Junit测试5（异常）

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佩德罗·马丁内斯（Pedro Martinez）：

我正在做Junit测试，在其中一项测试中，我遇到了问题，但我不明白为什么。

您不必在任何给定时间允许将更多对象添加到列表中，列表的大小大于5，总之，如果我将第六个对象添加到列表中，则必须跳过该异常，但是我不明白为什么它不起作用的原因，我留下了我正在做的代码。

码：

 @Test
 void testAddTank() throws KeeperException, TankException {  
  List<Tank> NumTanques = new ArrayList<Tank>();

  Tank tank1 = new Tank("TANQUE1","pedro1","hola",3.0,2.0,1.0,"/image",17.0,7);
  Tank tank2 = new Tank("TANQUE2","pedro2","hola",3.0,2.0,1.0,"/image",17.0,7);
  Tank tank3 = new Tank("TANQUE3","pedro3","hola",3.0,2.0,1.0,"/image",17.0,7);
  Tank tank4 = new Tank("TANQUE4","pedro4","hola",3.0,2.0,1.0,"/image",17.0,7);
  Tank tank5 = new Tank("TANQUE5","pedro5","hola",3.0,2.0,1.0,"/image",17.0,7);
  Tank tank6 = new Tank("TANQUE6","pedro6","hola",3.0,2.0,1.0,"/image",17.0,7);
  Tank tank7 = new Tank("TANQUE7","pedro6","hola",3.0,2.0,1.0,"/image",17.0,7);

  NumTanques.add(tank1);
  NumTanques.add(tank2);
  NumTanques.add(tank3);
  NumTanques.add(tank4);
  NumTanques.add(tank5);

  assertEquals(5, NumTanques.size());

  KeeperException excepcionTanques = assertThrows(KeeperException.class,()->NumTanques.add(tank6));
  assertEquals("[ERROR] A keeper cannot care of more than 5 
  thanks!!",excepcionTanques.MSG_ERR_MAX_TANKS);

}

如您所见，我创建了tank类型的列表并创建了一些tank对象，并将其添加到列表中。然后用断言我告诉你的是5必须是列表的大小，以便它返回true ...

然后，在我创建的异常中，我向列表中添加了一个新的tank，该异常应该跳转，但是没有跳转，它退出并在行上给出错误：

 KeeperException excepcionTanques = assertThrows(KeeperException.class,()->NumTanques.add(tank6));

我不清楚发生了什么。

Kunal Vohra：

Arraylist如果添加任何内容，为什么会抛出异常。它有自己的算法来管理加法。

您需要做的是在service类中添加一个方法（也许KeeperService.java）

并在那里抛出异常。就像是

@sneakyThrows
public void countKeeperCheck(Object o){

List<Tank> NumTanques = new ArrayList<Tank>();
NumTanques.add(o);

if(listOfBanks.size() >5){
throw new KeeperException("write whatever here")
}
}

//add to try/catch if you have specific things to handle

您可以从测试中调用该方法。您不能在测试中编写业务逻辑。从测试中，您调用保存业务逻辑的方法。

----------------在注释后编辑和详细代码-----------------

public void addTank(List<Tank> tank) throws KeeperException{// in the comment you add wrong signature, method should accept List, the only you will have contains operation

        if(tanks.size()>=5){
        throw new KeeperException(KeeperException.MSG_ERR_MAX_TANKS);
        }

        if(!tanks.contains(tank)){
            tanks.add(tank);
    }
}


// and this is how your test will look like
@Test
 void testAddTank() throws KeeperException, TankException {
         List<Tank> NumTanques = new ArrayList<Tank>();

        Tank tank1 = new Tank("TANQUE1","pedro1","hola",3.0,2.0,1.0,"/image",17.0,7);
        Tank tank2 = new Tank("TANQUE2","pedro2","hola",3.0,2.0,1.0,"/image",17.0,7);
        Tank tank3 = new Tank("TANQUE3","pedro3","hola",3.0,2.0,1.0,"/image",17.0,7);
        Tank tank4 = new Tank("TANQUE4","pedro4","hola",3.0,2.0,1.0,"/image",17.0,7);
        Tank tank5 = new Tank("TANQUE5","pedro5","hola",3.0,2.0,1.0,"/image",17.0,7);
        Tank tank6 = new Tank("TANQUE6","pedro6","hola",3.0,2.0,1.0,"/image",17.0,7);

        NumTanques.add(tank1);
        NumTanques.add(tank2);
        NumTanques.add(tank3);
        NumTanques.add(tank4);
        NumTanques.add(tank5);


        KeeperException excepcionTanques = assertThrows(KeeperException.class,()->yourServiceClass.addTank(tank6));
        assertEquals("[ERROR] A keeper cannot care of more than 5  thanks!!",excepcionTanques.MSG_ERR_MAX_TANKS);
        }

声明YourServiceClass您想要的方式。

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