Add code coverage.
Add code coverage.

overtrue/wechat,tianyong90/wechat,allen05ren/wechat,soone/wechat,acgrid/wechat,sunmingyang/wechat,overtrue/wechat,soone/wechat,lichunqiang/wechat,ac1982/wechat,lichunqiang/wechat,sunmingyang/wechat,hareluya/wechat,allen05ren/wechat,acgrid/wechat,ac1982/wechat,tianyong90/wechat