source: class MyService {
  
      public String message(){
          return "this is module for helloworld.service method message";
      }
  
      @Autowired
      private MyService myService;
  
  }
  
  class MyServiceTest {
  
      @Autowired
      private MyService myService;
  
      @Test
      public void contextLoads(){
  
target:         assertThat(myService.message()).isNotNull();
      }
  
  }