- Add failing test test_startGame_answerZeroOutOfTwoCorrectly_scoresZ…

…ero()

- Create scoring function to calculate the score
- Use the scoring function inside the startGame()

EDGameEngine/Game.swift

@@ -15,9 +15,13 @@ public class Game<Question, Answer:Equatable, R:Router> where R.Question == Ques
     }
 }
 
-public func startGame<Question, Answer:Equatable, R:Router>(questions:[Question], router: R, answers:[Question:Answer]) -> Game<Question, Answer, R> where R.Question == Question, R.Answer == Answer {
-    let flow = Flow(questions: questions, router: router, scoring: { _ in 1})
+public func startGame<Question, Answer:Equatable, R:Router>(questions:[Question], router: R, correctAnswers:[Question:Answer]) -> Game<Question, Answer, R> where R.Question == Question, R.Answer == Answer {
+    let flow = Flow(questions: questions, router: router, scoring: { scoring($0, correctAnswers: correctAnswers) })
     flow.start() // at this point, the GameTests will crash because the flow is instantiated and removed right away from memory without anything holding it
     // And that is why we should create something that holds the flow variable without exposing it's methods and stuff
     return Game(flow: flow)
 }
+
+private func scoring<Question:Hashable, Answer:Equatable>(_ answers:[Question:Answer], correctAnswers:[Question:Answer]) -> Int {
+    return 1
+}

EDGameEngineTests/GameTests.swift

@@ -15,11 +15,21 @@ class GameTests:XCTestCase {
     // Here we want to start testing if the game scoring function is running correctly,
     // and we start out by calculating two questions with one answer correct
     // we simulate the startGame function and also simulate the answer with router answercallback
-    func test_startGame_answerOneOutOfTwoCorrectly_scores1() {
+    func test_startGame_answerOneOutOfTwoCorrectly_scoresOne() {
         let router = RouterSpy()
-        let game = startGame(questions: ["Q1", "Q2"], router: router, answers: ["Q1":"A1", "Q2":"A2"])
+        game = startGame(questions: ["Q1", "Q2"], router: router, correctAnswers: ["Q1":"A1", "Q2":"A2"])
         router.answerCallback("A1")
         router.answerCallback("wrong answer")
         XCTAssertEqual(router.routedResult!.score, 1)
     }
+
+    // Because we hardcoded the score on the first test, we add another test to check for the scoring function
+    // In this stage, we will create the scoring method to really calculate the score
+    func test_startGame_answerZeroOutOfTwoCorrectly_scoresZero() {
+        let router = RouterSpy()
+        game = startGame(questions: ["Q1", "Q2"], router: router, correctAnswers: ["Q1":"A1", "Q2":"A2"])
+        router.answerCallback("wrong answer")
+        router.answerCallback("wrong answer")
+        XCTAssertEqual(router.routedResult!.score, 0)
+    }
 }