Merge pull request #198 from ainilife/biz

more unit tests
add the test case
Merge branch 'biz' of code.dianpingoa.com:arch/cat into biz
add the testcase
Merge branch 'biz' of https://github.com/dianping/cat into biz
Merge branch 'biz' of ssh://code.dianpingoa.com/arch/cat into biz
add more unit tests