SpringBoot restful api的单元测试

@RunWith(SpringRunner.class)
@SpringBootTest
public class UserControllerTest {
}

  // 注入Spring 工厂
    @Autowired
    private WebApplicationContext wac;
  //伪造mvc环境
    private MockMvc mockMvc;
   @Before
    public void setup(){
        mockMvc = MockMvcBuilders.webAppContextSetup(wac).build();
    }

import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.post;
import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.put;
import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.delete;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.jsonPath;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;

@Test
    public void whenXXXXSuccess() throws Exception {
        //模拟发送请求
        String result =
        mockMvc.perform(get("/user") //发往/user的get请求,可以换成post，put，delete方法执行相应请求
                        .param("username","xxx")  //get请求时填写参数的位置
                        .contentType(MediaType.APPLICATION_JSON_UTF8)  //utf编码
                        .content(content)) //post和put请求填写参数的位置
                .andExpect(status().isOk())
                .andExpect(jsonPath("$.length()").value(3))  //期望的json返回结果
                .andReturn().getResponse().getContentAsString();  //对返回字符串的json内容进行判断
        log.info(result);
    }