diff --git a/test/Pong/test_updateBallPosition.c b/test/Pong/test_updateBallPosition.c
index a5c98a6..73cb040 100644
--- a/test/Pong/test_updateBallPosition.c
+++ b/test/Pong/test_updateBallPosition.c
@@ -9,6 +9,18 @@ typedef struct {
     int speedY;
 } Ball;
 
+void updateBallPosition(Ball *ball) {
+    struct Ball {
+        int x;
+        int y;
+        int speedX;
+        int speedY;
+    };
+
+    ball->x += ball->speedX;
+    ball->y += ball->speedY;
+}
+
 void setUp(void){
     //Wenn Funktion Vorraussetzungen braucht
 }