@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = MyRealApplicationConfig.class)
public final class MyApplicationSpringTest {
    @Inject MyApplication myApplication;
    @Mocked SomeService mockService;

    @BeforeClass // runs before Spring configuration
    public static void setUpMocksForSpringConfiguration() {
        new MockUp<SomeService>() {
            @Mock String getName() { return "one"; }
        };
    }

    @Test
    public void doSomethingUsingMockedService() {
        new Expectations() {{ mockService.doSomething(); result = "two"; }};

        String result = myApplication.doSomething();

        assertEquals("one two", result);
    }
}