Add some unit tests.

Author: luxorules

CardAnimationTests/CardAnimationTests.swift

@@ -21,16 +21,84 @@ class CardAnimationTests: XCTestCase {
         super.tearDown()
     }
 
-    func testExample() {
-        // This is an example of a functional test case.
-        // Use XCTAssert and related functions to verify your tests produce the correct results.
+    func testCallsToTheDelegate() {
+        let cardComponent = AnimatedCardsView(frame: CGRectMake(0, 0, 800, 800))
+        let dataSourceMock = DataSourceDelegateMock()
+        
+        cardComponent.dataSourceDelegate = dataSourceMock
+        
+        let visibleCount = dataSourceMock.numberOfVisibleCardsCallCount
+        let cardCount = dataSourceMock.numberOfCardsCallCount
+        XCTAssert(cardCount > 0, "numberOfCards delegate not called")
+        XCTAssert(visibleCount > 0, "numberOfVisibleCards delegate not called")
     }
 
-    func testPerformanceExample() {
-        // This is an example of a performance test case.
-        self.measureBlock {
-            // Put the code you want to measure the time of here.
-        }
+    func testComponentAsksForTheCorrectAmountOfData() {
+        let numberOfCards = 10, numberOfVisibleCards = 5
+        
+        let cardComponent = AnimatedCardsView(frame: CGRectMake(0, 0, 800, 800))
+        let dataSourceMock = DataSourceDelegateMock()
+        dataSourceMock.numberOfCardsValue = numberOfCards
+        dataSourceMock.numberOfVisibleCardsValue = numberOfVisibleCards
+        
+        cardComponent.dataSourceDelegate = dataSourceMock
+        
+        let visibleCount = dataSourceMock.numberOfVisibleCardsCallCount
+        let cardCount = dataSourceMock.numberOfCardsCallCount
+        XCTAssert(cardCount == 1, "wrong number of calls to numberOfCards delegate")
+        XCTAssert(visibleCount == 1, "wrong number of calls to numberOfVisibleCards delegate")
+        XCTAssert(numberOfVisibleCards == dataSourceMock.cardNumberCallCount, "wrong number of calls to cardNumber delegate")
     }
 
+    func testReloadDataAsksAgainForAllTheData() {
+        let cardComponent = AnimatedCardsView(frame: CGRectMake(0, 0, 800, 800))
+        let dataSourceMock = DataSourceDelegateMock()
+        
+        cardComponent.dataSourceDelegate = dataSourceMock
+        
+        let visibleCount = dataSourceMock.numberOfVisibleCardsCallCount
+        let cardCount = dataSourceMock.numberOfCardsCallCount
+
+        cardComponent.reloadData()
+        
+        XCTAssert(cardCount == dataSourceMock.numberOfCardsCallCount/2, "not the same number of calls to the numberOfCards delegate")
+        XCTAssert(visibleCount == dataSourceMock.numberOfVisibleCardsCallCount/2, "not the same number of calls to the numberOfVisibleCards delegate")
+    }
+    
+    func testChangeOfSizeReloadsData() {
+        let cardComponent = AnimatedCardsView(frame: CGRectMake(0, 0, 800, 800))
+        let dataSourceMock = DataSourceDelegateMock()
+        
+        cardComponent.dataSourceDelegate = dataSourceMock
+        
+        let visibleCount = dataSourceMock.numberOfVisibleCardsCallCount
+        let cardCount = dataSourceMock.numberOfCardsCallCount
+        
+        cardComponent.cardSize = (100,100)
+        
+        XCTAssert(cardCount == dataSourceMock.numberOfCardsCallCount/2, "not the same number of calls to the numberOfCards delegate")
+        XCTAssert(visibleCount == dataSourceMock.numberOfVisibleCardsCallCount/2, "not the same number of calls to the numberOfVisibleCards delegate")
+    }
+    
+}
+
+class DataSourceDelegateMock : AnimatedCardsViewDataSource {
+    var numberOfVisibleCardsValue = 10, numberOfVisibleCardsCallCount = 0
+    func numberOfVisibleCards() -> Int {
+        numberOfVisibleCardsCallCount++
+        return numberOfVisibleCardsValue
+    }
+    
+    var numberOfCardsValue = 5, numberOfCardsCallCount = 0
+    func numberOfCards() -> Int {
+        numberOfCardsCallCount++
+        return numberOfCardsValue
+    }
+    
+    var cardNumberCallCount = 0, cacheMiss = 0, cacheHit = 0
+    func cardNumber(number:Int, view:BaseCardView?) -> BaseCardView {
+        cardNumberCallCount++
+        view != nil ? cacheHit++ : cacheMiss++
+        return BaseCardView(frame: CGRectMake(0, 0, 10, 10))
+    }
 }