使用JSON输出执行集成测试时出错

下面是我在控制器中的操作。我试图通过集成测试来测试此操作。这也需要我模拟会话对象。我已经开始了集成测试，但是没有成功

def listData= {

    def playerId=session["playerId”]    

    tuneInstanceList = tuneService.calculateId(playerId)


    def listResult = [total: tuneInstanceList.size(), items: tuneInstanceList]

    render listResult as JSON;

}

下面是我的服务类中的CalculateId方法：

List<Tune> calculateId(String playerId) {              

   try{ 
   //read the sql file  
        String playerSql = grailsApplication.mainContext.getResource('classpath:'     +         Constants.PLAYER_FILE).inputStream.text  

def sql = new groovy.sql.Sql(dataSource)                  

def params = [playerId:playerId]  
def tuneInstanceList = new ArrayList<Tune>()  

def results = sql.rows(playerSql, params)  

tuneInstanceList = results.each {  
    def tune = new Tune()  
    tune.setPlayerId  it.player_id    
    tuneInstanceList.add tune 
} 
return tuneInstanceList 

 }catch (Exception ex) { 
    log.error ex.message, ex 
    throw ex 
} 
//finally { 
    //sql.close() 
//} 

当我运行测试时，我得到以下错误

无法获取null对象上的属性“request”

java.lang.NullPointerException:无法获取null对象上的属性“request”

---

想法？？？

为这个场景设计了测试用例。下面是代码。谢谢

public void testJSONQuery () {   
  def tuneController = new TuneController()
  tuneController.request.contentType = "text/csv"
  tuneController.tuneService = tuneService  
  tuneController.session["playerId"]='AF67H'    
  tuneController.listData()
  String tuneJSON = tuneController.response.contentAsString

  log.info ('Number of Records on execution of query is' + tuneJSON.substring(9,10))


 //Checks if the record count is greater than zero
  assertTrue (new Integer(tuneJSON.substring(9,10)).intValue() > 0)

}

---

制定了此场景的测试用例。下面是代码。谢谢

public void testJSONQuery () {   
  def tuneController = new TuneController()
  tuneController.request.contentType = "text/csv"
  tuneController.tuneService = tuneService  
  tuneController.session["playerId"]='AF67H'    
  tuneController.listData()
  String tuneJSON = tuneController.response.contentAsString

  log.info ('Number of Records on execution of query is' + tuneJSON.substring(9,10))


 //Checks if the record count is greater than zero
  assertTrue (new Integer(tuneJSON.substring(9,10)).intValue() > 0)

}