Is there a way to have a custom error on a custom matcher?

[Jeremy Lightsmith]

I'm trying to write a "toHaveClass" matcher, and it'd be nice if the
error the user saw was, "I expected a tag to have class (foo) but it
only had classes (bar, baz, and ralph)"

Can I do that in Jasmine?

[Jeremy Lightsmith]

Putting this in SpecHelper.js actually seems to do the trick.  Should this be in the docs somewhere?

beforeEach(function () {

    this.addMatchers({

        toHaveClass: function (expectedClass) {

            var node = this.actual;

            this.message = function (expectedClass) { 

                return [

                    "expected tag to have class (" + expectedClass + "), but it only had classes (" + this.actual.attr('class') + ")",

                    "expected tag not to have class (" + expectedClass + "), but it did",

                ]; }

            return node.hasClass(expectedClass);

        }

    })

});

----
Jeremy Lightsmith
Helping Software Teams Get More Productive with tools like Agile, Lean, & Rails
312-953-1193
http://jeremylightsmith.com/
http://facilitationpatterns.org/ (book in progress)
http://www.linkedin.com/in/jeremylightsmith

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[Christian Williams]

Yep, that's how you do it. It should definitely be in the docs, haven't gotten around to it yet, mea culpa.

I don't think you want to have "expectedClass" in the arg list for the message function though...?

--Xian