/** Test of getInstance method, of class QuestionManager. */
 public void testGetInstance() {
   System.out.println("getInstance");
   QuestionManager expResult = QuestionManager.getInstance();
   assertNotNull(expResult);
   QuestionManager result = QuestionManager.getInstance();
   assertEquals(expResult, result);
 }
 private QuestionManager getQuestionManager() {
   if (questionManager == null) {
     questionManager = QuestionManager.getInstance();
   }
   return questionManager;
 }