老程序员分享：JUnit——assertThat(acture,matcher)

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使用hamcrest之前需要引入相关的jar包，包括hamcrest-core.1.3.jar和hamcrest-library-1.3.jar。

具体引入的方法为：右击JUnit工程——build path——add external archives

这时在真正测试的时候，还需要引入静态方法import static org.hamcrest.Matchers.*;

package com.bjsxt.junit4.test;

import static org.junit.Assert.*;

import static org.hamcrest.Matchers.*;

import org.junit.Test;

import com.bjsxt.junit4.T;

public class TTest {

@Test

public void testAdd() {

int z = new T().add(5,3);

assertThat(z,is(8));

}

}

运行后会报错：

java.lang.SecurityException: class ""org.hamcrest.Matchers""'s //代码效果参考：https://v.youku.com/v_show/id_XNjM5ODc4MDAzNg==.html

原因：

JUnit4和hamcrest包的class loader不是同一个

解决方案如下所示：

(1)删除junit包里面的jar包即eclipse自带的library：JUnit4——右击build path——remove

(2)引入最新版本的library的jar包

1.assertThat

2.使用hamcrest的匹配方法

a)更自然

3.示例

a)assertThat( n, allOf( greaterThan(1), lessThan(15) ) );

assertThat( n, anyOf( greaterThan(16), lessThan(8) ) );

assertThat( n, anything() );

assertThat( str, is( ""bjsxt"" ) );//字符串是不是”bjsxt”

assertThat( str, not( ""bjxxt"" ) );

b)assertThat( str, containsString( ""bjsxt"" ) );

assertThat( str, endsWith(""bjsxt"" ) );

assertThat( str, startsWith( ""bjsxt"" ) );

assertThat( n, equalTo( nExpected ) );

assertThat( str, equalToIgnoringCase( ""bjsxt"" ) ); //字符串忽略大小写是否相等

assertThat( str, equalToIgnoringWhiteSpace( ""bjsxt"" ) ); //字符串忽略空格是否相等

c)assertThat( d, closeTo( 3.0, 0.3 ) );//数值接近3.0 误差不超过0.3

assertThat( d, greaterThan(3.0) );

assertThat( d, lessThan (10.0) );

assertThat( d, greaterThanOrEqualTo (5.0) );//大于等于

assertThat( d, lessThanOrEqualTo (16.0) );

d)assertThat( map, hasEntry( ""bjsxt"", ""bjsxt"" ) );//map里面key-value判断

assertThat( iterable, hasItem ( ""bjsxt"" ) );

assertThat( map, hasKey ( ""bjsxt"" ) );

assertThat( map, hasValue ( ""bjsxt"" ) );