Add roundtrip test
Add roundtrip test

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