如何在JUnit测试中从抽象类创建对象

时间:2019-01-02 13:26:45

标签: java object junit abstract-class

我有一个abstract class Printers,我只想测试其equals方法,但是当我在Printers中创建两个PrintersTest时,我无法对其进行实例化。

这是PrintersTest

import static org.junit.jupiter.api.Assertions.*;

import org.junit.jupiter.api.Test;

class PrintersTest {

    @Test
    void testEqualsObject() {
        Printers a = new Printers("BW_LASER HP", "Laserjet 1230", "25", "180 euros");
        Printers b = new Printers("BW_LASER HP", "Laserjet 1230", "25", "180 euros");
        assertEquals(a,b);
    }       
}

这是Printers类:

import java.util.Objects;

public abstract class Printers {
    protected String brand;
    protected String model;
    protected String pages;
    protected String price;

    public Printers(String brand, String model, String pages, String price) { 
        super();
        this.brand = brand;
        this.model = model;
        this.pages = pages;
        this.price = price;
    }

    /*
     * (non-Javadoc)
     * 
     * @see java.lang.Object#equals(java.lang.Object)
     */
    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj == null) {
            return false;
        }
        if (!(obj instanceof Printers)) {
            return false;
        }
        Printers other = (Printers) obj;
        return Objects.equals(brand, other.brand) && Objects.equals(model, other.model)
                && Objects.equals(pages, other.pages) && Objects.equals(price, other.price);
    }
}

非常感谢您的帮助。

1 个答案:

答案 0 :(得分:1)

您需要从打印机扩展另一个类(可能已经拥有),例如某种打印机或其他类型,然后在测试类中,基于该类创建一个新的打印机,如下所示:

@Test
    void testEqualsObject() {
        Printers a = new Bw("BW_LASER HP", "Laserjet 1230", "25", "180 euros");
        Printers b = new Bw("BW_LASER HP", "Laserjet 1230", "25", "180 euros");
        assertEquals(a,b);
    }

这将解决您的问题,因为您无需实例化打印机。