java - Java 中比较器的 JUnit 测试

Question

如何使用 JUnit 测试来测试以下类。我是单元测试的新手，我只需要插入即可开始

public class ComponentComparator implements Comparator< Component >
{

@Override
public int compare ( final Component c1, final Component c2 )
{
    if ( c1.getBandwidthWithHeader() > c2.getBandwidthWithHeader() )
    {
        return -1;
    }
    else if ( c1.getBandwidthWithHeader() < c2.getBandwidthWithHeader() )
    {
        return 1;
    }
    return 0;
}
}

组件类的一部分是，这个类没有构造函数

public class Component
{
   private float bandwidthwithHeader;

   public void setBandwidthWithHeader ( float bandwidthwithHeader )
   {
       this.bandwidthwithHeader = bandwidthwithHeader;
   }
   public float getBandwidthWithHeader ()
   {
       return this.bandwidthwithHeader;
   }     
}

Answer 1

您应该阅读一些有关 JUnit 的教程。Morfic 的评论指出了一个很好的教程。

首先为您提供帮助 - 比较器可能返回三个值 -> 为每个值编写一个案例。

import org.junit.Assert;
import org.junit.Test;

public class ComponentComparatorTest {

    @Test
    public void testCompare() throws Exception {
        ComponentComparator comparator = new ComponentComparator();
        Assert.assertEquals(comparator.compare(new Component(1), new Component(1)), 0);
        Assert.assertEquals(comparator.compare(new Component(2), new Component(1)), -1);
        Assert.assertEquals(comparator.compare(new Component(1), new Component(2)), 1);
    }
}

我正在使用虚拟类

public class Component {
    int bandwidth;

    public Component(int bandwidth) {
        this.bandwidth = bandwidth;
    }

    public int getBandwidthWithHeader(){
        return bandwidth;
    }
}