[英]Chai expect to throw with error message
I'm trying to test the message of an Error
using expect().to.throw
. 我正在尝试使用expect().to.throw
来测试Error
的消息。 I read that expect needs to be passed a function to execute, as oppose to the function that returns. 我读到期望需要传递一个函数来执行,而不是返回的函数。 Anyways, I still can't seem to get this to work, I've tried a number of variations, but this is the basic setup in jsfiddle . 无论如何,我似乎仍然无法让这个工作,我尝试了很多变化,但这是jsfiddle的基本设置。 Any ideas why this won't work or how can I fix it? 任何想法为什么这不起作用或如何解决它?
Thank you 谢谢
The issue was that I was using throw
to check, but I wasn't actually throwing an error, but returning an Error
. 问题是我使用throw
来检查,但我实际上并没有抛出错误,而是返回Error
。 The following evaluates correctly: 以下评估正确:
expect(test.throwFunction()).to.be.an.instanceOf(Error).with.property('message', 'This is an error message')
However, I'm not sure this is the cleanest way to check - seems like there could be a shorthand version. 但是,我不确定这是最干净的检查方法 - 似乎可能有速记版本。
Update: Looks like there's a work in progress for adding to.be.an.error
更新:看起来正在进行添加to.be.an.error
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