Spring Boot controller test loading entire application context

Spring Boot here. I currently have the following REST controller:

@RestController
public class FizzbuzzController {

    private final FizzbuzzService FizzbuzzService;

    public FizzbuzzController(FizzbuzzService FizzbuzzService) {
        this.FizzbuzzService = FizzbuzzService;
    }

    @PostMapping("/Fizzbuzzs/{fizzbuzzId}")
    public ResponseEntity<FizzbuzzDTO> addFizzbuzz(@RequestParam("files") List<MultipartFile> files,
                                      @PathVariable String fizzbuzzId) throws IOException {

        FizzbuzzDTO fizzbuzzDTO = fizzbuzzService.store(files, fizzbuzzId);
        return ResponseEntity.status(HttpStatus.OK).body(fizzbuzzDTO);
        
    }

}

I would like to write an integration test for it that:

1. Mocks or stubs an HTTP request to the URL; and
2. Allows me to inject the FizzbuzzController (under test) with a mocked FizzbuzzService or the real thing; and
3. Allows me to inspect the HTTP response coming back from the method (check status code, check response entity, etc.)

My best attempt thus far:

@WebMvcTest(FizzbuzzController.class)
@EnableConfigurationProperties
@AutoConfigureMockMvc
public class FizzbuzzControllerTest {

    @Autowired
    private MockMvc mockMvc;

    @MockBean
    private FizzbuzzService FizzbuzzService;

    @Test
    public void should_store_fizzbuzz_files() throws Exception {
        // I can't even get the test to run
        assertTrue(1 == 1);
    }

}

When I run this, the test fails to run and it is clear (looking at the logs) that Spring is loading the entire application context of my app, whereas I just want it to isolate the context to this test class, the main FizzbuzzController class, and anything in the dependency tree underneath it.

Can anyone spot where I’m going awry?

Answer

You need another context for testing. I’m suggesting you to have a separate Test config:

@TestConfiguration
@Slf4j
@EnableJpaRepositories("tth.patientportal.repository")
public class TestConfig { // bean configs goes here for testing if you need to change 
  // context}

and in a controller test build the context like below:

@RunWith(SpringRunner.class)
@AutoConfigureTestEntityManager
@SpringBootTest
@TestPropertySource("classpath:application-unittest.properties")
@ContextConfiguration(classes = {TestConfig.class})    
public class RestControllerTest {
    @Autowired
    private WebApplicationContext webApplicationContext;
    private MockMvc mockMvc;

    @Before
    public void setup() 
    {
       mockMvc = MockMvcBuilders.
            webAppContextSetup(webApplicationContext)
            .build();
    }

    @Test
    public void shouldReturnRegisteredUser() throws Exception {
        this.mockMvc.
            perform(MockMvcRequestBuilders
                    .post("url")                        
                    .contentType(MediaType.APPLICATION_JSON)
                    .accept(MediaType.APPLICATION_JSON))
            .andExpect(status().isOk())
            .andExpect(MockMvcResultMatchers.jsonPath("$.username").exists());
    }

}