How to mock persisting and Entity with Mockito and jUnit

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I'm trying to find a way to test my entity using Mockito;

This is the simple test method:

@Mock
private EntityManager em;

@Test
public void persistArticleWithValidArticleSetsArticleId() {
    Article article = new Article();
    em.persist(article);
    assertThat(article.getId(), is(not(0L)));
}

How do I best mock the behaviour that the EntityManager changes the Id from 0L to i.e. 1L? Possibly with the least obstructions in readability.

asked 1 min ago

Patrick

1

How to mock persisting and Entity with Mockito and jUnit