In this episode, we finish test-driving the functions responsible for starting and scoring the game.

To keep the Flow type internal to the module, we decided to create a public Game class representing the game state in play. A Game instance needs to be strongly referenced throughout the gameplay so we can appropriately deal with memory management and be ready to easily add new features, such as saving the current game state or stopping/halting the Quiz midways.

Moreover, we import the QuizEngine module to the QuizApp workspace and start test-driving the NavigationControllerRouter, a concrete implementation of the Router protocol for UIKit apps.

Finally, we reflect on which module should be responsible for creating the view controllers, an important decision that helps maintain our architecture clean and flexible.

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