check 0 sends means 0 not ignore

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

@@ -266,7 +266,7 @@ def check_mongo_calls(mongo_store, num_finds=0, num_sends=None):
     """
     if mongo_store.get_modulestore_type() == ModuleStoreEnum.Type.mongo:
         with check_exact_number_of_calls(mongo_store.collection, mongo_store.collection.find, num_finds):
-            if num_sends:
+            if num_sends is not None:
                 with check_exact_number_of_calls(
                     mongo_store.database.connection,
                     mongo_store.database.connection._send_message,  # pylint: disable=protected-access
@@ -291,7 +291,7 @@ def check_mongo_calls(mongo_store, num_finds=0, num_sends=None):
                 wrap_patch = patch.object(collection, 'find', find_wrap)
                 wrap_patches.append(wrap_patch)
                 wrap_patch.start()
-            if num_sends:
+            if num_sends is not None:
                 connection = mongo_store.db_connection.database.connection
                 with check_exact_number_of_calls(
                     connection,

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

@@ -859,7 +859,7 @@ class TestMixedModuleStore(unittest.TestCase):
         self.assertEqual(len(self.store.get_courses_for_wiki('edX.simple.2012_Fall')), 0)
         self.assertEqual(len(self.store.get_courses_for_wiki('no_such_wiki')), 0)
 
-    @ddt.data(('draft', 2, 0), ('split', 5, 0))
+    @ddt.data(('draft', 2, 6), ('split', 5, 2))
     @ddt.unpack
     def test_unpublish(self, default_ms, max_find, max_send):
         """