Spring MVC Test with Mockito

MockMvc

VetController

@Controller
public class VetController {

    private final ClinicService clinicService;


    @Autowired
    public VetController(ClinicService clinicService) {
        this.clinicService = clinicService;
    }

    @RequestMapping(value = { "/vets.html"})
    public String showVetList(Map model) {
        // Here we are returning an object of type 'Vets' rather than a collection of Vet objects
        // so it is simpler for Object-Xml mapping
        Vets vets = new Vets();
        vets.getVetList().addAll(this.clinicService.findVets());
        model.put("vets", vets);
        return "vets/vetList";
    }
}

VetControllerTest

@ExtendWith(MockitoExtension.class)
class VetControllerTest {

    @Mock
    ClinicService clinicService;

    @Mock
    Map model;

    @InjectMocks
    VetController controller;

    List vetsList = new ArrayList<>();

    MockMvc mockMvc;

    @BeforeEach
    void setUp() {
        vetsList.add(new Vet());

        given(clinicService.findVets()).willReturn(vetsList);

        mockMvc = MockMvcBuilders.standaloneSetup(controller).build();
    }

    @Test
    void testControllerShowVetList() throws Exception {
        mockMvc.perform(get("/vets.html"))
            .andExpect(status().isOk())
            .andExpect(model().attributeExists("vets"))
            .andExpect(view().name("vets/vetList"));
    }
}