在HttpSession上部分模拟 [英] Partial Mocking on HttpSession

问题描述

有一个我要测试的servlet，servlet进行了会话，并将"loginBean"(包含已登录的用户相关信息)放入会话中，我已经对其进行了模拟并且可以正常工作，现在在GUI级别上，有2个选项卡，DetailSet1，detailsS​​et2，当您输入DetailSet1的数据时，它会保存在会话中，并且还会执行一些业务逻辑，现在是DetailsS​​et2，您已经在会话中有了DetailSet1，因此它获取了所有需要的数据，并将数据保存在DB中.现在很明显，我必须模拟HttpSession，因为我是从容器外部运行单元箱，但是要存储的数据也存储在HttpSession中，如果我也模拟了它们，那么就无法达到测试的目的.所以我的问题是，我需要HttpSession对象来返回模拟数据，以模拟所要模拟的数据，并且在其他情况下，它应该像任何普通的HttpSession对象一样工作.像，如果代码执行session.setAttribute("name","Vivek")，则session.getAttribute("name")之后应该返回"Vivek"，但是如果是模拟对象，为什么返回"NULL"呢?因为我还没有嘲笑"getAttribute("name")"的行为.

There is a servlet i want to test , servlet have session and puts "loginBean" (which contain logged in user related info) inside session , which i have mocked already and working fine , now IN GUI level , there are 2 tab , DetailSet1 , detailsSet2 , when u enter data of DetailSet1 , it get saved in session and also does some business logic , now it comes to DetailsSet2 , you already have DetailSet1 in session , so it got all it needs , data is saved in DB. Now it's obvious i have to mock HttpSession because i am running unit cases from outside the container , but data which gets stored is also in HttpSession , if i mock those as well , it defeats the purpose of testing. so my Question is , i need HttpSession object to return mocked data for what i have it mocked for and it is suppose to act like any normal HttpSession object for other cases. Like , if code does session.setAttribute("name","Vivek") , then session.getAttribute("name") should return "Vivek" after that , but in case of mocked object it return "NULL" why? because i haven't mocked behaviour for "getAttribute("name").

简单来说就是HttpSession或接口的部分模拟.

In simple word Partial mocking for HttpSession or Interfaces.

推荐答案

HttpSession是一个接口，因此您需要编写自己的实现或模拟它.我建议使用Mockito模拟它，然后将getAttribute和setAttribute存根以委派给HashMap或其他合适的结构.

HttpSession is an interface, so you'll need to either write your own implementation of it, or mock it. I would recommend mocking it with Mockito, then stubbing getAttribute and setAttribute to delegate to a HashMap, or some other suitable structure.

因此，在您的测试课程中，您将拥有

So in your test class, you'll have fields for

• 您嘲笑的HttpSession
• 真实的HashMap<String,Object>

• your mocked HttpSession,
• a real HashMap<String,Object>

，您将对getAttribute和setAttribute的每个对象使用Answer<Object>对象.每个Answer都只会将呼叫委托给HashMap.

and you'll use Answer<Object> objects for each of getAttribute and setAttribute. Each Answer will just delegate the call off to the HashMap.

您可以使用@Before方法或像这样的@Test方法进行所有设置.

You could set all this up either in a @Before method, or in a @Test method like this.

@Mock private HttpSession mockHttpSession;
Map<String,Object> attributes = new HashMap<String,Object>();

@Test
public void theTestMethod() {

    Mockito.doAnswer(new Answer<Object>(){
        @Override
        public Object answer(InvocationOnMock invocation) throws Throwable {
            String key = (String) invocation.getArguments()[0];
            return attributes.get(key);
        }
    }).when(mockHttpSession).getAttribute(anyString());

    Mockito.doAnswer(new Answer<Object>(){
        @Override
        public Object answer(InvocationOnMock invocation) throws Throwable {
            String key = (String) invocation.getArguments()[0];
            Object value = invocation.getArguments()[1];
            attributes.put(key, value);
            return null;
        }
    }).when(mockHttpSession).setAttribute(anyString(), any());

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