模拟持久性类返回IllegalArgumentException

Question

当我尝试使用mock(Event.class)模拟类Event ，我得到了：

java.lang.IllegalArgumentException: Object: Mock for Event, hashCode: 640142691 is not a known entity type.

这是事件类：

@Entity
@Table(name = "event")
@XmlRootElement
public class Event implements Serializable {
    private static final long serialVersionUID = 1L;

   @Id
   @GeneratedValue(strategy = GenerationType.AUTO)
   @Basic(optional = false)
   @Column(unique = true, name = "id")
   private Integer eventId;

   @Basic(optional = false)
   @NotNull
   @Size(min=1, max=255)
   @Column(name = "title")
   private String eventTitle;

   @Basic(optional = false)
   @JoinColumn(name = "created_by", referencedColumnName = "id")
   @ManyToOne
   private User eventCreatedBy;

   @Basic(optional = false)
   @Column(name = "created")
   @Temporal(TemporalType.TIMESTAMP)
   private Date eventCreated;

   public Event() {
   }

   // getters and setters for all database fields

   @Override
   public int hashCode() {
       int hash = 0;
       hash += (eventId != null ? eventId.hashCode() : 0);
       return hash;
   }

   @Override
   public boolean equals(Object object) { 
       if (!(object instanceof Event)) {
           return false;
       }
       Event other = (Event) object;
       if ((this.eventId == null && other.eventId != null) || (this.eventId != null && !this.eventId.equals(other.eventId))) {
           return false;
       }
       return true;
   }

   @Override
   public String toString() {
       return "Event[ eventId=" + eventId + " ]";
   }

这是测试类：

public class EventTest {

   private static final Integer EVENT_ID = 1;
   private static final String EVENT_TITLE = "title";

   private EntityManager em;
   private EntityTransaction et;
   private EventServiceImpl eventService;

   @Before
   public void setUp() throws Exception {
       em = Persistence.createEntityManagerFactory("test").createEntityManager();
       et = em.getTransaction();
       eventService = new EventServiceImpl();
       eventService.em = em;

       Event event = mock(Event.class);

       et.begin();
       em.persist(event);
   }

   @After
   public void tearDown() throws Exception {
       em.close();
   }

   @Test
   public void getList() {
       List list = eventService.getList();
       Event data = (Event) list.get(0);

       assertEquals(1, list.size());
       assertEquals(EVENT_TITLE, data.getEventTitle());
   }

   @Test
   public void getById() {
       Event data = eventService.get(EVENT_ID);
       assertEquals(EVENT_ID, data.getEventId());
   }
}

有人知道如何处理吗？

Answer 1

您正在尝试保留Event的模拟，而不是其真实实例。 这是行不通的，因为，就像异常情况一样，实体管理器无法将模拟的类型识别为实体。

如果要编写集成测试，则应避免模拟，而应使用真实的类而不是模拟。 嘲笑更常用于使单元测试独立于其他类。

Event event = new Event(); // Entity manager will recognize this as entity
...

et.begin();
em.persist(event);