tree be457e31580c663528a20419a7d738ca5e9b8741
parent 86038e1c720bc45edc44a61fbc0343579a76a382
author gengchc2 <geng.changcai2@zte.com.cn> 1474531755 +0800
committer gengchc2 <geng.changcai2@zte.com.cn> 1479268444 +0000

Replace assertEqual(None, *) with assertIsNone in tests

Replace assertEqual(None, *) with assertIsNone in tests to
have more clear messages in case of failure.

Change-Id: Ice018dfd3e48326ce9cac58342d03979559b9e82