使用Vue和testing-library时,确认一个元素是否被v-show隐藏的最佳方法是什么?

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英文:

When using testing-library with Vue, what is the best way to confirm an element is hidden by v-show?

问题

使用 testing-library 与 Vue 一起时,轻松检查元素是否不在 DOM 中。

例如,当元素的 v-iffalse 时:

element = screen.queryByTestId("my-element")
expect(element).toBeNull()

然而,当使用 v-show 时,元素不会从 DOM 中删除,而是通过内联样式 display: none 切换,因此上述方法不起作用。

可以像这样操作:

element = screen.queryByTestId("my-element")
expect(element.style.display).toEqual("none")

但这感觉有点脆弱。有更好的处理方法吗?

英文:

When using testing-library with Vue it is easy to check if an element is not present in the DOM.

For example when v-if for the element is false:

element = screen.queryByTestId("my-element")
expect(element).toBeNull()

However when using v-show the element isn't removed from the DOM, it is toggled via an inline style of display: none, so the above won't work.

I can do something like this:

element = screen.queryByTestId("my-element")
expect(element.style.display).toEqual("none")

But this feels somewhat brittle. Is there a better way to handle this?

答案1

得分: 2

@testing-library/vueQuickstart中:

> 你可能也会对安装@testing-library/jest-dom感兴趣,这样你就可以使用自定义的Jest匹配器来检查DOM。

匹配器包括.toBeVisible()描述如下

> 这允许你检查元素是否当前对用户可见。
>
> 元素可见的条件包括:
> - 它的css属性display不设置为none
> - 它的css属性visibility不设置为hiddencollapse
> - 它的css属性opacity不设置为0
其父元素也是可见的(以此类推直到DOM树的顶部)
> - 它没有hidden属性
> - 如果是<details />,它有open属性

注意:jest-dom不关心您使用哪个框架。它评估HTML和CSS的值,不管哪个指令生成这些值。HTML和CSS输出是用户的浏览器接收到的内容。

附注:既然你提到了,检查元素是否在DOM中应该使用expect(queryBy*(*))[.not].toBeInTheDocument()来完成。
在最新版本的@testing-library中,其中包含非常有帮助的linting规则,建议使用getBy*查询来断言在DOM中存在,并使用queryBy*来断言不存在。

英文:

From @testing-library/vue's Quickstart:

> You may also be interested in installing @testing-library/jest-dom so you can use the custom Jest matchers for the DOM.


The matchers contain .toBeVisible(), described as:

> This allows you to check if an element is currently visible to the user.
>
>An element is visible if all the following conditions are met:
> - it does not have its css property display set to none
> - it does not have its css property visibility set to either hidden or collapse
> - it does not have its css property opacity set to 0
its parent element is also visible (and so on up to the top of the DOM tree)
> - it does not have the hidden attribute
> - if <details /> it has the open attribute


Note: jest-dom doesn't care what framework you use. It evaluates HTML & CSS values, regardless of what directives generate those values. HTML and CSS output is what the user's browser receives.

Side-note: since you mentioned it, checking if an element is in DOM should be done with expect(queryBy*(*))[.not].toBeInTheDocument().
In the latest version of @testing-library, which contains very helpful linting rules, the recommendation is to use getBy* queries for asserting presence in DOM and queryBy* for asserting absence.

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  • 本文由 发表于 2023年6月15日 06:23:30
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