fix race condition in test
fix race condition in test

chengduoZH/Paddle,PaddlePaddle/Paddle,hedaoyuan/Paddle,tensor-tang/Paddle,Canpio/Paddle,yu239/Paddle,baidu/Paddle,reyoung/Paddle,baidu/Paddle,tensor-tang/Paddle,yu239/Paddle,hedaoyuan/Paddle,putcn/Paddle,jacquesqiao/Paddle,putcn/Paddle,lcy-seso/Paddle,chengduoZH/Paddle,lcy-seso/Paddle,chengduoZH/Paddle,lispc/Paddle,pkuyym/Paddle,QiJune/Paddle,lispc/Paddle,luotao1/Paddle,luotao1/Paddle,lispc/Paddle,putcn/Paddle,yu239/Paddle,reyoung/Paddle,pengli09/Paddle,pengli09/Paddle,jacquesqiao/Paddle,luotao1/Paddle,reyoung/Paddle,QiJune/Paddle,QiJune/Paddle,jacquesqiao/Paddle,PaddlePaddle/Paddle,pengli09/Paddle,hedaoyuan/Paddle,jacquesqiao/Paddle,baidu/Paddle,pengli09/Paddle,tensor-tang/Paddle,lcy-seso/Paddle,hedaoyuan/Paddle,pkuyym/Paddle,QiJune/Paddle,Canpio/Paddle,PaddlePaddle/Paddle,lcy-seso/Paddle,luotao1/Paddle,QiJune/Paddle,Canpio/Paddle,hedaoyuan/Paddle,baidu/Paddle,Canpio/Paddle,reyoung/Paddle,pkuyym/Paddle,PaddlePaddle/Paddle,pengli09/Paddle,yu239/Paddle,baidu/Paddle,hedaoyuan/Paddle,pkuyym/Paddle,yu239/Paddle,tensor-tang/Paddle,Canpio/Paddle,hedaoyuan/Paddle,lispc/Paddle,lcy-seso/Paddle,pengli09/Paddle,tensor-tang/Paddle,chengduoZH/Paddle,lcy-seso/Paddle,pengli09/Paddle,Canpio/Paddle,luotao1/Paddle,lispc/Paddle,lispc/Paddle,pengli09/Paddle,luotao1/Paddle,luotao1/Paddle,QiJune/Paddle,pkuyym/Paddle,jacquesqiao/Paddle,lispc/Paddle,yu239/Paddle,putcn/Paddle,jacquesqiao/Paddle,reyoung/Paddle,pkuyym/Paddle,PaddlePaddle/Paddle,yu239/Paddle,putcn/Paddle,PaddlePaddle/Paddle,PaddlePaddle/Paddle,Canpio/Paddle,lispc/Paddle,Canpio/Paddle,chengduoZH/Paddle,reyoung/Paddle,putcn/Paddle,yu239/Paddle,hedaoyuan/Paddle