a1.setLabelInsets(new RectangleInsets(10.0, 10.0, 10.0, 10.0));
        assertFalse(a1.equals(a2));
        a2.setLabelInsets(new RectangleInsets(10.0, 10.0, 10.0, 10.0));
        assertTrue(a1.equals(a2));

        // label angle...
        a1.setLabelAngle(1.23);
        assertFalse(a1.equals(a2));