public class MyServiceImplTest {
    @Mock
    private MyRepository myRepository;

    @Autowired
    @InjectMocks
    private MyServiceImpl myService;

    @Before
    public void initMocks() {
        MockitoAnnotations.initMocks(this);
    }

    @Test(expected = ServiceException.class)
    public void testSomething() throws ServiceException {
        // My Test Code
    }
}