unable to fire event

gistfile1.js

zombie = require('zombie');
assert = require('assert');
vows = require('vows');

url = "http://localhost:4568/";

// Load the page from localhost

vows.describe('The tags page').addBatch({
    'Presence' : {
        topic : function() {
            //The zombie callback is a function with three args:
            // function(error, browser, status){...};
            zombie.visit(url + "tags", this.callback);
        },
        'should be ok': function(e, b, s){
            assert.equal(s, "200");
        },
        'should have the right title': function(e,b,s){
            assert.equal(b.text("#header > h1"), "All tags");
        }
    },

    'Adding a new tag': {
        topic: function(){
            zombie.visit(url+"tags", this.callback);
        },
        'after submitting tag name': {
            topic : function(b) {
                b.fill("tag[content]", "holograms").
                    pressButton("Add tag", this.callback);
            },
            'it should be successful' : function(b) {
                assert.equal(b.response[0], "200");
            },
            'it should show the new tag' : function(b) {
                assert.ok(b.querySelector(".info_for_tag"));
                assert.match(b.text(".info_for_tag a"), /\s*holograms\s*/);
            },
            'after hovering on new tag' : {
                topic : function(b) {
                    // This function does not work *error message below
                    b.fire("mouseOver", '.info_for_tag');
                    // This doesn't work either
                    // b.fire("click", '.info_for_tag a');
                    b.wait(this.callback);
                },
                'it should change class' : function(b){
                    console.log(b.response[2]);
                    assert.ok(b.querySelector(".unused_tag"));
                }
            }
                    
                    

        }
    }

}).export(module);

/* THE ERROR MESSAGE */
♢ The tags page

  Presence
    ✓ should be ok
    ✓ should have the right title
  Adding a new tag after submitting tag name
    ✓ it should be successful
    ✓ it should show the new tag

node.js:134
        throw e; // process.nextTick error, or 'error' event on first tick
        ^
TypeError: Object .info_for_tag a has no method 'dispatchEvent'
    at Browser.fire (/home/p/code/nejiro/node_modules/zombie/lib/zombie/browser.js:173:14)
    at Object.<anonymous> (/home/p/code/nejiro/spec/js/ajax_test.js:42:23)
    at run (/home/p/code/nejiro/node_modules/vows/lib/vows/suite.js:130:31)
    at EventEmitter.<anonymous> (/home/p/code/nejiro/node_modules/vows/lib/vows/suite.js:203:40)
    at EventEmitter.emit (events.js:81:20)
    at /home/p/code/nejiro/node_modules/vows/lib/vows/context.js:32:52
    at /home/p/code/nejiro/node_modules/vows/lib/vows/context.js:46:29
    at Browser.<anonymous> (/home/p/code/nejiro/node_modules/zombie/lib/zombie/browser.js:148:18)
    at Browser.<anonymous> (/home/p/code/nejiro/node_modules/zombie/lib/zombie/browser.js:9:60)
    at Browser.emit (events.js:64:17)

I'm writing my tests in coffeescript and using vows-bdd to run them, so it's not as tedious as js + vows. Is it possible to test a node.js app from capybara-webkit?

I think it should be, but you would probably have to write the tests themselves in ruby.