如何编写一个期望 Jasmine 出错的测试？

Question

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.

In my Node module I have the following code:

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

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"));
    });
});

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

转载于:https://stackoverflow.com/questions/4144686/how-to-write-a-test-which-expects-an-error-to-be-thrown-in-jasmine

Answer 1

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"));

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

Try using an anonymous function instead:

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