updated NDData tests
updated NDData tests

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