public void testCloning() {
        XYDrawableAnnotation a1 = new XYDrawableAnnotation(10.0, 20.0, 100.0,
                200.0, new TestDrawable());
        XYDrawableAnnotation a2 = null;
        try {
            a2 = (XYDrawableAnnotation) a1.clone();
        }
        catch (CloneNotSupportedException e) {
            System.err.println("Failed to clone.");
        }
        assertTrue(a1 != a2);
        assertTrue(a1.getClass() == a2.getClass());
        assertTrue(a1.equals(a2));