@Test
public void testDefaultSymbolizer() throws ParameterException {

        PointSymbolizer ps = new PointSymbolizer();
        MarkGraphic mg = (MarkGraphic) ps.getGraphicCollection().getGraphic(0);
        assertTrue(mg.getWkn().getValue(null, 0).equalsIgnoreCase("circle"));
        assertTrue(mg.getViewBox().getWidth().getValue(null, 0) == 3.0);
        assertTrue(mg.getUom() == Uom.MM);
        //We're dealing with the default symbolizer, so we obtain a MarKgraphic
        //where the UOM has been set to MM. Consequently, even if not
        //set from here, the own Uom of the MarkGraphic is not null.
        assertNotNull(mg.getOwnUom());
}