编写代码

进入官网 Spring Initializr 初始化项目
编写控制HelloController

package com.pyr.spring.cloud.weather.controller;

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

@RestController
public class helloController {

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

编写测试用例

package com.pyr.spring.cloud.weather.controller;

import org.junit.jupiter.api.Test;
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.web.servlet.MockMvc;
import org.springframework.test.web.servlet.request.MockMvcRequestBuilders;

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;

@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
@AutoConfigureMockMvc
class helloControllerTest {

  @Autowired
  private MockMvc mockMvc;

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