工具分享：JsMockito (JavaScript 单元测试工具)

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JsMockito

用过Rhino Mocks后大家一定对它印象深刻，用它来做单元测试的case相当的省事。今天咱们同样来介绍一款Mock工具：JsMockito，用它能轻松的制作JavaScript程序的单元测试case。

JsMockito的运行还依赖另外一款开源的JS工具：JsHamcrest，我们可以通过如下代码来搭建测试环境：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml" ><head>    <title>Test JavaScript Mock</title>    <script src="jshamcrest.js" language="javascript" type="text/javascript"></script>    <script src="jsmockito.js" language="javascript" type="text/javascript"></script>    <script language="javascript" type="text/javascript">        var mockFunc = JsMockito.mockFunction();        JsMockito.when(mockFunc)('jim').thenReturn('hello jim');        alert(mockFunc('jim'));    </script></head><body></body></html>

模拟JS的原生对象

        var mockArray = JsMockito.mock(Array);        JsMockito.when(mockArray).slice(10).thenReturn('^__^');        alert(mockArray.slice(10));  //结果是: ^__^

模拟对象的方法

        bob = {            FullName: 'bob ling',            Introduce: function () { return 'im bob'; }        };        var mockIntroduce = JsMockito.mockFunction();        JsMockito.when(mockIntroduce)().thenReturn("it's ok!");        bob.Introduce = mockIntroduce;        alert(bob.Introduce()); //结果是： it's ok

模拟对象的属性

        var mockBob = JsMockito.mock(bob);        mockBob.FullName = 'Bruce Lee';        alert(mockBob.FullName);//结果是：Bruce Lee

模拟对象的方法（根据输入参数的情况来返回结果）

        var mockFunction = JsMockito.mockFunction();        JsMockito.when(mockFunction)(JsHamcrest.Matchers.lessThan(10) && JsHamcrest.Matchers.greaterThan(5), JsHamcrest.Matchers.anything()).thenReturn('this value must belong 5 to 10');        alert(mockFunction(6, null)); //this value must belong 5 to 10        alert(mockFunction(2, null));//undefined

模拟对象的方法（根据调用环境的不同来返回结果）

        context1 = {};        context2 = {};        var mockFunc = JsMockito.mockFunction();        JsMockito.when(mockFunc).call(context1).thenReturn('this method was called by context');        alert(mockFunc.apply(context1)); //this method was called by context        alert(mockFunc.apply(context2)); //undefined        alert(mockFunc.call(context1)); //this method was called by context        alert(mockFunc.call(context2)); //undefined