diff --git a/src/swsssdk/configdb.py b/src/swsssdk/configdb.py
index 95aeb2ba..c5bcd8e6 100644
--- a/src/swsssdk/configdb.py
+++ b/src/swsssdk/configdb.py
@@ -55,6 +55,7 @@ def __init__(self, decode_responses=True, **kwargs):
         self.TABLE_NAME_SEPARATOR = '|'
         self.KEY_SEPARATOR = '|'
         self.handlers = {}
+        self.test_cover = ''
 
     def __wait_for_db_init(self):
         client = self.get_redis_client(self.db_name)