diff --git a/test/conftest.py b/test/conftest.py
index 6f3129931452aae167a96ce3105f5bbd42d07956..7a30988bd17365e8ab4f3ed4d8a74e8fcf2d03be 100644
--- a/test/conftest.py
+++ b/test/conftest.py
@@ -132,6 +132,9 @@ class MockedRedis(object):
             return None
         return value.encode('utf-8')
 
+    def exists(self, name):
+        return name in MockedRedis.db
+
     def delete(self, key):
         if isinstance(key, bytes):
             key = key.decode('utf-8')