def test_delete_healthmonitor_cascade_deletion_of_associations(self):
    transaction = ctx.session.begin(subtransactions=True)
    try:
        # create a pool and a health monitor bound together
        pool_info = {
            'id': uuidutils.generate_uuid(),
            'name': 'test_pool',
            'description': 'test_pool',
            'subnet_id': self._subnet_id,
            'tenant_id': self._tenant_id,
            'protocol': 'TCP',
            'lb_method': 'ROUND_ROBIN',
            'admin_state_up': True,
            'status': constants.PENDING_CREATE
        }
        pool = ldb.Pool(**pool_info)
        ctx.session.add(pool)

        monitor_info = {
            'id': uuidutils.generate_uuid(),
            'tenant_id': self._tenant_id,
            'type': 'PING',
            'delay': 30,
            'max_retries': 10,
            'timeout': 5,
            'admin_state_up': True,
            'status': constants.PENDING_CREATE
        }
        monitor = ldb.HealthMonitor(**monitor_info)
        ctx.session.add(monitor)
        ctx.session.flush()

        assoc = ldb.PoolMonitorAssociation(pool_id=pool.id,
                                           monitor_id=monitor.id)
        ctx.session.add(assoc)
        ctx.session.flush()

        # check if all Pool associations have been deleted by cascade
        self.plugin.delete_health_monitor(ctx, monitor.id)
        
        qry = ctx.session.query(ldb.PoolMonitorAssociation)
        qry = qry.filter_by(monitor_id=monitor.id)
        self.assertFalse(qry.all())
    finally:
        transaction.rollback()