- Adding Test cases for existing code

swift/Tests/GildedRoseTests/GildedRoseTests.swift

@@ -7,9 +7,181 @@ class GildedRoseTests: XCTestCase {
         let items = [Item(name: "foo", sellIn: 0, quality: 0)]
         let app = GildedRose(items: items);
         app.updateQuality();
-        XCTAssertEqual("fixme", app.items[0].name);
+        XCTAssertEqual("foo", app.items[0].name);
     }
 
+    // MARK: - Test Cases for Standard Items
+    func testStandardItemsForSellInDatePassed() {
+        let items = [ Item(name: "Elixir of the Mongoose", sellIn: 1, quality: 7),
+                      Item(name: "+5 Dexterity Vest", sellIn: 0, quality: 10)
+        ]
+        let app = GildedRose(items: items)
+        let days = 3
+        for _ in 0..<days {
+            app.updateQuality()
+        }
+        // sellIn value
+        XCTAssertEqual(-2, app.items[0].sellIn)
+        XCTAssertEqual(-3, app.items[1].sellIn)
+        
+        // quality value
+        XCTAssertEqual(2, app.items[0].quality) // Item degrades twice in quality after sell date passed
+        XCTAssertEqual(4, app.items[1].quality) // Quality never negative
+    }
+    
+    func testStandardItemsWithQualityBelowZero() {
+        let items = [Item(name: "+5 Dexterity Vest", sellIn: 3, quality: 1),
+                     Item(name: "Elixir of the Mongoose", sellIn: 0, quality: 1)]
+        let app = GildedRose(items: items)
+        let days = 2
+        for _ in 0..<days {
+            app.updateQuality()
+        }
+        // sellIn value
+        XCTAssertEqual(1, app.items[0].sellIn)
+        XCTAssertEqual(-2, app.items[1].sellIn)
+        
+        // quality value
+        XCTAssertEqual(0, app.items[0].quality) // Quality never negative
+        XCTAssertEqual(0, app.items[1].quality)
+    }
+    
+    func testStandardItemsForSellInDateNotPassed() {
+        let items = [
+            Item(name: "+5 Dexterity Vest", sellIn: 10, quality: 20),
+            Item(name: "Elixir of the Mongoose", sellIn: 5, quality: 7)]
+        let app = GildedRose(items: items)
+        let days = 2
+        for _ in 0..<days {
+            app.updateQuality()
+        }
+        // sellIn value
+        XCTAssertEqual(8, app.items[0].sellIn)
+        XCTAssertEqual(3, app.items[1].sellIn)
+        
+        // quality value
+        XCTAssertEqual(18, app.items[0].quality)
+        XCTAssertEqual(5, app.items[1].quality)
+    }
+    
+    // MARK: - Test Cases for Aged Brie Items
+    func testAgedBrieItems() {
+        let items = [
+            Item(name: "Aged Brie", sellIn: 10, quality: 20),
+            Item(name: "Aged Brie", sellIn: 2, quality: 0)]
+        
+        let app = GildedRose(items: items)
+        
+        let days = 2
+        for _ in 0..<days {
+            app.updateQuality()
+        }
+        
+        // sellIn value
+        XCTAssertEqual(8, app.items[0].sellIn)
+        XCTAssertEqual(0, app.items[1].sellIn)
+        
+        // quality value
+        XCTAssertEqual(22, app.items[0].quality)
+        XCTAssertEqual(2, app.items[1].quality)
+    }
+    
+    func testAgedBrieItemsWithQualityMoreThanFifty() {
+        let items = [Item(name: "Aged Brie", sellIn: 5, quality: 49)]
+        let app = GildedRose(items: items)
+        let days = 4
+        for _ in 0..<days {
+            app.updateQuality()
+        }
+        // sellIn value
+        XCTAssertEqual(1, app.items[0].sellIn)
+        
+        // quality value
+        XCTAssertEqual(50, app.items[0].quality) // Quality of Aged Brie Item cannot be more than 50
+    }
+    
+    // MARK: - Test Cases for Backstage Passes Items
+    func testBackstagePassesItems() {
+        let items = [
+            Item(name: "Backstage passes to a TAFKAL80ETC concert", sellIn: 15, quality: 20),
+            Item(name: "Backstage passes to a TAFKAL80ETC concert", sellIn: 6, quality: 30),
+            Item(name: "Backstage passes to a TAFKAL80ETC concert", sellIn: 7, quality: 28)]
+        
+        let app = GildedRose(items: items)
+        
+        let days = 6
+        for _ in 0..<days {
+            app.updateQuality()
+        }
+        
+        // sellIn value
+        XCTAssertEqual(9, app.items[0].sellIn)
+        XCTAssertEqual(0, app.items[1].sellIn)
+        XCTAssertEqual(1, app.items[2].sellIn)
+        
+        // quality value
+        XCTAssertEqual(27, app.items[0].quality)
+        XCTAssertEqual(47, app.items[1].quality)
+        XCTAssertEqual(44, app.items[2].quality)
+    }
+    
+    func testBackstagePassesItemAfterSellInDatePassed() {
+        let items = [
+            Item(name: "Backstage passes to a TAFKAL80ETC concert", sellIn: 5, quality: 49),
+            Item(name: "Backstage passes to a TAFKAL80ETC concert", sellIn: 4, quality: 30)]
+        
+        let app = GildedRose(items: items)
+        
+        let days = 6
+        for _ in 0..<days {
+            app.updateQuality()
+        }
+        
+        // sellIn value
+        XCTAssertEqual(-1, app.items[0].sellIn)
+        XCTAssertEqual(-2, app.items[1].sellIn)
+        
+        // quality value
+        XCTAssertEqual(0, app.items[0].quality) // Quality of Backstage passes item is 0 after the sell in date is passed
+        XCTAssertEqual(0, app.items[1].quality)
+    }
+    
+    func testBackstagePassesItemsWithQualityMoreThanFifty() {
+        let items = [ Item(name: "Backstage passes to a TAFKAL80ETC concert", sellIn: 10, quality: 49)]
+        let app = GildedRose(items: items)
+        let days = 3
+        for _ in 0..<days {
+            app.updateQuality()
+        }
+        // sellIn value
+        XCTAssertEqual(7, app.items[0].sellIn)
+        
+        // quality value
+        XCTAssertEqual(50, app.items[0].quality) // Quality of Backstage passes item cannot be more than 50
+    }
+
+    
+    // MARK: - Test Cases for Sulfuras Items
+    func testSulfurasItem() {
+        let items = [  Item(name: "Sulfuras, Hand of Ragnaros", sellIn: 0, quality: 80),
+                       Item(name: "Sulfuras, Hand of Ragnaros", sellIn: -1, quality: 80) ]
+        
+        let app = GildedRose(items: items)
+        
+        let days = 2
+        for _ in 0..<days {
+            app.updateQuality()
+        }
+        
+        // sellIn value
+        XCTAssertEqual(0, app.items[0].sellIn) // Sulfuras Item is never sold. No change in Sell In
+        XCTAssertEqual(-1, app.items[1].sellIn)
+        
+        // quality value
+        XCTAssertEqual(80, app.items[0].quality) // Sulfuras Item never changes the quality
+        XCTAssertEqual(80, app.items[1].quality)
+    }
+    
     static var allTests : [(String, (GildedRoseTests) -> () throws -> Void)] {
         return [
             ("testFoo", testFoo),