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TestUtils.renderLightbox = function(dispatcher, lightboxDefn, opt_location, callback) {
    var Foo = React.createClass({
        getChildContext: function() {
            return { dispatcher: dispatcher };
        },

        childContextTypes: {
            dispatcher: React.PropTypes.object.isRequired
        },

        render: function() {
            var transitions = lightboxDefn.transitions || {};
            return React.createElement(LightboxHandler,
                                       { nextTransition: transitions.next,
                                         prevTransition: transitions.prev,
                                         elem: lightboxDefn.element,
                                         elemProps: lightboxDefn.props });
        }
    });

    var cb, location;
    if (typeof opt_location === 'string') {
        location = new TestLocation([opt_location]);
        cb = callback;
    } else {
        location = new TestLocation(['/']);
        cb = arguments[2];
    }

    var routes = (
        <Router.Route name="default" handler={Foo} path="/" />
    );

    var root;
    Router.run(routes, location, function(Handler, state) {
        var root = TestUtils.renderIntoDocument(<Handler {...state} />);
        cb && cb(root, location);
    });

    return root;
};