public void testEquals() {
        XYLine3DRenderer r1 = new XYLine3DRenderer();
        XYLine3DRenderer r2 = new XYLine3DRenderer();
        assertEquals(r1, r2);

        r1.setXOffset(11.1);
        assertFalse(r1.equals(r2));
        r2.setXOffset(11.1);
        assertTrue(r1.equals(r2));

        r1.setYOffset(11.1);
        assertFalse(r1.equals(r2));
        r2.setYOffset(11.1);
        assertTrue(r1.equals(r2));

        r1.setWallPaint(new GradientPaint(1.0f, 2.0f, Color.red, 3.0f,
                4.0f, Color.blue));
        assertFalse(r1.equals(r2));
        r2.setWallPaint(new GradientPaint(1.0f, 2.0f, Color.red, 3.0f,
                4.0f, Color.blue));
        assertTrue(r1.equals(r2));