Spring mvc unit test controller inject dao object using mockito

Question

When using mockito to unit test Spring mvc controller, how to inject dao layer object. It's always giving null pointer exception with @Spy annotation when making use of SpringJUnit4ClassRunner class.

Sample code:

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = { "classpath:**/evivecare-application-context-test.xml" })
@WithMockUser(username = "admin", roles={"ADMIN"})
@TestExecutionListeners({DependencyInjectionTestExecutionListener.class})
public class ControllerTest {

    private MockMvc mockMvc;
     @Mock
     private SessionFactory sessionFactory;
     @Mock
     private Session session;
    @InjectMocks
    private FilterController filterController = new FilterController();
    @Spy
    private FilterService filterService= new FilterServiceImpl();
    @Autowired
    private FilterDAO filterDAO;
    @Mock
    private OperatorService userService;
    @Mock
    private EviveSpeechFilterService eviveSpeechFilterService;
    private TestContextManager testContextManager;



    @Before
    public void setup() throws Exception {
        // Process mock annotations
        MockitoAnnotations.initMocks(this);

        // Setup Spring test in standalone mode
        this.mockMvc = MockMvcBuilders.standaloneSetup(filterController).build();
        testContextManager = new TestContextManager(getClass());
        testContextManager.prepareTestInstance(this);

        filterDAO= new FilterDAOImpl(sessionFactory);
        Mockito.doReturn(session).when(sessionFactory).getCurrentSession();
    }

@Test
    public void testController200() throws Exception{
        Mockito.when(filterService.renameList("123","sdfgh")).thenReturn(false);
        Mockito.when(filterDAO.renameList("123","sdfgh")).thenReturn(false);
        this.mockMvc.perform(org.springframework.test.web.servlet.request.MockMvcRequestBuilders.post("/renameList")
                .sessionAttr("filterService", filterService)
                .sessionAttr("filterDAO", filterDAO)
                .param("listId", "1234567")
                .param("alternateName", "LIst Name"))
        .andExpect(org.springframework.test.web.servlet.result.MockMvcResultMatchers.status().isOk());
    }
}

In this test case, the filterService in turn calls filterDAO, which is always returning null pointer exception. So, what can I do to resolve this issue?

Please post the some code samples. Also why are you using `@Spy` and not `@Mock`? — Sergii Bishyr, May 30 '17 at 08:41

score 0 · Answer 1 · answered May 30 '17 at 10:26

FilterService is not a managed bean, you probably need to inject the dao in the constructor since it won't be autowired inside filterService.

Please refer to this question on SO for more info: Support for autowiring in a class not instantiated by spring (3)

Spring mvc unit test controller inject dao object using mockito

1 Answers1