@MockBean and @Autowired of the same service in one test class

Question

Is it possible to somehow have in the same test class @MockBean and @Autowired of the same service?

In other words, I would like to have @MockBean service only for one test, while for others tests of the same class I need it as @Autowired.

Answer 1

This relies on the difference between @MockBean and @Autowired.

@Autowired

only does a lookup in the SpringContext for a bean of that type. This means that you will need to create that bean if you need to 'autowire' it

@MockBean

does exactly what you expect from the name, it creates a 'mock' of the service, and injects it as a bean.

so this

class MyTest {
   @MockBean
   MyService myService;
}

is equivalent to this

@Import(MyTest.Config.class)
class MyTest {

   @Autowired
   MyService myService;

   @TestConfiguration
   static class Config {

      @Bean
      MyService myService() {
         return Mockito.mock(MyService.class);
      }
   }
}

---

So, if you need to have a different bean of the MyService type in other tests, you need to create the bean in a @TestConfiguration annotated class

@Import(MyTest.Config.class)
class MyTest {

   @Autowired
   MyService myService;

   @TestConfiguration
   static class Config {

      @Bean
      MyService myService() {
         return new MyServiceImpl();
      }
   }
}

Or, in a class annotated with @Configuration

@Import(MyConfig.class)
class MyTest {
   @Autowired
   MyService myService;
}

@Configuration
public class MyConfig {
   @Bean
   MyService myService() {
      return new MyServiceImpl();
   }
}

Answer 2

The best solution is to change @MockBean to @SpyBean. And in the method you will be able to do like this:

kotlin

    @SpyBean
    lateinit var serviceMock: Service

    @Test
    fun smallTest()
        `when`(serviceMock.doSomething())
            .thenReturn(false)

        // your test logic
    }