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

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 mod

Answer 1

For coffeescript lovers

expect( => someMethodCall(arg1, arg2)).toThrow()

Answer 2

In my case the function throwing error was async so I followed here:

await expectAsync(asyncFunction()).toBeRejected();
await expectAsync(asyncFunction()).toBeRejectedWithError(...);

Answer 3

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(...),