Merge pull request #21301 from edx/feanil/fix_test_collection

Fix some test collection in python 3.

cms/djangoapps/contentstore/views/assets.py

@@ -19,7 +19,7 @@ from opaque_keys.edx.keys import AssetKey, CourseKey
 from pymongo import ASCENDING, DESCENDING
 from six import text_type
 
-from contentstore.utils import reverse_course_url
+from ..utils import reverse_course_url
 from contentstore.views.exception import AssetNotFoundException, AssetSizeTooLargeException
 from edxmako.shortcuts import render_to_response
 from openedx.core.djangoapps.contentserver.caching import del_cached_content

cms/djangoapps/contentstore/views/tests/test_videos.py

@@ -10,7 +10,6 @@ import re
 from contextlib import contextmanager
 from datetime import datetime
 from functools import wraps
-from StringIO import StringIO
 
 import dateutil.parser
 import ddt
@@ -1417,7 +1416,7 @@ class VideoUrlsCsvTestCase(VideoUploadTestMixin, CourseTestCase):
             response["Content-Disposition"],
             u"attachment; filename={course}_video_urls.csv".format(course=self.course.id.course)
         )
-        response_reader = StringIO(response.content)
+        response_reader = six.StringIO(response.content)
         reader = csv.DictReader(response_reader, dialect=csv.excel)
         self.assertEqual(
             reader.fieldnames,