Add more tests for test_objects.py
Add more tests for test_objects.py

Implements part of bp increase-test-coverage

Change-Id: I9a935e56e92017e46813e0633c9aaae038763a2a

Alzon/SUR,Tennyson53/magnum,Tennyson53/SUR,hongbin/magnum,ddepaoli3/magnum,openstack/magnum,mjbrewer/testindex,dimtruck/magnum,dimtruck/magnum,jay-lau/magnum,sajuptpm/magnum,ffantast/magnum,mjbrewer/testindex,eshijia/magnum,annegentle/magnum,ArchiFleKs/magnum,paulczar/magnum,Alzon/SUR,LaynePeng/magnum,Tennyson53/SUR,eshijia/magnum,mjbrewer/testindex,ramielrowe/magnum,LaynePeng/magnum,ChengTiesheng/magnum,ArchiFleKs/magnum,sajuptpm/magnum,annegentle/magnum,ffantast/magnum,eshijia/SUR,paulczar/magnum,ddepaoli3/magnum,openstack/magnum,hongbin/magnum,Tennyson53/magnum,ChengTiesheng/magnum,ramielrowe/magnum,eshijia/SUR