直接上代码

要测试的controller

/**
 * @description:
 * @author: Edison
 * @create: 2021-05-11 22:06
 **/
@RestController
@RequestMapping("user")
public class UserController {

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

    @Autowired
    private UserBusiness userBusiness;



    @PostMapping("/login")
    public BaseResponse<UserDto> login(@RequestBody @Validated UserDto userDto , BindingResult result){

        return  userBusiness.login(userDto);

    }

测试类

1. 路径前要加斜杆否则会报错
   java.lang.IllegalArgumentException: 'url' should start with a path or be a complete HTTP URL: user/login

/**
 * @description:
 * @author: Edison
 * @create: 2021-08-31 23:18
 **/
public class UserControllerTest {

    @Autowired
    private MockMvc mockMvc;

    @InjectMocks
    private UserController userController;

    @Mock
    private UserBusiness userBusiness;

    @Before
    public void setup() {
        //初始化
        MockitoAnnotations.initMocks(this);
        //构建mvc环境
        mockMvc = MockMvcBuilders.standaloneSetup(userController).build();
    }

    @Test
    public  void test() throws Exception{
        String data = "{\n" +
                "\t\"userName\": \"test\",\n" +
                "\t\"password\": \"test\",\n" +
                "\t\"userId\": 1\n" +
                "}";
// 打桩  
      Mockito.when(userBusiness.login(Mockito.any())).thenReturn(new BaseResponse(StatusCode.Success));
      	// url 
        mockMvc.perform(MockMvcRequestBuilders.post("/user/login")
        		// 这里面还可以设置很多东西，比如加Header 等等
       			 // 设置数据格式
                .contentType(MediaType.APPLICATION_JSON_VALUE)
                // 数据
                .content(data)
                
        ).andExpect(status().isOk());
         // 期望的结果，其实可以写得更具体

    }

}

写的比较简单，测试框架里有很多API ，用的时候仔细看就行。