Fix toy course textbook test - use Mongo-backed test course.

common/lib/xmodule/xmodule/course_module.py

@@ -175,7 +175,7 @@ class CourseFields(object):
         scope=Scope.settings
     )
     textbooks = TextbookList(
-        help=_("List of pairs of (title, url) for textbooks used in this course"),
+        help=_("List of Textbook objects with (title, url) for textbooks used in this course"),
         default=[],
         scope=Scope.content
     )

common/lib/xmodule/xmodule/modulestore/tests/factories.py

@@ -25,6 +25,7 @@ from xmodule.modulestore import prefer_xmodules, ModuleStoreEnum
 from xmodule.modulestore.tests.sample_courses import default_block_info_tree, TOY_BLOCK_INFO_TREE
 from xmodule.tabs import CourseTab
 from xmodule.x_module import DEPRECATION_VSCOMPAT_EVENT
+from xmodule.course_module import Textbook
 
 
 class Dummy(object):
@@ -190,7 +191,7 @@ class ToyCourseFactory(SampleCourseFactory):
 
         fields = {
             'block_info_tree': TOY_BLOCK_INFO_TREE,
-            'textbooks': [["Textbook", "path/to/a/text_book"]],
+            'textbooks': [Textbook("Textbook", "path/to/a/text_book")],
             'wiki_slug': "toy",
             'graded': True,
             'discussion_topics': {"General": {"id": "i4x-edX-toy-course-2012_Fall"}},