Using Mockito Spy for mocking and using functions as they are. Sometimes you want to use mocks just for some functions. So that’s where when(..).thenCallRealMethod() comes in.

So let’s get into the code:

@SpringBootTest
class ServiceMockTest{
    @Autowired
    private MySearchService myService;
    @SpyBean
    private MyRepository myRepository;

    @Test
    void myMockTest() {
        when(myService.getMs()).thenReturn("Hello from the mock!!");
        // when
        String msResult = myService.getMs();
        // then
        assertEquals("Hello from the mock!!", msResult);
    }

    @Test
    void myNormalTest() {
        when(myService.getMs()).thenCallRealMethod();
        // when
        String msResult = myService.getMs();
        // then
        assertEquals("Hello from the Real!!", msResult);
    }
}

And that is how you use mocks and real methods in one @Autowired test class for Spring service and repository testing.