window addEventHandler test

gistfile1.js

    describe('window.postMessage test', function() {
        var o;
        beforeEach(function(done) {
            o = {
              f: function() {}
            };
            // won't pass the spec
            // window.addEventListener('message', o.f, false);
            spyOn(o, 'f').and.callFake(function() {
                done();
            });
            // will pass the spec
            window.addEventListener('message', o.f, false);
            window.postMessage('another bam', '*');
        });
        it('works...', function() {
            expect(o.f).toHaveBeenCalled();
        });
    });

describe('window.postMessage test', function() {
    var o;
    beforeEach(function(done) {
        o = {
            f: function() {
                o.f2();
            },
            f2: function() {}
        };
        window.addEventListener('message', o.f, false);
        spyOn(o, 'f2').and.callFake(function() {
            done();
        });
        window.postMessage('another bam', '*');
    });
    it('works...', function() {
        expect(o.f2).toHaveBeenCalled();
    });
});