Test negative positions
Test negative positions

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