    @Test
    public void addFreeShapeMarker() {

        final ChartMarkersParameter p = new ChartMarkersParameter();
        final Marker sm = Markers.newShapeMarker(Shape.CIRCLE, PERU, 13, Priority.LOW);
        p.addFreeMarker(sm, 10, 20);
        Logger.getLogger(Logger.GLOBAL_LOGGER_NAME).info(p.toURLParameterString());
        final String expectedString = "chm=@o,CD853F,0,0.1:0.2,13,-1";
        assertEquals("Junit error", expectedString, p.toURLParameterString());
    }