Address PR feedback

cms/djangoapps/cms_user_tasks/signals.py

 """
 Receivers of signals sent from django-user-tasks
 """
+from __future__ import absolute_import, print_function, unicode_literals
+
 import logging
-from urlparse import urljoin
+from six.moves.urllib.parse import urljoin
 
 from django.core.urlresolvers import reverse
 from django.dispatch import receiver
@@ -11,6 +13,8 @@ from user_tasks.signals import user_task_stopped
 
 from .tasks import send_task_complete_email
 
+LOGGER = logging.getLogger(__name__)
+
 
 @receiver(user_task_stopped, dispatch_uid="cms_user_task_stopped")
 def user_task_stopped_handler(sender, **kwargs):  # pylint: disable=unused-argument
@@ -47,4 +51,4 @@ def user_task_stopped_handler(sender, **kwargs):  # pylint: disable=unused-argum
             # Need to str state_text here because it is a proxy object and won't serialize correctly
             send_task_complete_email.delay(status.name.lower(), str(status.state_text), status.user.email, detail_url)
         except Exception:  # pylint: disable=broad-except
-            logging.exception("Unable to queue send_task_complete_email")
+            LOGGER.exception("Unable to queue send_task_complete_email")

cms/djangoapps/cms_user_tasks/tests.py

@@ -4,7 +4,9 @@ Unit tests for integration of the django-user-tasks app and its REST API.
 
 from __future__ import absolute_import, print_function, unicode_literals
 
+import sys
 from uuid import uuid4
+import logging
 
 import mock
 from boto.exception import NoAuthHandlerFound
@@ -21,6 +23,24 @@ from user_tasks.serializers import ArtifactSerializer, StatusSerializer
 from .signals import user_task_stopped
 
 
+# Mock logging handler to check for expected logs.
+class MockLoggingHandler(logging.Handler):
+    def __init__(self, *args, **kwargs):
+        self.reset()
+        logging.Handler.__init__(self, *args, **kwargs)
+
+    def emit(self, record):
+        self.messages[record.levelname.lower()].append(record.getMessage())
+
+    def reset(self):
+        self.messages = {
+            'debug': [],
+            'info': [],
+            'warning': [],
+            'error': [],
+            'critical': [],
+        }
+
 # Helper functions for stuff that pylint complains about without disable comments
 
 def _context(response):
@@ -199,3 +219,14 @@ class TestUserTaskStopped(APITestCase):
             with mock.patch('cms_user_tasks.tasks.send_task_complete_email.retry') as mock_retry:
                 user_task_stopped.send(sender=UserTaskStatus, status=self.status)
                 self.assertTrue(mock_retry.called)
+
+    def test_queue_email_failure(self):
+        logger = logging.getLogger("cms_user_tasks.signals")
+        hdlr = MockLoggingHandler(level="DEBUG")
+        logger.addHandler(hdlr)
+
+        with mock.patch('cms_user_tasks.tasks.send_task_complete_email.delay') as mock_delay:
+            mock_delay.side_effect = NoAuthHandlerFound()
+            user_task_stopped.send(sender=UserTaskStatus, status=self.status)
+            self.assertTrue(mock_delay.called)
+            self.assertEqual(hdlr.messages['error'][0], u'Unable to queue send_task_complete_email')