Add test for CompImageHDU
Add test for CompImageHDU

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