我正在处理Spring MVC + Mockito，我已经开发了下面的代码，这是导致错误的原因，不确定是什么错误。

import static org.mockito.Mockito.verifyNoMoreInteractions;
import static org.mockito.Mockito.when;
import static org.springframework.test.web.client.match.MockRestRequestMatchers.content;
import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;

import java.util.Arrays;
import java.util.List;

import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.InjectMocks;
import org.mockito.Mock;
import org.mockito.MockitoAnnotations;
import org.springframework.http.MediaType;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import org.springframework.test.context.web.WebAppConfiguration;
import org.springframework.test.web.servlet.MockMvc;
import org.springframework.test.web.servlet.setup.MockMvcBuilders;

import com.memorynotfound.config.WebConfig;
import com.memorynotfound.controller.UserController;
import com.memorynotfound.filter.CORSFilter;
import com.memorynotfound.model.User;
import com.memorynotfound.service.UserService;

@WebAppConfiguration
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = {WebConfig.class})
public class UserControllerUnitTest {

    private MockMvc mockMvc;

    @Mock
    private UserService userService;

    @InjectMocks
    private UserController userController;

    @Before
    public void init(){
        MockitoAnnotations.initMocks(this);
        mockMvc = MockMvcBuilders.standaloneSetup(userController).addFilters(new CORSFilter()).build();
    }

    @Test
    public void test_get_all_success() throws Exception{
        List<User> users = Arrays.asList(
                new User(1, "Daenerys Targaryen"),
                new User(2, "John Snow"));

        when(userService.getAll()).thenReturn(users);

        mockMvc.perform(get("/users"))
        .andExpect(status().isOk())
        .andExpect(content().contentType(MediaType.APPLICATION_JSON_UTF8_VALUE))
        .andExpect(jsonPath("$", hasSize(2)))
        .andExpect(jsonPath("$[0].id", is(1)))
        .andExpect(jsonPath("$[0].username", is("Daenerys Targaryen")))
        .andExpect(jsonPath("$[1].id", is(2)))
        .andExpect(jsonPath("$[1].username", is("John Snow")));

        verify(userService, times(1)).getAll();
        verifyNoMoreInteractions(userService);
    }
}

我怀疑，与import语句有关的某些东西不起作用。

@RestController
@RequestMapping("/users")
public class UserController {

    private final Logger LOG = LoggerFactory.getLogger(UserController.class);

    @Autowired
    private UserService userService;

    // =========================================== Get All Users ==========================================

    @RequestMapping(method = RequestMethod.GET)
    public ResponseEntity<List<User>> getAll() {
        LOG.info("getting all users");
        List<User> users = userService.getAll();

        if (users == null || users.isEmpty()){
            LOG.info("no users found");
            return new ResponseEntity<List<User>>(HttpStatus.NO_CONTENT);
        }

        return new ResponseEntity<List<User>>(users, HttpStatus.OK);
    }
}

以下是错误，供参考：

java.lang.Error: Unresolved compilation problems: 
    The method andExpect(ResultMatcher) in the type ResultActions is not applicable for the arguments (RequestMatcher)
    The method hasSize(int) is undefined for the type UserControllerUnitTest
    The method is(int) is undefined for the type UserControllerUnitTest
    The method is(String) is undefined for the type UserControllerUnitTest
    The method is(int) is undefined for the type UserControllerUnitTest
    The method is(String) is undefined for the type UserControllerUnitTest
    The method times(int) is undefined for the type UserControllerUnitTest

    at com.memorynotfound.test.UserControllerUnitTest.test_get_all_success(UserControllerUnitTest.java:61)
    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:50)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
    at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)