解决Spring boot 整合Junit遇到的坑

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

   @RunWith(value = SpringJUnit4ClassRunner.class)
    @SpringBootTest(classes={Demo.class})  // **注意：启动类为自己编写的（这是个坑）**
    public class serviceTest {
        @Autowired
        private serviceImpl serviceimpl;
        @Test
        public void testAdd() {
            this.serviceimpl.add();
        }
    }

@SpringBootApplication
public class Demo {
public static void main(String[] args) {
    SpringApplication springApplication = new SpringApplication(Demo.class);
     // 这个是关闭springboot启动时候的图标可以不设置
    springApplication.setBannerMode(Banner.Mode.OFF); 
    springApplication.run(args);
}
}

@SpringBootTest(classes={App.class})

@RunWith(SpringRunner.class)
@SpringBootTest(classes = EhrApplication.class)
public class EhrApplicationTest {
	@Autowired
	HealthExamReSerivice healthExamReSerivice;	
	@Test
	public void contextLoads() {		
	}
}

@ComponentScan(basePackages = {"com.xjgx"})