refactor gametest

src/main/java/ch/zhaw/pm2/racetrack/Game.java

@@ -290,7 +290,6 @@ public class Game implements GameSpecification {
      * If the car is passing the finishline in the correct direction, the car will gain a winpoint.
      * @param start the startposition of the car
      * @param finish the expected finishpositon of the car after the move
-     * @param carIndex of the current player.
      */
     private void calculateWinner(PositionVector start, PositionVector finish, int carIndex) {
         List<PositionVector> path = calculatePath(start, finish);

src/main/java/ch/zhaw/pm2/racetrack/Track.java

@@ -284,7 +284,7 @@ public class Track implements TrackSpecification {
             }
         }
 
-        return null;
+        return ConfigSpecification.SpaceType.WALL;
     }
 
     /**