@SpringBootTest注解进行单元测试

@RunWith(SpringRunner.class)
@SpringBootTest(classes = StartUpApplication.class, webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
public class HelloControllerTest {

    /**
     * @LocalServerPort 提供了 @Value("${local.server.port}") 的代替
     */
    @LocalServerPort
    private int port;

    private URL base;

    @Autowired
    private TestRestTemplate restTemplate;

    @Before
    public void setUp() throws Exception {
        String url = String.format("http://localhost:%d/", port);
        System.out.println(String.format("port is : [%d]", port));
        this.base = new URL(url);
    }

    /**
     * 向"/test"地址发送请求，并打印返回结果
     * @throws Exception
     */
    @Test
    public void test1() throws Exception {

        ResponseEntity<String> response = this.restTemplate.getForEntity(
                this.base.toString() + "/test", String.class, "");
        System.out.println(String.format("测试结果为：%s", response.getBody()));
}