modified a test to test slicing of naxis attribute
modified a test to test slicing of naxis attribute

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