another assert to show that we're requesting the last offset we know if.
another assert to show that we're requesting the last offset we know if.

yungchin/pykafka,thedrow/samsa,sontek/pykafka,vortec/pykafka,jofusa/pykafka,sammerry/pykafka,tempbottle/pykafka,benauthor/pykafka,tempbottle/pykafka,fortime/pykafka,wikimedia/operations-debs-python-pykafka,sontek/pykafka,yungchin/pykafka,appsoma/pykafka,benauthor/pykafka,aeroevan/pykafka,thedrow/samsa,wikimedia/operations-debs-python-pykafka,wikimedia/operations-debs-python-pykafka,appsoma/pykafka,vortec/pykafka,jofusa/pykafka,benauthor/pykafka,aeroevan/pykafka,fortime/pykafka,sammerry/pykafka,thedrow/samsa