refactor of osra_num tests
refactor of osra_num tests

part of PT story https://www.pivotaltracker.com/story/show/75999516

b264/osra,jmorcate/osra,gmunumel/osra,b264/osra,robbiejackson/osra,SergiosLen/osra,ZmagoD/osra,guangfanxu/osra,razorcd/osra,gmunumel/osra,evo2013/osra,NikitaAvvakumov/osra,b264/osra,razorcd/osra,NikitaAvvakumov/osra,motasem-salem/osra,gmunumel/osra,SergiosLen/osra,ZmagoD/osra,AgileVentures/osra,PurityControl/osra,guangfanxu/osra,evo2013/osra,PurityControl/osra,jmorcate/osra,SergiosLen/osra,razorcd/osra,AgileVentures/osra,robbiejackson/osra,motasem-salem/osra,guangfanxu/osra,motasem-salem/osra,robbiejackson/osra,AgileVentures/osra,ZmagoD/osra,NikitaAvvakumov/osra,jmorcate/osra,PurityControl/osra