[FIXED] MockMvc is null when testing the Web Layer

Issue

I have this MvcTest in my application:

@SpringBootTest
@WebMvcTest
public class BarsControllerTest {

    @Autowired
    private MockMvc mockMvc;



    @Test
    public void testBars() throws Exception {

        mockMvc.perform(get("/bars")
                .contentType(MediaType.APPLICATION_JSON_UTF8_VALUE))
                .andExpect(status().isOk())
                .andExpect(jsonPath("$.*", hasSize(1)));
    }
}

but when I run the test mockMvc is null when running the tests.

Solution

You shouldn't use @WebMvcTest and @SpringBootTest together.

If you want to test both web layer and other layers Use @AutoConfigureMockMvc and @SpringBootTest together:

@SpringBootTest
@AutoConfigureMockMvc
public class BarsControllerTest {

    @Autowired
    private MockMvc mockMvc;



    @Test
    public void testBars() throws Exception {

        mockMvc.perform(get("/bars")
                .contentType(MediaType.APPLICATION_JSON_UTF8_VALUE))
                .andExpect(status().isOk())
                .andExpect(jsonPath("$.*", hasSize(1)));
    }
}

Or if you only want to test web layer you can use just @WebMvcTest: note the this does not load full spring application context(It only loads web layer)

@WebMvcTest
public class BarsControllerTest {

    @Autowired
    private MockMvc mockMvc;



    @Test
    public void testBars() throws Exception {

        mockMvc.perform(get("/bars")
                .contentType(MediaType.APPLICATION_JSON_UTF8_VALUE))
                .andExpect(status().isOk())
                .andExpect(jsonPath("$.*", hasSize(1)));
    }
}

Answered By - Tashkhisi
Answer Checked By - Marie Seifert (JavaFixing Admin)