How to write a test which expects an Error to be thrown in Jasmine

0 votes

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

Jul 13, 2020 in Node-js by kartik
• 37,530 points
910 views

1 answer to this question.

0 votes

Hello @kartik,

Try using an anonymous function instead:

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

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"));

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

Hope this is helpful!!
Thank you!!

answered Jul 13, 2020 by Niroj
• 82,880 points

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