Add unittest to to_cpu
Add unittest to to_cpu

cupy/cupy,hvy/chainer,truongdq/chainer,muupan/chainer,ktnyt/chainer,keisuke-umezawa/chainer,ktnyt/chainer,delta2323/chainer,sinhrks/chainer,cupy/cupy,AlpacaDB/chainer,keisuke-umezawa/chainer,sinhrks/chainer,truongdq/chainer,cupy/cupy,kikusu/chainer,niboshi/chainer,ktnyt/chainer,rezoo/chainer,AlpacaDB/chainer,wkentaro/chainer,jnishi/chainer,niboshi/chainer,chainer/chainer,benob/chainer,chainer/chainer,muupan/chainer,cemoody/chainer,t-abe/chainer,ysekky/chainer,jnishi/chainer,anaruse/chainer,t-abe/chainer,aonotas/chainer,niboshi/chainer,okuta/chainer,wkentaro/chainer,okuta/chainer,jnishi/chainer,okuta/chainer,ktnyt/chainer,wkentaro/chainer,keisuke-umezawa/chainer,tkerola/chainer,cupy/cupy,benob/chainer,ronekko/chainer,chainer/chainer,pfnet/chainer,wkentaro/chainer,okuta/chainer,kikusu/chainer,hvy/chainer,niboshi/chainer,kiyukuta/chainer,jnishi/chainer,kashif/chainer,hvy/chainer,keisuke-umezawa/chainer,hvy/chainer,chainer/chainer