+ raise RuntimeError('Traffic loss occurred: {0}'.format(self._loss))
+
+ def fail_if_no_traffic_forwarded(self):
+ """Fail if no traffic forwarded.
+
+ :returns: nothing
+ :raises Exception: If no traffic forwarded.
+ """
+ if self._received is None:
+ raise RuntimeError('The traffic generation has not been issued')
+ if self._received == '0':
+ raise RuntimeError('No traffic forwarded')