QPID-5156: check node properties on assert

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1525858 13f79535-47bb-0310-9956-ffa450edef68
QPID-5156: add tests for assert functionality

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1525859 13f79535-47bb-0310-9956-ffa450edef68