refactore #process_column tests based on code review
refactore #process_column tests based on code review

-use lets
-use doubles
-fix typos
-ensure correct errors are called

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