test: don't wait on game (when possible)

app/src/test/java/chess/PgnTest.java

@@ -30,6 +30,7 @@ public class PgnTest {
 		commandExecutor.addListener(new GameAdapter() {
 			@Override
 			public void onGameEnd() {
+				// does not work with this for some reason ...
 				synchronized (game) {
 					game.notifyAll();
 				}
@@ -85,17 +86,17 @@ public class PgnTest {
 
 			commandExecutor.close();
 
-			synchronized (game) {
-				game.notifyAll();
+			synchronized (this) {
+				notifyAll();
 			}
 
 		});
 
 		commandExecutor.executeCommand(new NewGameCommand());
 
-		synchronized (game) {
+		synchronized (this) {
 			try {
-				game.wait();
+				wait();
 			} catch (InterruptedException e) {
 				e.printStackTrace();
 			}