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

 // 注入Spring 工廠
  @Autowired
  private WebApplicationContext wac;
 //偽造mvc環(huán)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 {
    //模擬發(fā)送請求
    String result =
    mockMvc.perform(get("/user") //發(fā)往/user的get請求,可以換成post，put，delete方法執(zhí)行相應(yīng)請求
            .param("username","xxx") //get請求時填寫參數(shù)的位置
            .contentType(MediaType.APPLICATION_JSON_UTF8) //utf編碼
            .content(content)) //post和put請求填寫參數(shù)的位置
        .andExpect(status().isOk())
        .andExpect(jsonPath("$.length()").value(3)) //期望的json返回結(jié)果
        .andReturn().getResponse().getContentAsString(); //對返回字符串的json內(nèi)容進行判斷
    log.info(result);
  }