-Adressed all comments

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

@@ -194,7 +194,7 @@ class TabsPageTests(CourseTestCase):
 
     def test_invalid_course_id(self):
         """ Asserts that Http404 is raised when the course id is not valid. """
-        invalid_tab_url = reverse_course_url('tabs_handler', "/some.invalid.key/TTT/CS01/2015_T0")
+        invalid_tab_url = reverse_course_url('tabs_handler', "/some.invalid.key/course-v1:TTT+CS01+2015_T0")
         with self.assertRaises(Http404):
             self.client.get(invalid_tab_url)
 

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

@@ -320,7 +320,7 @@ class UsersTestCase(CourseTestCase):
     def test_invalid_course_id(self):
         """ Asserts that Http404 is raised when the course id is not valid. """
         wrong_url = reverse_course_url(
-            'course_team_handler', "/some.invalid.key/TTT/CS01/2015_T0",
+            'course_team_handler', "/some.invalid.key/course-v1:TTT+CS01+2015_T0",
             kwargs={'email': self.ext_user.email}
         )
         with self.assertRaises(Http404):

common/djangoapps/util/tests/test_course_key_utils.py

 """
 Tests for util.course_key_utils
 """
+import ddt
+import unittest
 from util.course_key_utils import course_key_from_string_or_404
 from opaque_keys.edx.keys import CourseKey
 from django.http import Http404
-import ddt
-import unittest
 
 
 @ddt.ddt
@@ -21,7 +21,6 @@ class TestFromStringOr404(unittest.TestCase):
         """
         Tests course_key_from_string_or_404 for valid split style course keys and mongo style course keys.
         """
-        from nose.tools import set_trace ; set_trace()
         self.assertEquals(
             CourseKey.from_string(valid_course_key),
             course_key_from_string_or_404(valid_course_key)