        XCTAssertEqual(app.items[0].quality, 13)
+        app.updateQuality()
+        XCTAssertEqual(app.items[0].quality, 9)
+    }
+}
+
+
diff --git a/swift/Tests/GildedRoseTests/GildedRoseSulfurasTests.swift b/swift/Tests/GildedRoseTests/GildedRoseSulfurasTests.swift
new file mode 100644
index 00000000..a65feb7c
--- /dev/null
+++ b/swift/Tests/GildedRoseTests/GildedRoseSulfurasTests.swift
@@ -0,0 +1,30 @@
+//
+//  GildedRoseSulfurasTests.swift
+//  
+//
+//  Created by Murat Bataray on 09/02/2023.
+//
+
+@testable import GildedRose
+import XCTest
+
+class GildedRoseSulfurasTests: XCTestCase {
+    func test_updateQuality_sulfurasQuality_shouldntHaveSellDate() throws {
+        let items = [Item(name: "Sulfuras, Hand of Ragnaros", sellIn: 0, quality: 1)]
+        let app = GildedRose(items: items)
+        app.updateQuality()
+        XCTAssertEqual(app.items[0].quality, 1)
+        app.updateQuality()
+        XCTAssertEqual(app.items[0].quality, 1)
+    }
+
+    func test_updateQuality_sulfurasQuality_shouldntDecreaseInQuality() throws {
+        let items = [Item(name: "Sulfuras, Hand of Ragnaros", sellIn: 1, quality: 1)]
+        let app = GildedRose(items: items)
+        app.updateQuality()
+        XCTAssertEqual(app.items[0].quality, 1)
+        app.updateQuality()
+        XCTAssertEqual(app.items[0].quality, 1)
+    }
+
+}
diff --git a/swift/Tests/GildedRoseTests/GildedRoseTests.swift b/swift/Tests/GildedRoseTests/GildedRoseTests.swift
index 62bde8f1..a19daa2d 100644
--- a/swift/Tests/GildedRoseTests/GildedRoseTests.swift
+++ b/swift/Tests/GildedRoseTests/GildedRoseTests.swift
@@ -2,10 +2,39 @@
 import XCTest
 
 class GildedRoseTests: XCTestCase {
-    func testFoo() throws {
-        let items = [Item(name: "foo", sellIn: 0, quality: 0)]
+    func test_updateQuality_itemSellIn_shouldDecreaseAfterCallingFunction() throws {
+        let items = [Item(name: "foo", sellIn: 5, quality: 5)]
         let app = GildedRose(items: items)
         app.updateQuality()
-        XCTAssertEqual(app.items[0].name, "foo")
+        XCTAssertEqual(app.items[0].quality, 4)
+        app.updateQuality()
+        XCTAssertEqual(app.items[0].quality, 3)
+    }
+    
+    func test_updateQuality_itemQuality_shouldDegradeTwiceAsFastAfterPassingSellByDate() throws {
+        let items = [Item(name: "foo", sellIn: 0, quality: 5)]
+        let app = GildedRose(items: items)
+        app.updateQuality()
+        XCTAssertEqual(app.items[0].quality, 3)
+        app.updateQuality()
+        XCTAssertEqual(app.items[0].quality, 1)
+    }
+    
+    func test_updateQuality_itemQuality_shouldntBecomeNegativeAfterPassingSellByDate() throws {
+        let items = [Item(name: "foo", sellIn: 0, quality: 1)]
+        let app = GildedRose(items: items)
+        app.updateQuality()
+        XCTAssertEqual(app.items[0].quality, 0)
+        app.updateQuality()
+        XCTAssertEqual(app.items[0].quality, 0)
+    }
+    
+    func test_updateQuality_itemQuality_shouldntGoAbove50() throws {
+        let items = [Item(name: "Aged Brie", sellIn: 1, quality: 49)]
+        let app = GildedRose(items: items)
+        app.updateQuality()
+        XCTAssertEqual(app.items[0].quality, 50)
+        app.updateQuality()
+        XCTAssertEqual(app.items[0].quality, 50)
     }
 }