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<http://blog.csdn.net/jadyer>
*/
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<String, String> userMap = new HashMap<String, String>();
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"));
}
}