* The _get_connection method of PersistenceTestMixin should take `self` as the first argument. Change-Id: Ibaaa0d54b408d5e37c6349c63becef919d02fac8
* The _get_connection method of PersistenceTestMixin should take `self` as the first argument. Change-Id: Ibaaa0d54b408d5e37c6349c63becef919d02fac8