使用夹具进行QUnit奇怪行为，测试交替失败并通过

问题描述

我在QUnit中设置了以下内容：

I have the following set up in QUnit:

/* Dozen or so previous tests here */

test("Test some markup generation", function () {

    $('#qunit-fixture').plugin(); // jQuery plugin: Generates a table

    var rows = $('#qunit-fixture table tbody tr');
    count = rows.length;  // Count the rows
    console.log(count);

    equal(count, "96", "Expect the number of rows to be 96");
});

当它运行时，或当我刷新浏览器时，它交替地使这个测试显示count = 0，或者通过这个并失败所有以前的测试。测试之外没有定义全局变量。如果我手动将计数设置为96，一切都很顺利，或者如果我删除了这个测试，或者所有以前的测试，一切都会通过。我想知道是否有人遇到过这种行为？我之前使用过QUnit并且之前没有遇到过这种情况。

When it runs, or when I refresh the browser it alternately fails this test showing count = 0, or passes this and fails all the previous tests. There are no global variables defined outside the tests. If I set count to 96 by hand everything passes fine, or if I remove this test, or all the previous tests, everything also passes. I am wondering if anyone has run into this behavior? I've used QUnit quite a bit and have not encountered this before.

推荐答案

好的，我弄清楚了问题是什么与使用他们提供的夹具元素有关。 QUnit文档声明：

Ok, I figured out what the issue and it has to do with using their provided fixture element. The QUnit documentation states that:

通过重置它们意味着它将被清空，没有你可能添加到它的任何其他属性重启。看看我的问题，你可以看到我正在将插件直接应用到灯具中，并且所有添加的属性都会在下一个测试中出现，导致这些问题。

By reset they mean it will just be "emptied", not have any additional properties that you may have added to it be reset. Looking at my questions you can see I was applying the plugin directly to the fixture and all of the added properties were hanging around for the next test causing these issues.

每个测试我现在在夹具中插入一个新元素并使用插件定位：

Before each test I now insert a new element into the fixture and target that with the plugin:

$('#qunit-fixture').append('<div id="target"></div>');
$('#target').plugin();

这个添加的元素在每次测试后都会被正确清除。虽然这看起来很明显，但我从文档中并不是很清楚。

This added element then get cleared correctly after each test. While this seems obvious now it was not immediately clear to me from the documentation.

更新：

更改已提交并于2012年2月14日提交至QUnit：

Change submitted and pulled into QUnit on 14/2/2012: https://github.com/jquery/qunit/pull/195

谢谢，Jörn

这篇关于使用夹具进行QUnit奇怪行为，测试交替失败并通过的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！