A selenium webdriverjs test that hangs getting element text

gistfile1.js

var assert = require('assert'),
    test = require('selenium-webdriver/testing'),
    webdriver = require('selenium-webdriver'),
    SeleniumServer = require('selenium-webdriver/remote').SeleniumServer;


var driver = new webdriver.Builder().
    usingServer("http://localhost:9515").
    withCapabilities(webdriver.Capabilities.chrome()).
    build();


test.describe('getting main page', function() {
    test.it('should be able to get the header text', function(){
        driver.get('http://localhost:8080/?epub=epub_content%2Flinear-algebra')
        .then(function() {
            driver.sleep(1000);
            driver.switchTo().frame('epubContentIframe');
        })
        .then(function() {
            var allElements = driver.findElements({tagName: 'h1'});
            allElements.then(function(val){
                console.log("Got all elements=" + val.length);
                val[0].getText().then(function(txt) {
                    console.log("element text=" + txt);
                });
            });
        })
    });
});