JUnit Testing的問題:: assertEquals（）

Question

我有以下類，但是我的jUnit assertEquals（）測試無法正常工作。 經過幾天的搜索並且沒有答案，我決定在這里發布。 代碼中的所有內容似乎都正確，但是仍然無法正常工作。

聯系人類別：

@Embeddable
public class Contact {

    @Column
    private String name;

    @Column
    private String address;

    @Column
    private String phone;

    public Contact(){
    }

    public Contact(String name, String address, String phone) {
        super();
        this.name = name;
        this.address = address;
        this.phone = phone;
    }

    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }

    public String getAddress() {
        return address;
    }
    public void setAddress(String address) {
        this.address = address;
    }

    public String getPhone() {
        return phone;
    }
    public void setPhone(String phone) {
        this.phone = phone;
    }

    public String toString() {
        return "Contact [name=" + name + ", address=" + address + ", phone=" + phone + "]";
    }

    @Override
    public boolean equals(Object o){
        if(this == o){
            return true;
        }
        if(o == null){
            return false;
        }
        if(this.getClass() != o.getClass()){
            return false;
        }

        Contact contact = (Contact)o;

        if(name != contact.getName()){return false;}
        if(address != contact.getAddress()){return false;}
        if(phone != contact.getPhone()){return false;} 

        return true;
    }

    @Override
    public int hashCode() {
        int result = name != null ? name.hashCode() : 0;
        result = 31 * result + (address != null ? address.hashCode() : 0);
        result = 31 * result + (phone != null ? phone.hashCode() : 0);

        return result;          
    }       
}

訂單類別：

@Entity
public class Orders {

    @Id
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    private Long id;

    @Embedded
    @AttributeOverrides({
        @AttributeOverride(name="name", column=@Column(name="weekday_recipient")),
        @AttributeOverride(name="address", column=@Column(name="weekday_address")),
        @AttributeOverride(name="phone", column=@Column(name="weekday_phone")),
    })
    private Contact weekdayContact;


    @Embedded
    @AttributeOverrides({
        @AttributeOverride(name="name", column=@Column(name="holiday_recipient")),
        @AttributeOverride(name="address", column=@Column(name="holiday_address")),
        @AttributeOverride(name="phone", column=@Column(name="holiday_phone"))
    })
    private Contact holidayContact;

    public Orders() {
        super();
    }

    public Long getId() {
        return id;
    }

    public Contact getWeekdayContact() {
        return weekdayContact;
    }
    public void setWeekdayContact(Contact weekdayContact) {
        this.weekdayContact = weekdayContact;
    }

    public Contact getHolidayContact() {
        return holidayContact;
    }
    public void setHolidayContact(Contact holidayContact) {
        this.holidayContact = holidayContact; 
    }

    public String toString() {
        return "orders [WEEKDAY_CONTACT=" + this.getWeekdayContact().toString() +  
         ", HOLIDAY_CONTACT=" + this.getHolidayContact().toString() + "]";
    }

    @Override
    public boolean equals(Object o){
        // self check
        if(this == o){
            return true;
        }
        // null check
        if(o == null){
            return false;
        }
        //type check and cast
        if(getClass() != o.getClass()){
            return false;
        }
        Orders orders = (Orders)o;
        // field comparison

        return Objects.equals(weekdayContact, orders.weekdayContact)
                &&
               Objects.equals(holidayContact, orders.holidayContact);


    }

}

測試班

public class Chapter3Test {
    Contact weekdayContact = new Contact("Vienna", "Milkstreet 20", "+336598741");
    Contact holidayContact = new Contact("Cocos Island", "Gulay avenue 85", "+5589632147");
    Orders orders = new Orders();


    EntityManager em = EntitySessionManager.getEntityManager();


    @Before
    public void setUp(){
        orders.setWeekdayContact(weekdayContact);
        orders.setHolidayContact(holidayContact);
        em.getTransaction().begin();
    }

    @Test
    public void createOrders() {

        em.persist(orders);

        em.getTransaction().commit();
        em.close();
    }

    @Test
    public void retrieveOrders(){
        em = EntitySessionManager.getEntityManager();
        em.getTransaction().begin();

        Orders myOrders = em.find(Orders.class, 2L);

        assertEquals("They are not Equal", myOrders.getWeekdayContact(), orders.getWeekdayContact());
        assertEquals("They are not Equal", myOrders.getHolidayContact(), orders.getHolidayContact());

        em.getTransaction().commit();
        em.close();
    }

    @After
    public void closeResources(){
        //em.close();
    }

}

運行測試時，我得到以下結果：

java.lang.AssertionError: They are not Equal expected: chapter3.Contact<Contact [name=Vienna, address=Milkstreet 20, phone=+336598741]> but was: chapter3.Contact<Contact [name=Vienna, address=Milkstreet 20, phone=+336598741]>

您可以看到預期的結果和返回的結果是相同的。

Answer 1

這里：

private String name;

但是然后在您的equals方法中：

if(name != contact.getName()){return false;}

您正在比較==和resp的字符串。 ！=這里。

錯誤（有關詳細信息，請參見此處 ）。 請改用name.equals(contact.getName()) ！

並不是asssertEquals()錯誤。 這種方法只是調用您的實現equals() 。 因此，當結果出乎意料時 ，則必須破壞您的實現！

提示： 比較任何東西（尤其是字符串）時，請不要相信它們看起來相同 。 使對象相等的 唯一一件事是equals()方法的結果。 別的不計！