Assert.assertEquals()方法参数详解

junit.framework包下的asrt提供了多个断言方法. 主用于比较测试传递进去的两个参数.

asrt.asrtequals();及其重载方法:

以asrt.asrtequals(int expected, int actual)为例:

/** * asrts that two ints are equal. 断言两个int是相等的 */static public void asrtequals(int expected, int actual) {    asrtequals(null, expected, actual);}

可以看到里面调用了asrtequals(string message, int expected, int actual)方法:

/** * asrts that two ints are equal. if they are not * an asrtionfailederror is t理学是什么hrown with the given message. * 如果不抛出带有 message 的异常(asrtionfailederror)信息, 则表明两者相等 */static public void asrtequals(string message, int expected, int actual) {    asrtequals(message, integer.valueof(expected), integer.valueof(actual));}

可以看到, 这里把int类型封箱成为integer类型. 注释说, 会抛异常, 但这里没有. 没关系, 我们接着看里面调用: asrtequals(string message, object expected, object actual)方法:

/** * asrts that two objects are equal. if they are not * an asrtionfailederror is thrown with the given message. * 如果不抛出带有 message 的异常(asrtionfailederror)信息, 则表明两者相等(这里比较的是object对象) */static public void asrtequals(string message, object expected, object actual) {    if (expected == null && actual == null) {        return;    }    if (expected != null && expected.equals(actual)) {        return;    }    failnotequals(message, expected, actual);}

两个if语句, 判断了两者相等的情况: 引用(地址)相等或者内容相等. 如果这两种if情况都不命中, 那么表明1参和比较财政学2参实际是不相等, 所以代码会往下执行failnotequals(string message, object expected, object actual)方法，并在此方法中抛出异常, 接下来就比较简单了:

static public void failnotequals(string message, object expected, object actual) {    fail(format(message, expected, actual));}public static string format(string message, object expected, object actual) {    string formatted = "";    if (message != null && message.length() > 0) {        formatted = message + " ";    }    return formatted + "expected:<" + expected + "> but was:<" + actual + ">";}/*** fails a test with the given message.*/static public void fail(string message) {if (message == null) {    throw new asrtionfailederror();}throw new asrtionfailederror(message);}

以上可以看出, 最终是由fail(string message)这个方法抛出异常信息!!

asrt.asrtequals()使用方法:

使用, 示例代码:

asrt.asrtequals(true, arry.contains("hello"));asrt.asrtequals(39991l, aa.getlong("key3", 0l));asrt.asrtequals(true, bb.getboolean("key4", fal));asrt.asrtequals(5.3f, cc.getfloat("key5", 0.f));asrt.asrtequals(99, dd.getint("key6", 1));asrt.asrtequals("如果打印本信息, 证明参数不相等", 10l, 10);

按照源码分析, 我们可以把一个预期结果作为1参传递进去. 2参传递我们需要测试的方法. 然后执行. 相等, 代码继续往下执行, 不相等, 中断执行, 抛出异常信息!!!

略作一提:

asrt.asrtsame(object expected, object actual)方法:

其比较的是引用地址是否相等, 并没有对内容进行比较:

/** * asrts that two objects refer to怎么qq空间打不开 the same object. if they are not * the same an asrtionfailederror is河南查分系统入口 thrown. */static public void asrtsame(object expected, object actual) {    asrtsame(null, expected, actual);}/** * asrts that two objects refer to the same object. if they are not * an asrtionfailederror is thrown with the given message. */static public void asrtsame(string message, object expected, object actual) {    if (expected == actual) {        return;    }    failnotsame(message, expected, actual);}

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