Test for expected failure in Mocha

Question

Using Mocha, I am attempting to test whether a constructor throws an error. I haven\'t been able to do this using the expect syntax, so I\'d like to do the following:

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Answer 1

If you are using should.js you can do (new ErrorThrowingObject).should.throw('Option Error Text or Regular Expression here')

If you don't want to should a separate library, you could also do something like this:

it('should do whatever', function(done) {
    try {
        ...
    } catch(error) {
        done();
    }
}

This way, you know the error is caught if the test finishes. Otherwise, you will get a timeout error.