如何编写一个期望在 Jasmine 中抛出“错误"的测试?

问题描述

我正在尝试为 Jasmine 测试框架 编写一个测试，它预计会出错.目前我正在使用来自 GitHub 的 Jasmine Node.js 集成.

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.js 模块中，我有以下代码:

In my Node.js module I have the following code:

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

现在我尝试编写一个预期此错误的测试:

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"));
    });
});

我也尝试了 Error() 和其他一些变体，但不知道如何使它工作.

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

推荐答案

尝试使用匿名函数:

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

您应该将一个函数传递给 expect(...) 调用.您的错误代码:

you should be passing a function into the expect(...) call. Your incorrect code:

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

正在尝试实际调用 parser.parse(raw) 以尝试将结果传递给expect(...)，

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

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