          movementX_log.innerHTML = movementX;
            movementY_log.innerHTML = movementY;
            movementX_sum_log.innerHTML = movementX_sum;
            movementY_sum_log.innerHTML = movementY_sum;
        }

        function run_test() {
            x = Math.round(window.innerWidth / 2);
            y = Math.round(window.innerHeight / 2);
            var actions = new test_driver.Actions();
            actions.pointerMove(x, y)
              .pointerDown()
              .pointerUp();
          