项目不带Test包就得自己搞一个

pom.xml添加依赖

     org.springframework.boot     spring-boot-starter-test     test 

创建目录（src下跟main同级且要跟启动类同路径结构）

编写代码

@RunWith(SpringRunner.class) //如果此文件所在目录跟启动类所在目录不一致就要加上classes = FirmwareApplication.class //webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT是解决找不到spring上下文对象 @SpringBootTest(classes = FirmwareApplication.class,webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT) public class Mytest {      @Autowired     private FirmwareServiceImpl firmwareServiceImpl;      @Test     public void hello(){         List> integerStringHashMap = firmwareServiceImpl.firmwareTypeRanking();         System.out.println(integerStringHashMap);     }  } 

如果不加webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT就会出现下图报错java.lang.IllegalStateException: Failed to load ApplicationContext

不加@RunWith(SpringRunner.class)就会出现