
First Grok the interface to register them:

  >>> grok('silva.fanstatic.tests.dependencies.external_fixture')

Open the page to verify the rendering:

  >>> browser = get_browser()
  >>> browser.options.handle_errors = False
  >>> browser.open('/root/full.html')
  200

And check the rendering link the CSS and Javascript files:

  >>> print browser.html.xpath('//script/@src')
  ['http://silvacms.org/framework.js',
   'http://silvacms.org/tracker.js']
  >>> print browser.html.xpath('//link/@href')
  ['http://infr.ae/tracker.css']
