From bf882dd8970dc6ce05827f3c90107a5285c2a943 Mon Sep 17 00:00:00 2001
From: Monty Taylor <mordred@inaugust.com>
Date: Thu, 13 Oct 2016 16:22:44 -0500
Subject: [PATCH] Default serialize_with to json

None is not a valid value to pass to serialize_with for betamax. The
default value in the betamax library is 'json' - so just use that.

Change-Id: I714b02e568121ead5c81ab72bb0df27d8fc17337
---
 keystoneauth1/fixture/keystoneauth_betamax.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/keystoneauth1/fixture/keystoneauth_betamax.py b/keystoneauth1/fixture/keystoneauth_betamax.py
index c47efb5e..f2c2b5c4 100644
--- a/keystoneauth1/fixture/keystoneauth_betamax.py
+++ b/keystoneauth1/fixture/keystoneauth_betamax.py
@@ -57,7 +57,7 @@ def _construct_session_with_betamax(fixture, session_obj=None):
         session_obj, cassette_library_dir=fixture.cassette_library_dir)
 
     record = 'none'
-    serializer = None
+    serializer = 'json'
 
     if fixture.record:
         record = 'all'