如何编写一个期望在Jasmine中抛出Error的测试？ [英] How to write a test which expects an Error to be thrown in Jasmine?

问题描述

我正在尝试为 Jasmine测试框架编写测试，该测试需要出错。目前我正在使用与GitHub集成的Jasmine Node.js 。

I'm trying to write a test for the Jasmine Test Framework which expects an error. At the moment I'm using a Jasmine Node.js integration from GitHub.

在我的Node模块中，我有以下代码：

In my Node module I have the following code:

throw new Error("Parsing is not possible");

现在我尝试编写一个预期会出现此错误的测试：

Now I try to write a test which expects this error:

describe('my suite...', function() {
    [..]
    it('should not parse foo', function() {
    [..]
        expect(parser.parse(raw)).toThrow(new Error("Parsing is not possible"));
    });
});

我也试过错误（）和一些其他变种，只是无法弄清楚如何使它工作。

I tried also Error() and some other variants and just can't figure out how to make it work.

推荐答案

你应该将一个函数传递给 expect（...）致电。你在这里的代码：

you should be passing a function into the expect(...) call. The code you have here:

// incorrect:
expect(parser.parse(raw)).toThrow(new Error("Parsing is not possible"));

试图调用 parser.parse （原始）试图将结果传递给 expect（...），

is trying to actually call parser.parse(raw) in an attempt to pass the result into expect(...),

尝试使用匿名函数：

expect( function(){ parser.parse(raw); } ).toThrow(new Error("Parsing is not possible"));

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