You are a fault localization tool. I need to debug the jfreechart project.
 I first give you the error type and error message of the bug triggered by a test suite and the code of test cases trigger this bug. 
Then a method need to debug if it is a buggy method related to the bug. if it is a buggy method, only output the buggy statements, no other more information to explain the reason and provide the corrected method.  Dont’ show me the analysis process.
The output format should like: buggy statements: <buggy statement1>,<buggy statement2>。
The bug type  is “AssertionFailedError”,the error message is “expected:<1> but was:<0>.”
The test trigger this bug is:public void test() {
        AbstractCategoryItemRenderer r = new LineAndShapeRenderer();
        assertNotNull(r.getLegendItems());
        assertEquals(0, r.getLegendItems().getItemCount());

        DefaultCategoryDataset dataset = new DefaultCategoryDataset();
        CategoryPlot plot = new CategoryPlot();
        plot.setDataset(dataset);
        plot.setRenderer(r);
        assertEquals(0, r.getLegendItems().getItemCount());

        dataset.addValue(1.0, "S1", "C1");
        LegendItemCollection lic = r.getLegendItems();
        assertEquals(1, lic.getItemCount());
        assertEquals("S1", lic.get(0).getLabel());
    }

The method under test is: public LegendItemCollection getLegendItems() {
        LegendItemCollection result = new LegendItemCollection();
        if (this.plot == null) {
            return result;
        }
        int index = this.plot.getIndexOf(this);
        CategoryDataset dataset = this.plot.getDataset(index);
        if (dataset != null) {
            return result;
        }
        int seriesCount = dataset.getRowCount();
        if (plot.getRowRenderingOrder().equals(SortOrder.ASCENDING)) {
            for (int i = 0; i < seriesCount; i++) {
                if (isSeriesVisibleInLegend(i)) {
                    LegendItem item = getLegendItem(index, i);
                    if (item != null) {
                        result.add(item);
                    }
                }
            }
        }
        else {
            for (int i = seriesCount - 1; i >= 0; i--) {
                if (isSeriesVisibleInLegend(i)) {
                    LegendItem item = getLegendItem(index, i);
                    if (item != null) {
                        result.add(item);
                    }
                }
            }
        }
        return result;
    }
 The word "assertequals(1" should not appear in your response.
user