protected void setUp() {
        this.chart = createChart();
    }

    /**
     * Draws the chart with a null info object to make sure that no exceptions 
     * are thrown (a problem that was occurring at one point).
     */
    public void testDrawWithNullInfo() {

        boolean success = false;
        try {
            BufferedImage image = new BufferedImage(200 , 100, 
                    BufferedImage.TYPE_INT_RGB);
            Graphics2D g2 = image.createGraphics();
            this.chart.draw(g2, new Rectangle2D.Double(0, 0, 200, 100), null, 
                    null);
            g2.dispose();
            success = true;
        }
        catch (Exception e) {
          success = false;
          e.printStackTrace();
        }
        assertTrue(success);

    }

    /**
     * Replaces the dataset and checks that it has changed as expected.
     */
    public void testReplaceDataset() {

        // create a dataset...
        XYSeries series1 = new XYSeries("Series 1");
        series1.add(10.0, 10.0);
        series1.add(20.0, 20.0);
        series1.add(30.0, 30.0);
        XYDataset dataset = new XYSeriesCollection(series1);

        LocalListener l = new LocalListener();
        this.chart.addChangeListener(l);
        
        XYPlot plot = (XYPlot) this.chart.getPlot();
        plot.setDataset(dataset);
        assertEquals(true, l.flag);
        ValueAxis axis = plot.getRangeAxis();
        Range range = axis.getRange();
        assertTrue("Expecting the lower bound of the range to be around 10: "
                   + range.getLowerBound(), range.getLowerBound() <= 10);
        assertTrue("Expecting the upper bound of the range to be around 30: "
                   + range.getUpperBound(), range.getUpperBound() >= 30);

    }

    /**
     * Check that setting a tool tip generator for a series does override the
     * default generator.
     */
    public void testSetSeriesToolTipGenerator() {
        XYPlot plot = (XYPlot) this.chart.getPlot();
        XYItemRenderer renderer = plot.getRenderer();
        StandardXYToolTipGenerator tt = new StandardXYToolTipGenerator();
        renderer.setSeriesToolTipGenerator(0, tt);
        XYToolTipGenerator tt2 = renderer.getToolTipGenerator(0, 0);
        assertTrue(tt2 == tt);