BUG: Fix build error from BUILD_TESTING Flag ON
BUG: Fix build error from BUILD_TESTING Flag ON

thewtex/TubeTK,aylward/ITKTubeTK,sumedhasingla/TubeTK,LucasGandel/TubeTK,thewtex/TubeTK,sumedhasingla/TubeTK,thewtex/TubeTK,cdeepakroy/TubeTK,LucasGandel/TubeTK,KitwareMedical/ITKTubeTK,cdeepakroy/TubeTK,KitwareMedical/ITKTubeTK,KitwareMedical/TubeTK,sumedhasingla/TubeTK,KitwareMedical/TubeTK,thewtex/TubeTK,KitwareMedical/TubeTK,aylward/ITKTubeTK,cdeepakroy/TubeTK,KitwareMedical/ITKTubeTK,cdeepakroy/TubeTK,LucasGandel/TubeTK,LucasGandel/TubeTK,KitwareMedical/ITKTubeTK,aylward/ITKTubeTK,aylward/ITKTubeTK,KitwareMedical/TubeTK,sumedhasingla/TubeTK