MouseWheelEvent wheelUp = new MouseWheelEvent(zs, 0, System
.currentTimeMillis(), 0, 100, 30, 0, false,
MouseWheelEvent.WHEEL_UNIT_SCROLL, -20, -20);
int value = zs.getValue();
zs.mouseWheelMoved(wheelUp);
assertTrue("scroll up reduce zoom " + value + " > " + zs.getValue()
+ " " + wheelUp.getPreciseWheelRotation(), value > zs
.getValue());
value = zs.getValue();