Add test for logging capture.
Add test for logging capture.

pki-io/testify,bmatsuo/testify,MCProHosting/testify,ernesto-jimenez/testify,liudhzhyym/testify,insionng/testify,ifraixedes/testify,danielchatfield/testify,mesosphere/testify,yxd-hde/testify,wallclockbuilder/testify,irnnr/testify,yaoshipu/testify,AnuchitPrasertsang/testify,multiplay/testify,yxd-hde/testify,hpcloud/testify,brahmaroutu/testify,hawx/assert,csquared/testify,Fiery/testify,betable/testify,stretchr/testify,dvln/testify,grepory/testify,allgeek/testify,andymoon/testify,outrightmental/go-testify,glittershark/testify,roth1002/testify,stretchr/testify,davelondon/ktest,codygibb/testify,ANPez/testify,embroker/testify