tree e406c6fa3c4499012941e263df5aa5b89a622aaf
parent 01e42ad2c9fc882ab2f84d3f4c73339b7238d99a
author Haoming Zhang <zhm1993zhm@gmail.com> 1501893014 -0700
committer Haoming Zhang <zhm1993zhm@gmail.com> 1502842379 -0700

add tests, fix bugs