Add tests for new feature
Add tests for new feature

jbenet/go-logging,yangzhao28/go-logging,ckeyer/go-log,op/go-logging,zj8487/go-logging,mousesun/go-logging,s-kostyaev/go-logging,nporsche/np-golang-logging,alecthomas/go-logging,giftig/go-logging,d-ulyanov/go-logging,shell909090/go-logging