Update Unit Test Snake

src/test/java/SnakeTest.java

@@ -43,6 +43,12 @@ class SnakeTest {
         assertEquals(new Point(gridSize / 2 + 1, gridSize / 2 - 1), bodySegments.get(0));
         assertEquals(new Point(gridSize / 2, gridSize / 2 - 1), bodySegments.get(1));
 
+        snake.setDirection(Snake.SnakeDirection.DOWN);
+        snake.update();
+        bodySegments = snake.getBodySegments();
+        assertEquals(new Point(gridSize / 2 + 1, gridSize / 2), bodySegments.get(0));
+        assertEquals(new Point(gridSize / 2 + 1, gridSize / 2 - 1), bodySegments.get(1));
+
     }