extend test_manifestloader slightly
extend test_manifestloader slightly

hughperkins/DeepCL,hughperkins/DeepCL,MiniLight/DeepCL,MiniLight/DeepCL,hughperkins/DeepCL,hughperkins/DeepCL,MiniLight/DeepCL,MiniLight/DeepCL,MiniLight/DeepCL,hughperkins/DeepCL