如何使用 hamcrest 断言对象相等答案

【问题标题】：how to assert objects are equal using hamcrest如何使用 hamcrest 断言对象相等
【发布时间】：2015-05-18 22:30:57
【问题描述】：

我想编写测试来检查两个对象是否相同。当断言失败时，我想知道哪些字段是相同的，哪些不是。我可以对每个字段进行断言，但想知道是否有办法对对象进行比较。

卡车类：

import java.util.List;

public class Truck {

    private String model;
    private String make;
    private int year;
    private List<TruckPartsObject> parts;

    public Truck(String model, String make, int year) {
        super();
        this.model = model;
        this.make = make;
        this.year = year;
    }

    public String getModel() {
        return model;
    }

    public void setModel(String model) {
        this.model = model;
    }

    public String getMake() {
        return make;
    }

    public void setMake(String make) {
        this.make = make;
    }

    public int getYear() {
        return year;
    }

    public void setYear(int year) {
        this.year = year;
    }

    public List<TruckPartsObject> getParts() {
        return parts;
    }

    public void setParts(List<TruckPartsObject> parts) {
        this.parts = parts;
    }

    @Override
    public String toString() {
        return "Truck{" + "model='" + model + '\'' + ", make='" + make + '\''
                + ", year=" + year + ", parts=" + parts + '}';
    }

}

TruckPartsObject 类：

import java.util.HashMap;

public class TruckPartsObject {

    private String name;
    private String price;
    private HashMap<String, String> partsHashMap;

    public String getName() {
        return name;
    }

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

    public String getPrice() {
        return price;
    }

    public void setPrice(String price) {
        this.price = price;
    }

    public HashMap<String, String> getPartsHashMap() {
        return partsHashMap;
    }

    public void setPartsHashMap(HashMap<String, String> partsHashMap) {
        this.partsHashMap = partsHashMap;
    }

    @Override
    public String toString() {
        return "TruckPartsObject{" + "name='" + name + '\'' + ", price='"
                + price + '\'' + ", partsHashMap=" + partsHashMap + '}';
    }
}

测试：

@Test
public void truckTest () {

    Truck pickupTruck1 = new Truck("Big 10", "Chevy", 1976);
    Truck pickupTruck2 = new Truck("Big 10", "Chevy", 1976);        

    List<TruckPartsObject> parts1 = new ArrayList<TruckPartsObject>();
    TruckPartsObject truckPartsObject1 = new TruckPartsObject();
    truckPartsObject1.setName("part1");
    parts1.add(truckPartsObject1);
    pickupTruck1.setParts(parts1);

    List<TruckPartsObject> parts2 = new ArrayList<TruckPartsObject>();
    TruckPartsObject truckPartsObject2 = new TruckPartsObject();
    truckPartsObject2.setName("part1");
    parts2.add(truckPartsObject2);
    pickupTruck2.setParts(parts2);

    pickupTruck2.setParts(parts2);
    System.out.println(pickupTruck1);
    System.out.println(pickupTruck2);

    //how to assert pickupTruck1 and pickupTruck2 have the same 
}

如何断言pickupTruck1和pickupTruck2相同？

【问题讨论】：

Truck 对象是不是故意没有equals 方法，还是只是这里没有显示？
它没有equals方法。如果这是正确的解决方案，我可以添加 equals 方法。如果我这样做，那么我还必须覆盖 hasCode() 并添加逻辑以检查值是否不为空并手动检查每个值。此外，当测试失败时，显示实际与预期的错误消息将不那么清楚。所以想知道有没有更好的解决方案。
可以使用 Apache commons-lang3 库的 EqualsBuilder、HashCodeBuilder 和 ToStringBuilder。这将在失败时提供有用的错误消息。

标签： testing assert assertions hamcrest rest-assured

【解决方案1】：

感谢同事提供以下解决方案：

使用 Shazamcrest (https://github.com/shazam/shazamcrest)

assertThat(pickupTruck1, sameBeanAs(pickupTruck2));

【讨论】：