Add unittest for random_integers
Add unittest for random_integers

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