Junit Session Test

[Alex Giovi]

How could I test this method in my controller:

@Controller
public class LoginController{
    @Autowired
    HttpSession session;

    @RequestMapping(value="/logout")
    public String logout(ModelMap model) {
        session.invalidate();
        return "logout-page";
    }
}

I tried with these codes, but I get a NullPointerException when invalidate the session.

public class loginControllerTest {
    @InjectMocks
    private LoginController loginController = new LoginController();

    @Autowired
    MockHttpSession session;

    @Before 
    public void setUp() {
        MockitoAnnotations.initMocks(this);
    }

    @Test
    public void Testlogout() throws Exception{
        request.setMethod("GET");
        request.setRequestURI("/logout");
        request.setSession(session);              
        ModelAndView modelAndView = handlerAdapter.handle(request, response,loginController);
        assertEquals("logout-page", modelAndView.getViewName());

    }
}

I've tried also this code:

@Test
public void TestLogout2() throws Exception {
    MvcResult result =     mockMvc.perform(MockMvcRequestBuilders.get("/logout")
      .session((MockHttpSession)session))
      .andExpect(MockMvcResultMatchers.status().isOk())
      .andDo(print())
      .andExpect(MockMvcResultMatchers.view().name("logout-page"))
      .andExpect(MockMvcResultMatchers.forwardedUrl("/logout-page"))
      .andReturn();  
    assertNotNull(result.getModelAndView());
}

Any help would be much appreciated

[Jayesh A Lalwani]

DO you get an exception? Can you post it? How are you getting the handlerAdapter?

[Alex Giovi]

Hi,
the handleradapter variable is of type "AnnotationMethodHandlerAdapter" which i declared after tha class declaration.
in both case i have a NPE as shown in the stacktrace below:

 org.springframework.web.util.NestedServletException: Request processing failed; nested exception is java.lang.NullPointerException
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:973)
	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:852)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:687)
	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:837)
	at org.springframework.test.web.servlet.TestDispatcherServlet.service(TestDispatcherServlet.java:62)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
	at org.springframework.mock.web.MockFilterChain$ServletFilterProxy.doFilter(MockFilterChain.java:170)
	at org.springframework.mock.web.MockFilterChain.doFilter(MockFilterChain.java:137)
	at org.springframework.test.web.servlet.MockMvc.perform(MockMvc.java:141)
	at org.controllers.MainControllerTest.LogoutTest(MainControllerTest.java:194)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
	at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
	at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:74)
	at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:83)
	at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:72)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:233)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:87)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
	at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
	at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:71)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:176)
	at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
	at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
Caused by: java.lang.NullPointerException
	at org.webStore.controllers.LoginController.logout(LoginController.java:251)   ==> which is line 08 in the mockup ( session.invalidate();  )
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:215)
	at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)
	at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:749)
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:689)
	at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:83)
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:938)
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:870)
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:961)
	... 38 more

[Jayesh A Lalwani]

Debug TestLogout2. You probably have MockHttpSession session set to null. Instead of

 @Autowired  
    MockHttpSession session; 

 
    MockHttpSession session = new MockHttpSession(); 

You don;t need spring to inject MockHttpSession because the spring container doesn't have an session. You just want to create a MockHttpSession

[Alex Giovi]

Thanks, i tried this , but still have the same error !
I know that session has a null value , but how can i inject a value to session from test method?