refactoring: ballstruktur

test/Pong/test_updateBallPosition.c

@@ -18,7 +18,11 @@ void tearDown(void){
 
 void test_updateBallPosition(void){
     /* arrange */
-    Ball ball = { 10, 10, 1, 1 };
+    Ball ball;
+    ball.x = 10;
+    ball.y = 10;
+    ball.speedX = 1;
+    ball.speedY = 1;
     int expectedX = ball.x + ball.speedX * 5; // erwartete Endposition nach 5 Schritten
     int expectedY = ball.y + ball.speedY * 5;