tree 1890014254fe21354168e211a352afc50c0a6b14
parent 5d74daf0645d4de0d25be5275d3d58cd3faf4d94
author Haoming Zhang <zhm1993zhm@gmail.com> 1498674471 -0700
committer Haoming Zhang <zhm1993zhm@gmail.com> 1498674471 -0700

add test cases