Merge pull request #11603 from edx/usman/migrations-setup

Update migrations setup during Python unit tests

common/djangoapps/util/db.py

@@ -231,3 +231,16 @@ def generate_int_id(minimum=0, maximum=MYSQL_MAX_INT, used_ids=None):
         cid = random.randint(minimum, maximum)
 
     return cid
+
+
+class NoOpMigrationModules(object):
+    """
+    Return invalid migrations modules for apps. Used for disabling migrations during tests.
+    See https://groups.google.com/d/msg/django-developers/PWPj3etj3-U/kCl6pMsQYYoJ.
+    """
+
+    def __contains__(self, item):
+        return True
+
+    def __getitem__(self, item):
+        return "notmigrations"