Adding Test cases for Conjured Items

swift/Tests/GildedRoseTests/GildedRoseTests.swift

@@ -182,6 +182,71 @@ class GildedRoseTests: XCTestCase {
         XCTAssertEqual(80, app.items[1].quality)
     }
     
+    // MARK: -Test Cases for Conjured Items
+    
+    func testConjuredItems() {
+        let items = [
+            Item(name: "Conjured Mana Cake", sellIn: 3, quality: 50),
+            Item(name: "Conjured Mana Cake", sellIn: 2, quality: 3)]
+        
+        let app = GildedRose(items: items)
+        
+        let days = 2
+        for _ in 0..<days {
+            app.updateQuality()
+        }
+        
+        // sellIn value
+        XCTAssertEqual(1, app.items[0].sellIn)
+        XCTAssertEqual(0, app.items[1].sellIn)
+        
+        // quality value
+        XCTAssertEqual(46, app.items[0].quality)
+        XCTAssertEqual(0, app.items[1].quality)
+    }
+    
+    func testConjuredItemsAfterSellInDatePassed() {
+        let items = [ Item(name: "Conjured Mana Cake", sellIn: 0, quality: 25),
+                      Item(name: "Conjured Mana Cake", sellIn: 1, quality: 27),
+        ]
+        
+        let app = GildedRose(items: items)
+        
+        let days = 2
+        for _ in 0..<days {
+            app.updateQuality()
+        }
+        
+        // sellIn value
+        XCTAssertEqual(-2, app.items[0].sellIn)
+        XCTAssertEqual(-1, app.items[1].sellIn)
+        
+        // quality value
+        XCTAssertEqual(17, app.items[0].quality) //Quality of Conjured Items degrade twice as normal item
+        XCTAssertEqual(21, app.items[1].quality)
+    }
+    
+    func testConjuredItemsWithQualityBelowZero() {
+        let items = [ Item(name: "Conjured Mana Cake", sellIn: 1, quality: 2),
+                            Item(name: "Conjured Mana Cake", sellIn: -1, quality: 3),
+              ]
+              
+              let app = GildedRose(items: items)
+              
+              let days = 2
+              for _ in 0..<days {
+                  app.updateQuality()
+              }
+              
+              // sellIn value
+              XCTAssertEqual(-1, app.items[0].sellIn)
+              XCTAssertEqual(-3, app.items[1].sellIn)
+              
+              // quality value
+              XCTAssertEqual(0, app.items[0].quality) //Quality of Conjured Items cannot be negative
+              XCTAssertEqual(0, app.items[1].quality)
+    }
+    
     static var allTests : [(String, (GildedRoseTests) -> () throws -> Void)] {
         return [
             ("testFoo", testFoo),