public static Test suite() {
        TestSuite suite = new TestSuite("org.jfree.chart.urls");
        suite.addTestSuite(CustomCategoryURLGeneratorTests.class);
        suite.addTestSuite(CustomPieURLGeneratorTests.class);
        suite.addTestSuite(CustomXYURLGeneratorTests.class);
        suite.addTestSuite(StandardCategoryURLGeneratorTests.class);
        suite.addTestSuite(StandardPieURLGeneratorTests.class);
        suite.addTestSuite(StandardXYURLGeneratorTests.class);
        suite.addTestSuite(TimeSeriesURLGeneratorTests.class);
        return suite;