测试JavaScript单击使用Sinon的事件 [英] Testing JavaScript Click Event with Sinon
问题描述
我正在尝试制作一些测试，以便能够更好地理解如何使用Mocha，Chai，Sinon和jQuery的组合来测试DOM事件。我想检查单击div元素时是否正确触发了警报功能。我知道HTML元素的设置是正确的jQuery，但我不完全确定如何为下面的代码生成传递测试。特别奇怪的是，我在浏览器中打开HTML文件时出现对话，所以我知道'$（'＃thingy'）行。触发器（'click'）'正在做我期望的事情。我目前得到以下内容，'TypeError：对象不是函数'
I am trying to produce some test to be able to better understand how to test DOM events with the combination of Mocha, Chai, Sinon and jQuery. I want to check that the alert function is correctly triggered on a click of the div element. I know that the setup of the HTML element is correct jQuery, but I'm not entirely sure how to produce a passing test for the code below. What's particularly strange is that I get a dialogue appearing on opening the HTML file in my browser, so I know the line '$('#thingy').trigger('click')' is doing what I'd expect. I am currently getting the following, 'TypeError: object is not a function'
我的测试文件的相关部分，tests.js
Relevant section from my test file, tests.js
describe('DOM tests - div element', function() {
$("body").append("<div id='thingy'>hello world</div>")
$('#thingy').attr('class', 'thingy');
$('#thingy').click(function() { alert( "I've been clicked!" ); });
it('should have called alert function', function () {
var spy = sinon.spy(alert);
$('#thingy').trigger('click')
sinon.assert(spy.called);
});
我的HTML文件相当标准，index.html
My HTML file is fairly standard, index.html
<!doctype html>
<html>
<head>
<title>Tests</title>
<link rel="stylesheet" href="mocha.css" />
<script src="http://code.jquery.com/jquery-1.11.1.min.js"></script>
</head>
<body>
<div id="mocha"></div>
<script src="mocha.js"></script>
<script src="chai.js"></script>
<script src="sinon-1.10.2.js"></script>
<script>
mocha.ui('bdd');
mocha.reporter('html');
var expect = chai.expect;
</script>
<script src="tests.js"></script>
<script>
mocha.run();
</script>
</body>
推荐答案
你实际上没有调用 alert 函数，你正在调用 window.alert 函数，所以你需要监视：
You're not actually calling an alert function, you're calling the window.alert function, so you need to spy on that:
it('should have called alert function', function () {
var _savedAlert = window.alert;
try {
var spy = sinon.spy(window, 'alert');
$('#thingy').trigger('click');
sinon.assert.called(spy);
}
finally { window.alert = _savedAlert; }
});
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