量角器映射函数返回undefined

问题描述：

鉴于一个应用程序上有多个小部件，每个小部件都有自己的标题和诸如此类的东西，我想映射每个小部件的元素，以便在测试中轻松处理。

Given an app with multiple widgets on it, each with their own title and whatnot, I would like to map each widget's elements, to make them easy to handle in tests.

例如，页面：

this.widgets = element.all(by.css('ul.widget-grid')).map(function(widget, index) {
    return {
        index: index,
        title: widget.element(by.css('div.title')).getText()
    };
});

然后在我的规范中：

expect(page.widgets[0].index).toBe(0);
expect(page.widgets[0].title).toBe('The Title');

不幸的是，我预计会返回 undefined 。

Unfortunately, my expects are returning undefined.

我做错了什么？我正在使用Protractor 2.0。

What am I doing wrong? I'm using Protractor 2.0.

答

这让我很困惑所以我想我会添加一个答案来帮助别人......

This confused me so I thought I'd add an answer to help others...

虽然我明白 map（）会返回一个承诺，因为我在期待，我认为它会被解决，然后应该像一个数组。不。它返回一个看起来像数组的对象，但是不是一个数组。

While I understood that map() returns a promise, because I was using it in an expect, I thought it would be resolved, and then should act like an array. Nope. It returns an object, that looks like an array, but is not an array.

量角器映射函数返回undefined

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