add another regression test with non-zero fill_value
add another regression test with non-zero fill_value

saimn/astropy,dhomeier/astropy,astropy/astropy,stargaser/astropy,StuartLittlefair/astropy,mhvk/astropy,StuartLittlefair/astropy,MSeifert04/astropy,aleksandr-bakanov/astropy,stargaser/astropy,dhomeier/astropy,aleksandr-bakanov/astropy,MSeifert04/astropy,saimn/astropy,mhvk/astropy,pllim/astropy,pllim/astropy,mhvk/astropy,larrybradley/astropy,larrybradley/astropy,StuartLittlefair/astropy,stargaser/astropy,saimn/astropy,astropy/astropy,pllim/astropy,aleksandr-bakanov/astropy,lpsinger/astropy,lpsinger/astropy,StuartLittlefair/astropy,StuartLittlefair/astropy,astropy/astropy,lpsinger/astropy,pllim/astropy,saimn/astropy,lpsinger/astropy,larrybradley/astropy,mhvk/astropy,saimn/astropy,MSeifert04/astropy,MSeifert04/astropy,pllim/astropy,stargaser/astropy,astropy/astropy,dhomeier/astropy,larrybradley/astropy,mhvk/astropy,astropy/astropy,lpsinger/astropy,aleksandr-bakanov/astropy,dhomeier/astropy,larrybradley/astropy,dhomeier/astropy