public void testEquals() {

        // default instances
        DeviationRenderer r1 = new DeviationRenderer();
        DeviationRenderer r2 = new DeviationRenderer();
        assertTrue(r1.equals(r2));
        assertTrue(r2.equals(r1));

        r1.setAlpha(0.1f);
        assertFalse(r1.equals(r2));
        r2.setAlpha(0.1f);
        assertTrue(r1.equals(r2));