add a test for parameter setters
add a test for parameter setters

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