使用Hamcrest增强JUnit的测试能力

 package com.jadyer.service;  
  
import java.util.HashMap;  
import java.util.Map;  
  
import org.hamcrest.Matchers;  
import org.junit.Assert;  
import org.junit.Test;  
  
/** 
 * 使用Hamcrest增强JUnit的测试能力 
 * @see Hamcrest框架提供了一些相对通俗并高效的方法来进行一些junit比较困难的测试 
 * @see 比如比较数值大小、测试对象类型、测试数组元素等等 
 * @see Hamcrest下载地址为https://code.google.com/p/hamcrest/downloads/list 
 * @see JUnit下载地址为https://github.com/junit-team/junit/wiki/Download-and-Install 
 * @see ------------------------------------------------------------------------------------------------ 
 * @see 1)所需jar(有两个) 
 * @see   junit-4.10.jar 
 * @see   hamcrest-all-1.3.jar 
 * @see ------------------------------------------------------------------------------------------------ 
 * @see 2)注意事项 
 * @see   测试时可能报告类似这个的异常java.lang.NoSuchMethodError: org.hamcrest.core.AllOf.allOf 
 * @see   这时只需将hamcrest.jar移到junit.jar的前面就可以了,否则组合条件如allOf、anyOff等都会抛此异常 
 * @see ------------------------------------------------------------------------------------------------ 
 * @create Jul 6, 2013 5:11:27 PM 
 * @author 玄玉 
 */  
public class TestByHamcrest {  
    /** 
     * 如果用的是JUnit-4.10,那么这里可以使用org.junit.Assert类,它提供了assertThat的功能 
     * 如果用的是JUnit低版本,如MyEclipse6.5自带的JUnit-4.3.1则未提供Assert.assertThat功能 
     * 这时可以使用hamcrest-all-1.3.jar自带的org.hamcrest.MatcherAssert.assertThat()方法 
     */  
    @Test  
    public void testHamcrest(){  
        //50是否大于20   
        Assert.assertThat(50, Matchers.greaterThan(20));  
        //50是否大于或等于50   
        Assert.assertThat(50, Matchers.greaterThanOrEqualTo(50));  
          
        //50是否即大于20又小于60(allOf方法类似于





Java中的&&)   
        Assert.assertThat(50, Matchers.allOf(Matchers.greaterThan(20), Matchers.lessThan(60)));  
        //50是否大于20或小于40(anyOf方法类似于Java中的||)   
        Assert.assertThat(50, Matchers.anyOf(Matchers.greaterThan(20), Matchers.lessThan(40)));  
          
        //测试"abc.txt"是否以"txt"结束   
        Assert.assertThat("abc.txt", Matchers.endsWith("txt"));  
        Assert.assertThat("abc.txt", Matchers.startsWith("ab"));  
        Assert.assertThat("abc.txt", Matchers.containsString("c.t"));  
        Assert.assertThat(22+"aa", Matchers.hasToString("22aa"));  
        Assert.assertThat("http://blog.csdn.net/jadyer", Matchers.instanceOf(String.class));  
        Assert.assertThat("http://blog.csdn.net/jadyer", Matchers.notNullValue());  
        Assert.assertThat(null, Matchers.nullValue());  
          
        //针对集合的测试   
        String[] users = {"玄玉", "Jadyer"};  
        Assert.assertThat(users, Matchers.hasItemInArray("玄玉"));  
        Map userMap = new HashMap();  
        userMap.put("11", "玄玉");  
        userMap.put("22", "Jadyer");  
        userMap.put("33", "http://blog.csdn.net/jadyer");  
        Assert.assertThat(userMap, Matchers.hasKey("22"));  
        Assert.assertThat(userMap, Matchers.hasValue("http://blog.csdn.net/jadyer"));  
    }  
}