1、导入pom坐标

         <dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.12</version><scope>test</scope></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-test</artifactId><version>5.2.10.RELEASE</version></dependency>

2、编写测试用例

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = SpringConfig.class)
public class AccountServiceTest {@Autowiredprivate AccountService accountService;@Testpublic void TestFindById(){System.out.println( accountService.findById(1));}
}

• @RunWith   指定测试用例类型
• @ContextConfiguration 指定测试SpringConfig配置类 
• @Autowired  自动装配
• @Test  表明这个是测试用例