tree a080f3def8c72f4ecd0a55b7171771e7483d9787
parent de4203450f9d47df00c12984d10b56f1dc134374
author Haoming Zhang <zhm1993zhm@gmail.com> 1498612617 -0700
committer Haoming Zhang <zhm1993zhm@gmail.com> 1498612617 -0700

add test case