add additional regression test
add additional regression test

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