added a test where instantiation fails
added a test where instantiation fails

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