public void testCloning() {
        XYBoxAnnotation a1 = new XYBoxAnnotation(1.0, 2.0, 3.0, 4.0,
                new BasicStroke(1.2f), Color.red, Color.blue);
        XYBoxAnnotation a2 = null;
        try {
            a2 = (XYBoxAnnotation) a1.clone();
        }
        catch (CloneNotSupportedException e) {
            e.printStackTrace();
        }
        assertTrue(a1 != a2);
        assertTrue(a1.getClass() == a2.getClass());
        assertTrue(a1.equals(a2));