Don't add groups in experiment configurations twice.

EDUCATOR-947

cms/djangoapps/contentstore/views/course.py

@@ -1547,22 +1547,27 @@ def group_configurations_list_handler(request, course_key_string):
 
             all_partitions = GroupConfiguration.get_all_user_partition_details(store, course)
             should_show_enrollment_track = False
-            group_schemes = []
+            has_content_groups = False
+            displayable_partitions = []
             for partition in all_partitions:
-                group_schemes.append(partition['scheme'])
-                if partition['scheme'] == ENROLLMENT_SCHEME:
-                    enrollment_track_configuration = partition
-                    should_show_enrollment_track = len(enrollment_track_configuration['groups']) > 1
+                if partition['scheme'] == COHORT_SCHEME:
+                    has_content_groups = True
+                    displayable_partitions.append(partition)
+                elif partition['scheme'] == ENROLLMENT_SCHEME:
+                    should_show_enrollment_track = len(partition['groups']) > 1
 
-                    # Remove the enrollment track partition and add it to the front of the list if it should be shown.
-                    all_partitions.remove(partition)
+                    # Add it to the front of the list if it should be shown.
                     if should_show_enrollment_track:
-                        all_partitions.insert(0, partition)
+                        displayable_partitions.insert(0, partition)
+                elif partition['scheme'] != RANDOM_SCHEME:
+                    # Experiment group configurations are handled explicitly above. We don't
+                    # want to display their groups twice.
+                    displayable_partitions.append(partition)
 
             # Add empty content group if there is no COHORT User Partition in the list.
             # This will add ability to add new groups in the view.
-            if COHORT_SCHEME not in group_schemes:
-                all_partitions.append(GroupConfiguration.get_or_create_content_group(store, course))
+            if not has_content_groups:
+                displayable_partitions.append(GroupConfiguration.get_or_create_content_group(store, course))
 
             return render_to_response('group_configurations.html', {
                 'context_course': course,
@@ -1570,7 +1575,7 @@ def group_configurations_list_handler(request, course_key_string):
                 'course_outline_url': course_outline_url,
                 'experiment_group_configurations': experiment_group_configurations,
                 'should_show_experiment_groups': should_show_experiment_groups,
-                'all_group_configurations': all_partitions,
+                'all_group_configurations': displayable_partitions,
                 'should_show_enrollment_track': should_show_enrollment_track
             })
         elif "application/json" in request.META.get('HTTP_ACCEPT'):

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

@@ -250,6 +250,7 @@ class GroupConfigurationsListHandlerTestCase(CourseTestCase, GroupConfigurations
         Basic check that the groups configuration page responds correctly.
         """
 
+        # This creates a random UserPartition.
         self.course.user_partitions = [
             UserPartition(0, 'First name', 'First description', [Group(0, 'Group A'), Group(1, 'Group B'), Group(2, 'Group C')]),
         ]
@@ -261,7 +262,7 @@ class GroupConfigurationsListHandlerTestCase(CourseTestCase, GroupConfigurations
 
         response = self.client.get(self._url())
         self.assertEqual(response.status_code, 200)
-        self.assertContains(response, 'First name')
+        self.assertContains(response, 'First name', count=1)
         self.assertContains(response, 'Group C')
         self.assertContains(response, CONTENT_GROUP_CONFIGURATION_NAME)