public void testCloning() {
        PaintScaleLegend l1 = new PaintScaleLegend(new GrayPaintScale(), 
                new NumberAxis("X"));
        PaintScaleLegend l2 = null;
        try {
            l2 = (PaintScaleLegend) l1.clone();
        }
        catch (CloneNotSupportedException e) {
            e.printStackTrace();
        }
        assertTrue(l1 != l2);
        assertTrue(l1.getClass() == l2.getClass());
        assertTrue(l1.equals(l2));