From ec5aee29496899d4c2b01a49af4d28e17b881c52 Mon Sep 17 00:00:00 2001
From: Ned Batchelder <ned@edx.org>
Date: Fri, 6 Jun 2014 13:17:36 -0400
Subject: [PATCH] Remove duplicates in a class list so tests aren't duplicated

---
 lms/djangoapps/courseware/tests/test_module_render.py | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/lms/djangoapps/courseware/tests/test_module_render.py b/lms/djangoapps/courseware/tests/test_module_render.py
index 548a1df152..4f58281c4a 100644
--- a/lms/djangoapps/courseware/tests/test_module_render.py
+++ b/lms/djangoapps/courseware/tests/test_module_render.py
@@ -770,10 +770,11 @@ class TestStaffDebugInfo(ModuleStoreTestCase):
 
 PER_COURSE_ANONYMIZED_DESCRIPTORS = (LTIDescriptor, )
 
-PER_STUDENT_ANONYMIZED_DESCRIPTORS = [
+# The "set" here is to work around the bug that load_classes returns duplicates for multiply-delcared classes.
+PER_STUDENT_ANONYMIZED_DESCRIPTORS = set(
     class_ for (name, class_) in XModuleDescriptor.load_classes()
     if not issubclass(class_, PER_COURSE_ANONYMIZED_DESCRIPTORS)
-]
+)
 
 
 @ddt