selenium phantomjs current_url bug minimal repro

selenium_phantomjs_bug_current_url.py

from selenium import webdriver
import sys

if 'phantom' in sys.argv:
    browser = webdriver.PhantomJS()
else:
    browser = webdriver.Firefox()

browser.implicitly_wait(3)

try:
    browser.get('http://www.google.com')
    start_url = browser.current_url
    browser.find_element_by_name('q').send_keys('foo\n')
    end_url = browser.current_url
    assert end_url != start_url
    print 'OK'

finally:
    browser.quit()

expected behaviour is that, after the send_keys call which includes a back-n (enter), we trigger a page load, which should complete before we're able to check current_url again...