应该算springboot的问题吧，刚接触请教大神

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * hello controller
 * @author ZHOUQIAN
 *
 */
@RestController
public class HelloController {

    @RequestMapping("/hello")
    public String hello() {
        return "Hello World!";
    }
}

import static org.hamcrest.Matchers.equalTo;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.content;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.http.MediaType;
import org.springframework.test.context.junit4.SpringRunner;
import org.springframework.test.web.servlet.MockMvc;
import org.springframework.test.web.servlet.request.MockMvcRequestBuilders;

/**
 * 
 * @author ZHOUQIAN
 *
 */
@RunWith(SpringRunner.class)
@SpringBootTest(classes = HelloController.class)
@AutoConfigureMockMvc
public class HelloControllerTests {

    @Autowired
    private MockMvc mockMvc;

    @Test
    public void testHello() throws Exception {
        mockMvc.perform(MockMvcRequestBuilders.get("/hello").accept(MediaType.APPLICATION_JSON))
                .andExpect(status().isOk()).andExpect(content().string(equalTo("Hello World!")));
    }
}

没啥问题啊。我都测试通过了