add regression test
add regression test

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