bitbake: toaster: browser tests - add Selenium Docker container as driver

Adds the ability to specify a Selenium Docker container server as
a driver. This allows for repeatable tests independent of host.
Currently we assume you are using the Firefox container. Instructions
are located in the README in tests/browser.

(Bitbake rev: 7df842f8f8b2ae640109ed06729ab59c9469fc64)

Signed-off-by: brian avery <brian.avery@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/toaster/tests/browser/README

@@ -18,7 +18,7 @@ To run tests against Chrome:
 * On Windows, put chromedriver.exe in the same directory as chrome.exe
 
 To run tests against PhantomJS (headless):
-
+--NOTE - Selenium seems to be deprecating support for this mode ---
 * Download and install PhantomJS:
   http://phantomjs.org/download.html
 * On *nix systems, put phantomjs on PATH
@@ -43,13 +43,30 @@ Marionette driver.)
 The test cases will instantiate a Selenium driver set by the
 TOASTER_TESTS_BROWSER environment variable, or Chrome if this is not specified.
 
+To run tests against the Selenium Firefox Docker container:
+More explanation is located at https://wiki.yoctoproject.org/wiki/TipsAndTricks/TestingToasterWithContainers
+* Run the Selenium container:
+  ** docker run -it --rm=true -p 5900:5900 -p 4444:4444 --name=selenium selenium/standalone-firefox-debug:2.53.0
+  *** 5900 is the default vnc port. If you are runing a vnc server on your machine map a different port e.g. -p 6900:5900 and connect vnc client to 127.0.0.1:6900
+  *** 4444 is the default selenium sever port.
+* Run the tests
+  ** TOASTER_TESTS_BROWSER=http://127.0.0.1:4444/wd/hub TOASTER_TESTS_URL=http://172.17.0.1:8000 ./bitbake/lib/toaster/manage.py test --liveserver=172.17.0.1:8000 tests.browser
+  ** TOASTER_TESTS_BROWSER=remote TOASTER_REMOTE_HUB=http://127.0.0.1:4444/wd/hub ./bitbake/lib/toaster/manage.py test --liveserver=172.17.0.1:8000 tests.browser
+  *** TOASTER_REMOTE_HUB - This is the address for the Selenium Remote Web Driver hub. Assuming you ran the contianer with -p 4444:4444 it will be http://127.0.0.1:4444/wd/hub.
+  ***  --liveserver=xxx tells Django to run the test server on an interface and port reachable by both host and container.
+  **** 172.17.0.1 is the default docker bridge on linux, viewable from inside and outside the contianers. Find it with "ip -4 addr show dev docker0"
+* connect to the vnc server to see the tests if you would like
+   ** xtightvncviewer 127.0.0.1:5900
+   ** note, you need to wait for the test container to come up before this can connect.
+
 Available drivers:
 
 * chrome (default)
 * firefox
 * marionette (for newer Firefoxes)
 * ie
-* phantomjs
+* phantomjs (deprecated)
+* remote
 
 e.g. to run the test suite with phantomjs where you have phantomjs installed
 in /home/me/apps/phantomjs:

bitbake/lib/toaster/tests/browser/selenium_helpers_base.py

@@ -39,7 +39,7 @@ from selenium.webdriver.common.desired_capabilities import DesiredCapabilities
 from selenium.common.exceptions import NoSuchElementException, \
         StaleElementReferenceException, TimeoutException
 
-def create_selenium_driver(browser='chrome'):
+def create_selenium_driver(cls,browser='chrome'):
     # set default browser string based on env (if available)
     env_browser = os.environ.get('TOASTER_TESTS_BROWSER')
     if env_browser:
@@ -59,6 +59,15 @@ def create_selenium_driver(browser='chrome'):
         return webdriver.Ie()
     elif browser == 'phantomjs':
         return webdriver.PhantomJS()
+    elif browser == 'remote':
+        # if we were to add yet another env variable like TOASTER_REMOTE_BROWSER
+        # we could let people pick firefox or chrome, left for later
+        remote_hub= os.environ.get('TOASTER_REMOTE_HUB')
+        driver = webdriver.Remote(remote_hub,
+                                  webdriver.DesiredCapabilities.FIREFOX.copy())
+
+        driver.get("http://%s:%s"%(cls.server_thread.host,cls.server_thread.port))
+        return driver
     else:
         msg = 'Selenium driver for browser %s is not available' % browser
         raise RuntimeError(msg)
@@ -135,7 +144,7 @@ class SeleniumTestCaseBase(unittest.TestCase):
 
         # instantiate the Selenium webdriver once for all the test methods
         # in this test case
-        cls.driver = create_selenium_driver()
+        cls.driver = create_selenium_driver(cls)
         cls.driver.maximize_window()
 
     @classmethod