added case for mocking

common/lib/capa/capa/inputtypes.py

@@ -869,7 +869,12 @@ class DragAndDropInput(InputTypeBase):
 
         self.loaded_attributes['drag_and_drop_json'] = json.dumps(to_js)
         self.to_render.add('drag_and_drop_json')
-        self.loaded_attributes['course_folder'] = self.system.course_id.split('/')[1]
+        # import ipdb; ipdb.set_trace()
+        try:  # for tests and mock up, work normally not in tets
+            self.loaded_attributes['course_folder'] = \
+                self.system.course_id.split('/')[1]
+        except:
+            self.loaded_attributes['course_folder'] = 'mock'
         self.to_render.add('course_folder')
 
 registry.register(DragAndDropInput)