added regression test
added regression test

lpsinger/astropy,joergdietrich/astropy,funbaker/astropy,lpsinger/astropy,StuartLittlefair/astropy,kelle/astropy,stargaser/astropy,pllim/astropy,tbabej/astropy,mhvk/astropy,tbabej/astropy,bsipocz/astropy,DougBurke/astropy,mhvk/astropy,larrybradley/astropy,astropy/astropy,saimn/astropy,funbaker/astropy,kelle/astropy,tbabej/astropy,kelle/astropy,StuartLittlefair/astropy,mhvk/astropy,AustereCuriosity/astropy,pllim/astropy,astropy/astropy,aleksandr-bakanov/astropy,bsipocz/astropy,pllim/astropy,tbabej/astropy,dhomeier/astropy,astropy/astropy,lpsinger/astropy,AustereCuriosity/astropy,MSeifert04/astropy,saimn/astropy,larrybradley/astropy,lpsinger/astropy,stargaser/astropy,aleksandr-bakanov/astropy,funbaker/astropy,AustereCuriosity/astropy,dhomeier/astropy,dhomeier/astropy,MSeifert04/astropy,larrybradley/astropy,lpsinger/astropy,pllim/astropy,joergdietrich/astropy,mhvk/astropy,aleksandr-bakanov/astropy,saimn/astropy,mhvk/astropy,larrybradley/astropy,dhomeier/astropy,bsipocz/astropy,StuartLittlefair/astropy,AustereCuriosity/astropy,joergdietrich/astropy,astropy/astropy,DougBurke/astropy,DougBurke/astropy,dhomeier/astropy,larrybradley/astropy,MSeifert04/astropy,saimn/astropy,StuartLittlefair/astropy,joergdietrich/astropy,tbabej/astropy,stargaser/astropy,AustereCuriosity/astropy,StuartLittlefair/astropy,saimn/astropy,stargaser/astropy,kelle/astropy,bsipocz/astropy,funbaker/astropy,joergdietrich/astropy,kelle/astropy,MSeifert04/astropy,pllim/astropy,aleksandr-bakanov/astropy,astropy/astropy,DougBurke/astropy