使用spring boot restcontroller进行Junit测试

@RestController
public class UserController {
    
    @Autowired
    private UserService userService;
    
    @RequestMapping(value = "/users/{id}", method = RequestMethod.GET)
    public User getUser(@PathVariable("id") int id) {
        return userService.getUserById(id);
    }
}

@Service
public class UserService {
    
    public User getUserById(int id) {
        // 从数据库或其他数据源获取用户信息
        // ...
    }
}

@RunWith(SpringRunner.class)
@SpringBootTest
@AutoConfigureMockMvc
public class UserControllerTest {
    
    @Autowired
    private MockMvc mockMvc;
    
    @MockBean
    private UserService userService;
    
    @Test
    public void testGetUser() throws Exception {
        User user = new User();
        user.setId(1);
        user.setName("John");
        
        Mockito.when(userService.getUserById(1)).thenReturn(user);
        
        mockMvc.perform(MockMvcRequestBuilders.get("/users/1"))
            .andExpect(MockMvcResultMatchers.status().isOk())
            .andExpect(MockMvcResultMatchers.jsonPath("$.id", Matchers.is(1)))
            .andExpect(MockMvcResultMatchers.jsonPath("$.name", Matchers.is("John")));
    }
}