diff --git a/cms/djangoapps/contentstore/views/tests/test_item.py b/cms/djangoapps/contentstore/views/tests/test_item.py
index ec4822d46e..bb55cb39aa 100644
--- a/cms/djangoapps/contentstore/views/tests/test_item.py
+++ b/cms/djangoapps/contentstore/views/tests/test_item.py
@@ -25,7 +25,7 @@ from student.tests.factories import UserFactory
 from xmodule.capa_module import CapaDescriptor
 from xmodule.modulestore import ModuleStoreEnum
 from xmodule.modulestore.django import modulestore
-from xmodule.modulestore.tests.django_utils import ModuleStoreTestCase
+from xmodule.modulestore.tests.django_utils import ModuleStoreTestCase, TEST_DATA_SPLIT_MODULESTORE
 from xmodule.modulestore.tests.factories import ItemFactory, LibraryFactory, check_mongo_calls
 from xmodule.x_module import STUDIO_VIEW, STUDENT_VIEW
 from xblock.exceptions import NoSuchHandlerError
@@ -558,13 +558,13 @@ class TestDuplicateItem(ItemTest):
         return self.response_usage_key(resp)
 
 
-class TestEditItem(ItemTest):
+class TestEditItemSetup(ItemTest):
     """
-    Test xblock update.
+    Setup for xblock update tests.
     """
     def setUp(self):
         """ Creates the test course structure and a couple problems to 'edit'. """
-        super(TestEditItem, self).setUp()
+        super(TestEditItemSetup, self).setUp()
         # create a chapter
         display_name = 'chapter created'
         resp = self.create_xblock(display_name=display_name, category='chapter')
@@ -587,6 +587,11 @@ class TestEditItem(ItemTest):
 
         self.course_update_url = reverse_usage_url("xblock_handler", self.usage_key)
 
+
+class TestEditItem(TestEditItemSetup):
+    """
+    Test xblock update.
+    """
     def test_delete_field(self):
         """
         Sending null in for a field 'deletes' it
@@ -1004,6 +1009,26 @@ class TestEditItem(ItemTest):
         self.assertIn("Incorrect RelativeTime value", parsed["error"])  # See xmodule/fields.py
 
 
+class TestEditItemSplitMongo(TestEditItemSetup):
+    """
+    Tests for EditItem running on top of the SplitMongoModuleStore.
+    """
+    MODULESTORE = TEST_DATA_SPLIT_MODULESTORE
+
+    def test_editing_view_wrappers(self):
+        """
+        Verify that the editing view only generates a single wrapper, no matter how many times it's loaded
+
+        Exposes: PLAT-417
+        """
+        view_url = reverse_usage_url("xblock_view_handler", self.problem_usage_key, {"view_name": STUDIO_VIEW})
+
+        for __ in xrange(3):
+            resp = self.client.get(view_url, HTTP_ACCEPT='application/json')
+            self.assertEqual(resp.status_code, 200)
+            self.assertEqual(resp.content.count('xblock-{}'.format(STUDIO_VIEW)), 1)
+
+
 class TestEditSplitModule(ItemTest):
     """
     Tests around editing instances of the split_test module.
diff --git a/common/lib/xmodule/xmodule/modulestore/tests/django_utils.py b/common/lib/xmodule/xmodule/modulestore/tests/django_utils.py
index 7418c86b07..ab9cc62b6e 100644
--- a/common/lib/xmodule/xmodule/modulestore/tests/django_utils.py
+++ b/common/lib/xmodule/xmodule/modulestore/tests/django_utils.py
@@ -24,7 +24,12 @@ from xmodule.modulestore.tests.factories import XMODULE_FACTORY_LOCK
 from xmodule.tabs import CoursewareTab, CourseInfoTab, StaticTab, DiscussionTab, ProgressTab, WikiTab
 
 
-def mixed_store_config(data_dir, mappings, include_xml=False, xml_course_dirs=None):
+class StoreConstructors(object):
+    """Enumeration of store constructor types."""
+    draft, split, xml = range(3)
+
+
+def mixed_store_config(data_dir, mappings, include_xml=False, xml_course_dirs=None, store_order=None):
     """
     Return a `MixedModuleStore` configuration, which provides
     access to both Mongo- and XML-backed courses.
@@ -53,20 +58,24 @@ def mixed_store_config(data_dir, mappings, include_xml=False, xml_course_dirs=No
             * mappings should be configured, pointing the xml courses to the xml modulestore
 
     """
-    stores = [
-        draft_mongo_store_config(data_dir)['default'],
-        split_mongo_store_config(data_dir)['default']
-    ]
+    if store_order is None:
+        store_order = [StoreConstructors.draft, StoreConstructors.split]
 
-    if include_xml:
-        stores.append(xml_store_config(data_dir, course_dirs=xml_course_dirs)['default'])
+    if include_xml and StoreConstructors.xml not in store_order:
+        store_order.append(StoreConstructors.xml)
+
+    store_constructors = {
+        StoreConstructors.split: split_mongo_store_config(data_dir)['default'],
+        StoreConstructors.draft: draft_mongo_store_config(data_dir)['default'],
+        StoreConstructors.xml: xml_store_config(data_dir, course_dirs=xml_course_dirs)['default'],
+    }
 
     store = {
         'default': {
             'ENGINE': 'xmodule.modulestore.mixed.MixedModuleStore',
             'OPTIONS': {
                 'mappings': mappings,
-                'stores': stores,
+                'stores': [store_constructors[store] for store in store_order],
             }
         }
     }
@@ -177,6 +186,16 @@ TEST_DATA_MIXED_GRADED_MODULESTORE = mixed_store_config(
 # This modulestore definition below will not load any xml courses.
 TEST_DATA_MONGO_MODULESTORE = mixed_store_config(mkdtemp(), {}, include_xml=False)
 
+# All store requests now go through mixed
+# Use this modulestore if you specifically want to test split-mongo and not a mocked modulestore.
+# This modulestore definition below will not load any xml courses.
+TEST_DATA_SPLIT_MODULESTORE = mixed_store_config(
+    mkdtemp(),
+    {},
+    include_xml=False,
+    store_order=[StoreConstructors.split, StoreConstructors.draft]
+)
+
 # Unit tests that are not specifically testing the modulestore implementation but just need course context can use a mocked modulestore.
 # Use this modulestore if you do not care about the underlying implementation.
 # TODO: acutally mock out the modulestore for this in a subsequent PR.