Merge pull request #4638 from edx/zoldak/lettuce-log-js-console

Capture console log on lettuce test failure

common/djangoapps/terrain/browser.py

@@ -17,7 +17,6 @@ from base64 import encodestring
 from json import dumps
 
 import xmodule.modulestore.django
-from xmodule.modulestore import ModuleStoreEnum
 from xmodule.contentstore.django import _CONTENTSTORE
 
 # There is an import issue when using django-staticfiles with lettuce
@@ -94,6 +93,14 @@ def initial_setup(server):
     if world.LETTUCE_SELENIUM_CLIENT == 'local':
         browser_driver = getattr(settings, 'LETTUCE_BROWSER', 'chrome')
 
+        if browser_driver == 'chrome':
+            desired_capabilities = DesiredCapabilities.CHROME
+            desired_capabilities['loggingPrefs'] = { 'browser':'ALL' }
+        elif browser_driver == 'firefox':
+            desired_capabilities = DesiredCapabilities.FIREFOX
+        else:
+            desired_capabilities = {}
+
         # There is an issue with ChromeDriver2 r195627 on Ubuntu
         # in which we sometimes get an invalid browser session.
         # This is a work-around to ensure that we get a valid session.
@@ -106,7 +113,7 @@ def initial_setup(server):
             # the browser session is invalid, this will
             # raise a WebDriverException
             try:
-                world.browser = Browser(browser_driver)
+                world.browser = Browser(browser_driver, desired_capabilities=desired_capabilities)
                 world.browser.driver.set_script_timeout(GLOBAL_SCRIPT_TIMEOUT)
                 world.visit('/')
 
@@ -221,6 +228,25 @@ def screenshot_on_error(scenario):
             LOGGER.error('Could not capture a screenshot')
 
 
+@after.each_scenario
+def capture_console_log(scenario):
+    """
+    Save the console log to help with debugging.
+    """
+    if scenario.failed:
+        log = world.browser.driver.get_log('browser')
+        try:
+            output_dir = '{}/log'.format(settings.TEST_ROOT)
+            file_name = '{}/{}.log'.format(output_dir, scenario.name.replace(' ', '_'))
+
+            with open (file_name, 'w') as output_file:
+                for line in log:
+                    output_file.write("{}{}".format(dumps(line), '\n'))
+
+        except WebDriverException:
+            LOGGER.error('Could not capture the console log')
+
+
 def capture_screenshot_for_step(step, when):
     """
     Useful method for debugging acceptance tests that are run in Vagrant.