Question

我试图使用Junit测试方法，但测试失败，尽管“预期”与“是......”相同。我想知道这是什么问题？ lowerRate方法只是一种方法，它将“HotelRoom”作为输入，并以10％的折扣输出价格。谢谢这是我的测试代码：

@Test
public void testLowerRate() {
    System.out.println("lowerRate");
    HotelRoom room = new HotelRoom(4, 300, "N");
    HotelRoom instance = new HotelRoom(0, 0, "N");
    HotelRoom expResult = new HotelRoom(4, 270, "N");
    HotelRoom result = instance.lowerRate(room);
    assertEquals(expResult, result);

}
@Test
@SuppressWarnings("empty-statement")
public void testLowerRate2() {
    System.out.println("lowerRate");
    HotelRoom room = new HotelRoom(4, 100, "N");
    HotelRoom instance = new HotelRoom(0, 0, "N");
    HotelRoom expResult = new HotelRoom(4, 90, "N");
    HotelRoom result = instance.lowerRate(room);
    assertEquals(expResult, result);

}
@Test
public void testLowerRate3() {
    System.out.println("lowerRate");
    HotelRoom room = new HotelRoom(4, 1000, "N");
    HotelRoom instance = new HotelRoom(0, 0, "N");
    HotelRoom expResult = new HotelRoom(4, 900, "N");
    HotelRoom result = instance.lowerRate(room);
    assertEquals(expResult, result);

}
}

编辑------

以下是该计划的代码：

class HotelRoom {

private int numofBeds;
private double rateperNight;
private String YorNoceanView;

HotelRoom(int input1, double input2, String input3) {
    numofBeds = input1;
    rateperNight = input2;
    YorNoceanView = input3;

}

public int getnumofBeds() {
    return numofBeds;
}

public void setnumofBeds(int numofBeds) {
    this.numofBeds = numofBeds;
}

public double getrateperNight() {
    return rateperNight;
}

public void setrateperNight(double rate) {
    this.rateperNight = rateperNight;
}

public String getYorNoceanView() {
    return YorNoceanView;
}

public void setYorNoceanView(String YorNoceanView) {
    this.YorNoceanView = YorNoceanView;
}

@Override
public String toString() {
    return "Hotel Room{" + "Title= " + numofBeds + ", Rate per night= $" + rateperNight + ", Ocean View (Y or N)=" + YorNoceanView + "}";

}

String roomUnder(HotelRoom room, double price) {
    if (room.getrateperNight() > price) {
        return "The room costs more than the given price";
    }
    if (room.getrateperNight() < price) {
        return "The room costs less than the given price";
    }
    else 
        return "The room costs as much as the given price.";
}
HotelRoom lowerRate(HotelRoom room) {
    room.rateperNight = 0.9 * room.rateperNight;
    return room;
}
}

public class Chpt2930HotelRoom {

/**
 * @param args the command line arguments
 */
public static void main(String[] args) {

    int num1 = 1;
    int num2 = 2;
    String input = "input";

    Scanner scan = new Scanner(System.in);
    Scanner user = new Scanner(System.in);
    System.out.print("Enter number of Beds: ");
    int nextLineBeds = scan.nextInt();
    HotelRoom HotelR = new HotelRoom(num1, num2, input);
    HotelR.setnumofBeds(nextLineBeds);
    System.out.println();


    System.out.print("Enter rate per night in Dollars: $");
    double nextLineRate = scan.nextDouble();
    HotelR.setrateperNight(nextLineRate);
    System.out.println();


    System.out.print("Enter whether the room has an ocean view (Y or N): ");
    String nextLineOcean = user.nextLine();
    HotelR.setYorNoceanView(nextLineOcean);
    System.out.println();

    System.out.println(HotelR.toString());
}
}

Answer 1

您应该覆盖equals课程中的方法HotelRoom。

@Override
public boolean equals(Object other){
    //return true if memberwise equal
}

Answer 2

你遗漏了一些非常基本的东西。您的lowerRate方法返回HotelRoom类的对象，并且您使用assertEquals方法将该对象均衡为完全不同的对象实例。这必然是均衡对象引用（因为您没有覆盖equals()方法）。由于是两个不同的对象，它们的引用也不同，你的断言也失败了。

由于您希望根据rate属性对对象进行均衡，因此您需要覆盖类HotelRoom的equals方法，如下所示：

@Override
public boolean equals(Object obj){

    if(obj instanceof HotelRoom) {
       if( Math.abs(this.rateperNight - ((HotelRoom) obj).rateperNight) < .000001) {
            return true;
       }
    }
    return false;
}

只有这样，您的酒店客房才会像您期望的那样进行比较。

请参阅：

Junit测试 - 没有我能看到的错误？

2 个答案: