测试类中加两个注解就行

@SpringBootTest(classes = Application.class)//添加SpringBoot 的启动类，万无一失
@RunWith(SpringJUnit4ClassRunner.class)
public class SpringBootJunitTest {@Testpublic void test(){System.out.println("ddddddddddddddddddd");}}

@SpringBootTest
@ContextConfiguration(classes = Application.class)

上面两个背景黄色的注解，

@SpringBootTest(classes = Application.class)//添加SpringBoot 的启动类，万无一失

一行等同于下面两行，功能一样

@SpringBootTest

@ContextConfiguration(classes = Application.class)