### Question:
Game { public String getId() { return id.toString(); } Game(GameEngine gameEngine, Player player1, Player player2);  Game(GameEngine gameEngine, Set<Player> players); void play(Player player); String getId(); boolean isFinished(); Optional<Player> findWinner();  }### Answer:
@Test public void shouldReturnId() { Weapons weapons = new RockPaperScissorsWeapons(); GameEngine engine = new GameEngine(weapons); Game game = new Game(engine, mock(HumanPlayer.class), mock(HumanPlayer.class)); assertNotNull(game.getId()); }