SpringBootTest

测试用到jsonPath，可以到github找到相关文档

package com.kelvin.web.controller;


import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
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.setup.MockMvcBuilders;
import org.springframework.web.context.WebApplicationContext;

import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.*;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.*;

@RunWith(SpringRunner.class)
@SpringBootTest
public class UserControllerTest {
    @Autowired
    WebApplicationContext wac;

    MockMvc mockMvc;

    @Before
    public void setup () {
        mockMvc = MockMvcBuilders.webAppContextSetup(wac).build();
    }

    @Test
    public void whenQuerySuccess() throws Exception {
        mockMvc.perform(get("/user")
                .param("username","kelvin")
                .contentType(MediaType.APPLICATION_JSON_UTF8))
                .andExpect(status().isOk())
                .andExpect(jsonPath("$.length()").value(3));
    }

}