springboot利用mock进行junit单元测试，测试controller

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-test</artifactId>
    <scope>test</scope>
</dependency>

package com.shangcg.controller;

import javax.servlet.http.HttpServletRequest;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

/**
 * @version v1.0
 * @Description: junit和mock单元测试示例
 * @Author: shangcg
 * @Date: 2019/12/24
 */

@RestController
public class UnitDemoController {

    @RequestMapping(value = "/hello.json", method = RequestMethod.GET)
    public String getListTag(HttpServletRequest request,
                             @RequestParam(value = "name", required = false, defaultValue = "0") String name) {
        try {
            return "hello :" + name;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return "hello everyone !";
    }

    @RequestMapping(value = "/save.json", method = RequestMethod.POST)
    public String saveTag(HttpServletRequest request,
                          @RequestParam(value = "name", required = true) String name,
                          @RequestParam(value = "level", required = true) Integer level) {
        try {
            return "recive your param " + "name: " + name + " level: " + level;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }
}

package com.shangcg.controller;

import static org.junit.Assert.*;
import org.junit.Assert;
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.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.MvcResult;
import org.springframework.test.web.servlet.request.MockMvcRequestBuilders;
import org.springframework.test.web.servlet.result.MockMvcResultHandlers;
import org.springframework.test.web.servlet.result.MockMvcResultMatchers;
import org.springframework.test.web.servlet.setup.MockMvcBuilders;
import org.springframework.web.context.WebApplicationContext;

/**
 * @version v1.0
 * @Description: TODO
 * @Author: shangcg
 * @Date: 2019/12/24
 */

@RunWith(SpringRunner.class)
@SpringBootTest
@AutoConfigureMockMvc
public class UnitDemoControllerTest {


    @Autowired
    private WebApplicationContext webApplicationContext;
    private MockMvc mockMvc;

    @Before
    public void setUp() {
        mockMvc = MockMvcBuilders.webAppContextSetup(webApplicationContext).build();//建议使用这种
    }


    @Test  //对get方法的测试
    public void testGetListTag() throws Exception {

        MvcResult mvcResult = mockMvc.perform(
                MockMvcRequestBuilders.get("/hello.json")
                        .contentType(MediaType.APPLICATION_JSON).characterEncoding("utf-8")
                        .param("name", "shangcg")
        ).andExpect(MockMvcResultMatchers.status().isOk())
                .andDo(MockMvcResultHandlers.print())
                .andReturn();

        String content = mvcResult.getResponse().getContentAsString();
        Assert.assertEquals("hello :shangcg", content);
    }

    @Test //对post测试
    public void saveTag() throws Exception {

        MvcResult mvcResult = mockMvc.perform(
                MockMvcRequestBuilders.post("/save.json")
                        .contentType(MediaType.APPLICATION_JSON)
                        .param("name", "shangcg")
                        .param("level", "1")
        ).andExpect(MockMvcResultMatchers.status().isOk())
                .andDo(MockMvcResultHandlers.print())
                .andReturn();
        String content = mvcResult.getResponse().getContentAsString();
        Assert.assertEquals("recive your param name: shangcg level: 1", content);
    }
}