@Test
 public void testGetAllCourses() throws Exception {
   List<Course> courses = data.getAllCourses();
   for (Course c : courses) {
     System.out.println(c.toString());
     List<Section> sections = c.getSections();
     for (Section s : sections) {
       System.out.println("\t\t" + s.toString());
     }
   }
 }