public static Test suite() {
        TestSuite suite = new TestSuite("org.jfree.data.gantt");
        suite.addTestSuite(SlidingGanttCategoryDatasetTests.class);
        suite.addTestSuite(TaskTests.class);
        suite.addTestSuite(TaskSeriesTests.class);
        suite.addTestSuite(TaskSeriesCollectionTests.class);
        return suite;