Add the ability to run local browser tests.

test/browser.py

 # This file is part of the Juju GUI, which lets users view and manage Juju
 # environments within a graphical interface (https://launchpad.net/juju-gui).
 # Copyright (C) 2012-2013 Canonical Ltd.
 #
 # This program is free software: you can redistribute it and/or modify it under
 # the terms of the GNU Affero General Public License version 3, as published by
 # the Free Software Foundation.
 #
 # This program is distributed in the hope that it will be useful, but WITHOUT
 # ANY WARRANTY; without even the implied warranties of MERCHANTABILITY,
@@ skipping 193 matching lines @@
         # problematic (i.e. connection errors) when switching from the sandbox
         # mode back to the staging backend.
         local_prefix = 'local-'
         if browser_name.startswith(local_prefix):
             # If the browser name has the "local-" prefix, i.e. "local-chrome',
             # "local-firefox" or "local-ie", start the associated local driver.
             name = browser_name[len(local_prefix):]
             capabilities = get_capabilities(name)
             driver = make_local_driver(name, capabilities)
             cls.remote_driver = False
-            printerr('* Platform: local {}'.format(get_platform(driver)))

[benji, 2013/12/10 15:50:31]

This was annoying and non-useful.

         else:
             # Otherwise, set up a Saucelabs remote driver.
             capabilities = get_capabilities(browser_name)
             user = getpass.getuser()
             capabilities.update({'name': 'Juju GUI', 'tags': user})
             driver = selenium.webdriver.Remote(
                 desired_capabilities=capabilities,
                 command_executor=command_executor)
             cls.remote_driver = True
             details = 'https://saucelabs.com/jobs/' + driver.session_id
             printerr(
                 '* Platform: {}'.format(get_platform(driver)),
                 '* Testcase: {}'.format(cls.__name__),
                 '* Details: {}'.format(details),
                 sep='\n',
             )
         # Enable implicit waits for all browsers (DOM polling behavior)
         driver.implicitly_wait(20)
         driver.set_script_timeout(30)
         # We want to tell saucelabs when all the tests are done.
-        cls.app_url = os.environ['APP_URL']
+        cls.app_url = os.environ.get('APP_URL', 'http://localhost:8888')
         cls.driver = driver
 
     @classmethod
     def tearDownClass(cls):
         cls.driver.quit()
 
     def run(self, result=None):
         self.last_result = result
         super(TestCase, self).run(result)
 
@@ skipping 185 matching lines @@
             printerr('\n- restarting API backend using juju ssh...')
             juju('ssh', '-e', 'juju-gui-testing', 'juju-gui/0',
                  'sudo', 'service', 'juju-api-improv', 'restart')
         self.load()
         self.handle_browser_warning()
         self.wait_for_script(
             'return app && app.env.get("connected");',
             error='Impossible to connect to the API backend after restart.',
             timeout=30)
         printerr('- done')