- Implemented saving and loading of a player model. High scores are now persistent, though only for one user.

- Created a JUnit test class to test the serialization. Should be useful for later tests.

src/model/Referee.java

@@ -28,14 +28,14 @@ public class Referee implements Runnable {
 
 	private final HumanPlayer humanPlayer = new HumanPlayer();
 	private final MainFrame mf;
-	private final PlayerModel playerModel;
+	private PlayerModel playerModel = null;
 
 	public Referee(MainFrame mnFrm) {
 		if (PlayerModel.TRY_LOAD && PlayerModel.exists()) {
 			playerModel = PlayerModel.load();
 		}
 
-		else {
+		if (playerModel == null) {
 			playerModel = new PlayerModel();
 		}
 
@@ -84,6 +84,11 @@ public class Referee implements Runnable {
 			mf.updateBoard();
 			play();
 			playerModel.logGame(getPlayerScore());
+
+			if (!playerModel.save()) {
+				System.err.println("Saving PlayerModel failed.");
+			}
+
 			new HighScoreDialog(mf, playerModel);
 		}
 	}