Testing

Mockito Spy, Stubbing a Spy

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https://www.baeldung.com/mockito-spy

Wrap an instance of a real business object in a mockito spy, so that you can verify certain behavior was called

SubscriptionEntity entity = Mockito.spy(subscriptionEntity());

No, on the spy you can assert that a certain method was called

verify(entity, times(1)).setFcaSalesForceToken(FCA_SFO_TOKEN);
        verify(repository, times(1)).saveSubscription(entity);

You can go even further and you can override existing behavior on a real business object, to customize it according to your needs during the testing: see here: https://www.baeldung.com/mockito-spy#stubbing-a-spy 

@Test
public void whenStubASpy_thenStubbed() {
    List<String> list = new ArrayList<String>();
    List<String> spyList = Mockito.spy(list);

    assertEquals(0, spyList.size());

    Mockito.doReturn(100).when(spyList).size();
    assertEquals(100, spyList.size());
}

In Spring you can Spy a Bean/Service like

    @Autowired
    @SpyBean
    PriceService priceService;

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