Added input test and fixed comments
Added input test and fixed comments

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