Highland stream consume push within promise fail

highlandjunk.js

var util = require('util'),
    cheers = require('cheers'),
    _ = require('highland'),
    Q = require('q');

function JunkStrat() {}

JunkStrat.prototype.authorStream = function() {
    return _(['a', 'b', 'c', 'd']);
};

JunkStrat.prototype.linkStream = function() {
    var self = this;
    return this.authorStream()
        .consume(function(err, res, push, next) {
            self.getPromise().then(function() {
                push(null, res);
                next(self.linkPageStream(1));
            });
        });
};

JunkStrat.prototype.linkPageStream = function(x) {
    var self = this;
    return _(function(push, next) {
        push(null, x);
        next(self.linkPageStream(x + 1));
    });
};

JunkStrat.prototype.getPromise = function() {
    var q = Q.defer();

    setTimeout(function() {
        q.resolve();
    }, 1000);

    return q.promise;
};

module.exports = JunkStrat;

Here's a test for this which fails:

    describe 'junk', ->
        beforeEach ->
            @junkS = new require('junk')()

        it 'article link stream should be populated', (done) ->
            links = @junkS.linkStream()
            links.take(3).toArray((result) ->
                console.log(result)
                done
            )